scispace - formally typeset
Search or ask a question

Showing papers on "Continuous phase modulation published in 1991"


Book ChapterDOI
TL;DR: The Gibbs-Duhem integration method as discussed by the authors traces out a two-phase coexistence curve, once one point on that curve is known and the chemical potential of a given species in a single Monte Carlo (MC) or Molecular Dynamics (MD) simulation is known.
Abstract: The techniques that can be used to study phase diagrams numerically depend on the character of the phase transitions In particular, there is quite a difference among the tools used to study first-order phase transitions and those applied to analyze critical phenomena near continuous phase transitions The most straightforward way to study phase behavior by computer simulation is to change the temperature or pressure of a given model system and then to simply wait for a phase transformation to occur There exist several schemes to study phase coexistence without creating an interface In fluids, the best-known method is the Gibbs ensemble method A direct method for studying phase coexistence that does not suffer from this drawback is the so-called Gibbs-Duhem integration method This method is designed to trace out a two-phase coexistence curve, once one point on that curve is known There exist several techniques for measuring the chemical potential of a given species in a single Monte Carlo (MC) or Molecular Dynamics (MD) simulation A particularly simple and elegant method for measuring the chemical potential μ of a species in a pure fluid or in a mixture is the particle insertion method

160 citations


Journal ArticleDOI
TL;DR: An overview of recent advances in constant envelope combined coding and modulation is given, and concatenations of phase codes and convolutional codes are examined.
Abstract: An overview is given of recent advances in constant envelope combined coding and modulation. Modulation codes and trellises are discussed, and major classes of trellis modulation codes are described. Continuous phase modulation is defined, and concatenations of phase codes and convolutional codes are examined. The ultimate capability of phase modulation coding and the size of CPM trellis codes are addressed. Implementation issues are considered. >

84 citations


Journal ArticleDOI
Arne Svensson1
01 Aug 1991
TL;DR: In this article, a reduced state sequence detector (RSSD) was proposed for continuous phase modulation (CPM) with decision feedback and Viterbi decoding, which can be used for both binary and high-level partial response CPM schemes.
Abstract: A reduced state sequence detector (RSSD) which combines decision feedback with Viterbi decoding is proposed for partial response continuous phase modulation (CPM). This detector can successfully be used for both binary and high-level partial response CPM schemes. This detector is analysed by means of minimum Euclidean distance and by simulations of the symbol error probability. It is shown that the phase states in the receiver trellis of the maximum likelihood detector for partial response CPM can be exchanged by decision feedback in the metric calculations. This can be achieved without sacrificing minimum Euclidean distance of the first error event or symbol error probability. This RSSD is most attractive for narrow-band CPM schemes and at most about 2 dB in increased energy efficiency as compared with MSK is possible. Further reductions in number of states is possible, especially for high-level CPM schemes, by reducing the number of correlative states. For the most frequently used CPM schemes this can be done with a very small degradation in error performance. In this class of schemes, a complexity reduction of at least a factor five to ten is possible.

81 citations


Patent
05 Mar 1991
TL;DR: In this article, a method of energy-reducing waveform shaping of carrier signals in a photo-lethysmographic system, in which a carrier signal may comprise a time-varying peri-odic waveform comprising a sum of carrier components, was proposed.
Abstract: Photoplethysmographics Using Energy-Reducing Waveform Shaping Abstract A method of energy-reducing waveform shaping of carrier signals in a photolethysmographic system, in which a carrier signal may comprise a time-varying peri-odic waveform comprising a sum of carrier components. The carrier signal has its energy reduced by adding additional carrier components, which reduce the energy envelope for a period of the carrier signal, while preserving the sig-nal information. The method of energy-reducing waveform shaping may be coupled with frequency-division multiplexing, and more generally with any method of multiplexing which employs a time-varying periodic carrier signal. Redundant information may be used for error detection and correc-tion. A plurality of carrier components may be chosen which reduces the energy envelope for a period of the car-rier signal, and which employs more carrier components than needed to perform the preferred form of multiplexing and demultiplexing of the modulation effects introduced by a tissue section of the patient. Majority voting of car-rier components may then provide for error detection and correction.

65 citations


Journal ArticleDOI
TL;DR: In this article, the effects of stimulated Brillouin scattering (SBS) on the modulated signals in optical fibers are studied for CPFSK, amplitude shift keying (ASK), and PSK.
Abstract: Transmission limitations imposed by stimulated Brillouin scattering (SBS) are investigated for repeaterless coherent lightwave systems, particularly for continuous phase-shift keying (CPFSK). The effects of SBS on the modulated signals in optical fibers are studied for CPFSK, amplitude shift keying (ASK), and phase shift keying (PSK). A generalized model based on the maximum power spectrum density (PSD) in the modulated signals is proposed for SBS analysis. This model is useful to estimate the Brillouin gain and its threshold to determine the optical power limitation of the fiber for any modulated signal with non-negligible linewidth. It is clarified theoretically that the Brillouin gain with CPFSK approaches that with ASK and PSK at higher bit rates if the modulation index is 1 and 0.65, respectively. The dependency of Brillouin gain on bit rate and linewidth of a laser diode transmitter are evaluated. SBS induced by CPFSK modulated signals was measured to clarify the modulation condition dependences and to verify the model. >

47 citations


Journal ArticleDOI
TL;DR: Numerical results indicate that nonlinear CPFSK signals can achieve attractive minimum distances compared with other existing CPM signaling formats.
Abstract: A novel signal-space coded CPM (continuous phase modulated) signaling technique, called nonlinear CPFSK (continuous phase frequency shift keying) signaling, which guarantees the maximum constraint length allowed by the number of states is introduced. Nonlinear CPFSK signals use a suitably selected state transition matrix during all signaling intervals. The selected state transition matrix is realized by changing the modulation index of the signals, hence the modulation index used during any interval depends on the transmitted symbol as well as on the state of the system. Binary nonlinear CPFSK signaling schemes are constructed and analyzed. Numerical results indicate that nonlinear CPFSK signals can achieve attractive minimum distances compared with other existing CPM signaling formats. >

32 citations


Journal ArticleDOI
TL;DR: The authors consider a communication scheme based on continuous phase modulated signals used in conjunction with trellis-coded modulation (TCM) for transmission over a channel affected by Gaussian noise and fading, which provides a power saving and a reduced bandwidth occupancy due to the features of CPM signals.
Abstract: The authors consider a communication scheme based on continuous phase modulated (CPM) signals used in conjunction with trellis-coded modulation (TCM) for transmission over a channel affected by Gaussian noise and fading. This scheme provides a power saving due to the coding gain of TCM and a reduced bandwidth occupancy due to the features of CPM signals. Moreover, CPM provides constant-envelope signals. To keep the complexity of the receiver manageable and to be able to use interleaving/deinterleaving techniques to spread the fade bursts, suboptimal detection schemes must be used. Two such schemes, based on coherent and noncoherent detection of CPM, are considered. Their performance is evaluated by computing the computational cutoff rate of the discrete channel generated by CPM. >

25 citations


Journal ArticleDOI
TL;DR: In this article, a rigorous bit error rate analysis appropriate to continuous phase frequency shift keying (CP-FSK) coherent optical receivers with delay demodulation and an integrating IF filter with integration time less than or equal to the delay time is presented.
Abstract: Reported is a rigorous bit error rate analysis appropriate to continuous phase frequency shift keying (CP-FSK) coherent optical receivers with delay demodulation and an integrating IF filter with integration time less than or equal to the delay time. For an integration time equal to the delay time the model is extended to two optical channels. An important result of the analysis is that IF filtering for CP-FSK modulation reduces the phase swing due to modulation at the detector and this leads to a degradation in system performance with regard to phase noise, receiver noise, and crosstalk influence. For a modulation index of 0.5, for a single optical channel a minimum 2.4-dB penalty relative to matched filter detection is found. The required channel separation for CP-FSK systems appears to be significantly larger than for differential phase shift keying systems and phase noise enhances this effect. >

17 citations


Patent
Glenn M. Head1
20 Dec 1991
TL;DR: In this article, an improved asymmetrical data tracking digital phase locked loop including separate baud rate counters for both the positive data pulse edge and the negative data pulses edge is presented, which provides a data clock pulse located at the midpoint between the corresponding data pulse edges.
Abstract: An improved asymmetrical data tracking digital phase locked loop including separate baud rate counters for both the positive data pulse edge and the negative data pulse edge. The outputs of the two independent baud rate counters are added together and divided by two in a virtual counter for each local oscillator clock cycle. This provides a data clock pulse located at the midpoint between the corresponding data pulse edges as defined by the two baud rate counters. A digital filter is utilized to dampen the tracking loop correction to reduce maximum phase errors by not allowing continuous phase corrections.

17 citations


Journal ArticleDOI
TL;DR: It is shown that performance degradation with respect to that of the differential binary phase shift keying (BPSK) system is due to inherent ISI contained in the signal and also to noise enhancement and correlation caused by the receiver filter.
Abstract: The performance of binary partial response continuous phase modulation (with index 0.5) using a differentially coherent receiver depends on the choice of the receiver filter. An optimum MMSE design method for this filter is presented. The receiver filter is equivalent to the cascade of a matched filter and an equalizer in order to reduce inherent intersymbol interference (ISI). It is shown that performance degradation with respect to that of the differential binary phase shift keying (BPSK) system is due to inherent ISI contained in the signal and also to noise enhancement and correlation caused by the receiver filter. The bit error probability on the Gaussian channel is calculated by assuming that ISI is Gaussian. The Gaussian minimum shift keying (MSK) signal is used for illustration. >

14 citations


Journal ArticleDOI
TL;DR: In this paper, the authors compared the performance of continuous phase frequency shift keying (CPFSK) signal demodulation for phase and polarization diversity receivers: single filter, dual filter, delay and multiply.
Abstract: The following methods of continuous phase frequency shift keying (CPFSK) signal demodulation are compared for phase and polarization diversity receivers: single filter, dual filter, delay and multiply. Bit error rate (BER) values are obtained in each case showing that for negligible laser linewidths the delay demodulation method outperforms the dual-filter method by approximately 3 dB, and the single-filter method by 6 dB. Since the noise bandwidth for minimum-shift keying (MSK) and delay demodulation is approximately twice as small as for the other methods, one should add another 3 dB to get the gain for that modulation/demodulation method. The influences of nonzero laser linewidth, noise correlation, and the nonGaussian character of the probability density functions of the noise at the sampler are taken into account. >

Journal ArticleDOI
TL;DR: In this article, the symbol timing tracking problem for a class of continuous phase modulation (CPM) schemes transmitted over unfaded and fast flat-fading channels is studied, and a particular symbol synchronizer structure that constructs a tone at the symbol frequency by passing the received signal through an Mth power law nonlinearity and multiband filter followed by a squared-envelope nonlinearities and narrowband filter is proposed.
Abstract: The symbol timing tracking problem for a class of continuous phase modulation (CPM) schemes transmitted over unfaded and fast flat-fading channels is studied. The specific family of CPM considered is that of M-ary continuous-phase modulation with a modulation index of h=1/M. A particular symbol synchronizer structure that constructs a tone at the symbol frequency by passing the received signal through an Mth power law nonlinearity and multiband filter followed by a squared-envelope nonlinearity and narrowband filter is proposed. The operation and parameters of this symbol synchronizer are discussed as well as the performance of the synchronizer. Simulation results giving the root-mean-square timing jitter of this system for several binary, quaternary and 8-ary instances of modulation using rectangular, raised-cosine, truncated Nyquist III, and truncated tamed FM pulse shapes are presented to illustrate the synchronizer performance. >

Journal ArticleDOI
01 Oct 1991
TL;DR: In this article, a symbol-by-symbol (SBS) receiver was proposed to partially remove the effects of the destructive intersymbol interference (ISI) which corrupts the differentially detected CECPM signal.
Abstract: We generalise a differential detection technique, introduced elsewhere for a Gaussian minimum shift keying (GMSK) scheme, to include any correlative encoded continuous phase modulated (CECPM) signalling format. The proposed symbol-by-symbol receivers employ decision feedback to partially remove the effects of the destructive intersymbol interference (ISI) which corrupts the differentially detected CECPM signal. After achieving wider eye opening with the decision feedback, the outputs of the two or more differential detectors are jointly utilised to further improve the performance. As a typical example of the CECPM family of signals and because of its excellent spectral characteristics, the new receiver configurations employing up to 3-bit differential detectors have been applied to a tamed frequency modulation (TEM) signal. Bit error rate (BER) performance evaluation results have indicated that performance improvements of more than 5 dB (at BER = 10-4) over a conventionally differential detected TFM scheme are possible. As compared with a limiter/discriminator receiver employing maximum likelihood sequence estimation (MLSE), the proposed receivers offer gains of more than 2 dB(at BER = 10 -4).

Journal ArticleDOI
TL;DR: In this article, the authors proposed a delay-line demodulation method to convert the received AMI-CPFSK signal into the non-return to zero (NRZ) baseband signal without the use of an AMI decoder.
Abstract: Alternate-mark-inversion (AMI) optical continuous phase (CP) frequency-shift keying (FSK) heterodyne transmission using delay-line demodulation which has a higher receiver sensitivity compared to the transmission using single-filter demodulation has been achieved. Since the proposed delay-line demodulation method directly converts the received AMI-CPFSK signal into the nonreturn to zero (NRZ) baseband signal without the use of an AMI decoder, a heterodyne receiver with the same configuration as the conventional CPFSK transmission system is realized, even though AMI line coding is applied to the system. Transmission experiments at 622 Mb/s have been demonstrated for both pseudorandom 2/sup 7/-1 and 2/sup 23/-1-b patterns at the same receiver sensitivity of -41.1 dBm (the PD input power). >

Patent
30 Apr 1991
TL;DR: In this article, the frequency difference between a local signal and the carrier wave of a receive signal which are close together in frequency, the receive signal having been subjected to phase state modulation by a modulation signal and thus having a phase that includes a transmission phase shift, a modulation phase shift corresponding to one of a plurality of phase states, and a synchronization phase shift due to the frequency differences.
Abstract: A digital cellular radiocommunication system includes a circuit for evaluating the frequency difference between a local signal and the carrier wave of a receive signal which are close together in frequency, the receive signal having been subjected to phase state modulation by a modulation signal and thus having a phase that includes a transmission phase shift, a modulation phase shift corresponding to one of a plurality of phase states, and a synchronization phase shift due to the frequency difference. The circuit produces samples of the receive signal from which the transmission phase shift has been eliminated, detects the modulation phase shift of the samples in order to eliminate it, produces the mean phase of a series of samples, and produce the frequency difference on the basis of the mean phase of at least two series of samples and on the basis of the time interval between the middles of the series.

Proceedings ArticleDOI
27 Mar 1991
TL;DR: Performance measures for a class of continuous phase-coded spread-spectrum systems and the error probability can be evaluated if the distributions of the multiple-access interferences (MAI) are available.
Abstract: Performance measures for a class of continuous phase-coded spread-spectrum systems are considered. The error probability can be evaluated if the distributions of the multiple-access interferences (MAI) are available. A method of characterization is used to obtain the conditional distributions of random variables that characterize the MAI given the time delays. Then, these conditional distributions are used to compute vectors, which allow the average bit-error probability to be computed with arbitrary accuracy. The class of systems possesses beneficial spectral properties and a good multiple-access capability. >

Journal ArticleDOI
TL;DR: In this article, the required high-frequency laser diode (LD) responses for a continuous phase frequency shift keying (CPFSK) heterodyne delay modulation system were investigated.
Abstract: The required high-frequency laser diode (LD) FM responses for a continuous phase frequency shift keying (CPFSK) heterodyne delay modulation system were investigated. The degradations due to insufficient high-frequency FM response are evaluated, considering the FSK waveform distortion, which gives undesired phase error at the demodulation circuit. From the phase error, bit error rate (BER) degradation is calculated. The calculated results indicate that the delay-time adjustment for the demodulation circuit is effective in minimizing the power penalty. The theoretical evaluation, including the demodulation circuit optimization, explains the experimental results fairly well. Using the same evaluation procedure, required high-frequency LD FM responses are derived. The results, together with the required low-frequency FM responses, give guidelines for transmitter LD selection for coherent CPFSK systems. >

Proceedings ArticleDOI
02 Dec 1991
TL;DR: In this paper, a suboptimum noncoherent detector for partial response CPM (continuous phase modulation) is studied and the number of filters in the filter bank is reduced by using a limited signal space in the CPM detector.
Abstract: A suboptimum noncoherent detector for partial response CPM (continuous phase modulation) is studied. The number of filters in the filter bank is reduced by using a limited signal space in the CPM detector. It is found that the number of dimensions in the mismatched detector can be considerably reduced. For a quaternary 2RC scheme with h=1/3, the number of filters is reduced from 32 to eight with a loss of about 0.5 dB in error performance. SAN(B), a limited tree search algorithm, is used for the symbol decision. >

Journal ArticleDOI
01 Jan 1991-Frequenz
TL;DR: In this paper, the authors considered a continuous phase FSK (continuous phase frequency shift keying, CPFSK) which is a non-linear modulation scheme and proposed to regard MSK as a linear pulse amplitude modulation scheme (PAM).
Abstract: MSK (minimum shift keying) is a binary digital modulation scheme leading to spectrally efficient modulated signals. A straightforward view of MSK is to consider this modulation scheme as continuous phase FSK (continuous phase frequency shift keying, CPFSK) which is a non-linear modulation scheme. It would be desirable to be able to regard MSK as a linear pulse amplitude modulation scheme (PAM). It then would be possible to exploit the advantages of linear modulation schemes in terms of signal generation by a transmitter and signal processing by a receiver

Proceedings ArticleDOI
01 Jun 1991
TL;DR: In this paper, the analog dependence of molecular orientation on voltage actually improves the efficiency of the devices in addition to enabling an adaptive switching capability, and an example is given of how a smoothly varying phase profile in a small region can be produced by allowing one of the electrodes to conduct above the ground plane and thereby drop volts and induce a continuous phase gradient.
Abstract: At present there is considerable interest in fixed binary optic systems made by micro- fabrication techniques to produce arrays of miniature optical components for the control of light. These devices essentially replicate the phase curvature of their macroscopic counterparts by a 2n level substrate etched using n binary masks, the approximation being tolerated because of the multiplicity achieved. There exists a corresponding set of active binary devices where instead of the phase modulation being produced by substrate depth changes, micro electrodes modulate the orientation of birefringent molecules with applied binary voltages. This paper reviews some of the experimental devices which have been made using this approach such as phase gratings, prisms and lenses. It is shown how the analog dependence of molecular orientation on voltage actually improves the efficiency of the devices in addition to enabling an adaptive switching capability. An example is given of how a smoothly varying phase profile in a small region can be produced by allowing one of the electrodes to conduct above the ground plane and thereby drop volts and induce a continuous phase gradient. Furthermore electrostatic edge effects at the finely spaced electrodes can be exploited at the sharp binary edges produced by the lithographic mask to suppress the higher order diffraction orders which can limit the performance of these systems.© (1991) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.


Journal ArticleDOI
TL;DR: The proposed frequency synthesizer possesses a fast switching time and good spectral purity owing to the use of a double loop PLL and uses a look-up table as a continuous phase divider.
Abstract: A new method of frequency synthesis based on double loop PLL and a continuous phase divider is presented. The proposed frequency synthesizer possesses a fast switching time and good spectral purity owing to the use of a double loop PLL. An analytical analysis of the proposed system, which uses a look-up table as a continuous phase divider, is given. Expressions for the switching time and the level of spurious frequencies are presented.

Patent
03 Apr 1991
TL;DR: In this paper, the Fourier transform of the product of a cardinal sine with a gaussian and with a symmetric time-domain window having a duration corresponding to several zero-crossings of the sine function is applied to the in-phase component of the carrier.
Abstract: The method uses digital modulation of a carrier by phase displacement, with four states, on the basis of a signal consisting of binary symbols with a defined period. On transmission, the modulating signal is shaped by filtering with a frequency-domain transfer function which is the Fourier transform of the product of a cardinal sine with a gaussian and with a symmetric time-domain window having a duration corresponding to several zero-crossings of the cardinal sine function, and one shaped binary symbol in two is applied to the in-phase component of the carrier and the other shaped binary symbols to the carrier in quadrature, with a shift of one binary symbol period.

Proceedings ArticleDOI
01 Feb 1991
TL;DR: The use of integrated optics phase modulators, which are highly linear, enables the generation of optical wideband FM signals with very low intermodulation distortion as discussed by the authors, can be used as part of an optical wide-band FM link for RF and microwave signals.
Abstract: The wideband frequency modulation (FM) of an optical carrier by a radio frequency (RF) or microwave signal can be accomplished independent of laser type when indirect modulation is employed Indirect modulators exploit the integral relation of phase to frequency so that phase modulators can be used to impress frequency modulation on an optical carrier The use of integrated optics phase modulators, which are highly linear, enables the generation of optical wideband FM signals with very low intermodulation distortion This modulator can be used as part of an optical wideband FM link for RF and microwave signals Experimental results from the test of an indirect frequency modulator for an optical carrier are discussed

Journal ArticleDOI
TL;DR: In this paper, a high sensitivity receiver using delay demodulation techniques for multigigabit-per-second continuous phase frequency shift keying (CPFSK) transmission systems was investigated experimentally and theoretically.
Abstract: A high sensitivity receiver using delay demodulation techniques for multigigabit-per-second continuous phase frequency shift keying (CPFSK) transmission systems was investigated experimentally and theoretically. A receiver sensitivity of 67 photons/b or -46.7 dBm at a 10/sup -9/ BER was experimentally achieved at 2.488 Gb/s using 1.55- mu m distributed feedback laser diodes (LDs) for the transmitter and local oscillator. This receiver enables transmission over 308 km through 1.3- mu m zero-dispersion single-mode fiber. Experimental results are closely matched by computer simulation results which take into account the effects of eye degradation and noise filtering. These effects are mainly caused by the bandwidth limitations of the intermediate frequency bandpass filter and baseband low-pass filter. The simulation also takes into account the effects of nonflat LD frequency response, intrinsic finite frequency response of the delay demodulator, optical fiber chromatic dispersion, and laser phase noise. >

Journal ArticleDOI
T. Palenius1
TL;DR: A slightly modified SAN (B) suboptimum noncoherent detector for continuous phase modulation (CPM), is studied on a phase jittering channel using a relatively short observation interval to improve error performance.
Abstract: A slightly modified SAN (B) suboptimum noncoherent detector for continuous phase modulation (CPM), is studied on a phase jittering channel. The modified algorithm uses a relatively short observation interval. This leads to a much improved error performance on the phase jittering channel.

Patent
25 Apr 1991
TL;DR: In this article, a preferred embodiment of the invention referred to as Continuous Phase Quadrature Frequency/Phase Modulation (CP QFPM) is introduced, where the same frequencies are used in both quadrature components of the QFPMsignal set which yields a constant-envelope signal set.
Abstract: Quadrature Biorthogonal Modulation Abstract Digital modulation/demodulation methods utilize multiplexing in quadrature of two N-dimensional biorthogonal signal sets wherein the said signal sets are transmitted on each of the two quadrature carriers cos.omega.ct and sin.omega.ct in order to increase the bandwidth efficiency and/or the power efficiency as compared to known digital transmission methods. One embodiment of the invention utilizes two sets of combined frequency/phase modulated (FPM) signals of the type NFSK/2PSK with adjacent frequencies separation of 1/T Hz as the constituent biorthogonal signal sets, and is referred to as Quadrature Frequency/Phase Modulation (QFPM). A preferred embodiment of the invention referred to as Continuous Phase Quadrature Frequency/Phase Modulation (CP QFPM) is essentially a modified QFPM scheme with sinusoidal shaping and an offset of T/2 in the relative alignment of the baseband modulating waveforms for the two quadrature components of the QFPMsignal set. Another preferred embodiment of the invention, referred to as Continuous Phase Frequency/Phase Modulation (CP FPM), is a particular case of CP QFPM wherein the same frequencies are used in both quadrature components of CP QFPM which yields a constant-envelope signal set.

Proceedings ArticleDOI
27 Mar 1991
TL;DR: In this paper, a baseband pulse shaping is proposed to reduce intersymbol interference of M-ary Continuous Phase Frequency Shift Keyed (CPFSK) signals in narrowband channels, and three symbol by symbol detection techniques, namely, limiter discriminator detection, differentially coherent detection, and coherent detection with differential decoding, are considered separately for signal detection.
Abstract: Baseband pulse shaping is proposed to reduce intersymbol interference of M-ary Continuous Phase Frequency Shift Keyed (CPFSK) signals in narrowband channels. It is shown that the error rate performance of M-ary CPFSK signals with modulation index 1/M can be significantly improved by using a raised cosine baseband pulse. Three symbol by symbol detection techniques, namely, limiter discriminator detection, differentially coherent detection, and coherent detection with differential decoding, are considered separately for signal detection. A synchronization structure which is similar to one that is available for CPFSK signals is also suggested for M-ary pulse shaped signals with modulation index 1/M. >

Proceedings ArticleDOI
02 Dec 1991
TL;DR: A formula is derived for the error probability of partial response continuous phase modulation with differential phase detection in a multipath Rayleigh fading channel taking into account frequency selective fading, co-channel interference, Doppler frequency shift and additive Gaussian noise while the receiver rejects a specified amount of adjacent channel interference.
Abstract: A formula is derived for the error probability of partial response continuous phase modulation (CPM) with differential phase detection in a multipath Rayleigh fading channel taking into account frequency selective fading, co-channel interference, Doppler frequency shift and additive Gaussian noise while the receiver rejects a specified amount of adjacent channel interference. A formula for the error floor is also presented. Numerical results are presented for Gaussian minimum-shift keying (GMSK) with a premodulation normalized filter bandwidth of 0.25. >

Proceedings ArticleDOI
TL;DR: In this article, an upper bound on diffraction efficiency for fan-out ranges from 2 to 25, for continuous phase fan-outs, between 97% and 98%, and for (0,π)-binary phase fanout, between 87% and 88%.
Abstract: For one-dimensional binary phase [(0,π) and (0,non-π)] array generators and for one-dimensional continuous or multilevel quantized phase array generators, an upper bound on diffraction efficiency is presented for fan-outs ranging from 2 to 25. The upper bound is determined by optimizing, with respect to array phase, the upper bound on diffraction assuming a coherent array. To determine the upper bound for binary phase gratings restrictions on array phase are imposed. For fan-outs greater than five, the upper bound on diffraction efficiency for continuous phase fan-outs ranges between 97% and 98%; for (0,π)-binary phase fan-outs the upper bound ranges between 83% and 84%; and for (0,non-π)-binary phase, between 87% and 88%.