Showing papers on "Phase-shift keying published in 1972"
TL;DR: It is shown that the optimum rule is to select the location that maximizes the sum of the correlation and a correction term to locate a sync word periodically imbedded in binary data and received over the additive white Gaussian noise channel.
Abstract: This paper considers the optimum method for locating a sync word periodically imbedded in binary data and received over the additive white Gaussian noise channel. It is shown that the optimum rule is to select the location that maximizes the sum of the correlation and a correction term. Simulations are reported that show approximately a 3-dB improvement at interesting signal-to-noise ratios compared to a pure correlation rule. Extensions are given to the "phase-shift keyed (PSK) sync" case where the detector output has a binary ambiguity and to the case of Gaussian data.
335 citations
TL;DR: Results that are useful in such studies as well as in network planning are presented, concerned with the problems of carrier synchronization and noisy reference detection of polyphase signals.
Abstract: Digital communication networks used for the distribution of high-speed digital information are currently the subject of design studies for many civil and military applications. This paper presents results that are useful in such studies as well as in network planning. In particular, the paper is concerned with the problems of carrier synchronization and noisy reference detection of polyphase signals. Reconstruction of coherent references for the detection of polyphase [ N -ary phase-shift-keyed (PSK)] signals is considered and analyzed for three carrier reconstruction loops, namely, N th power (multiply-and-divide) loops, generalized Costas ( I-Q ) loops, and extensions of data-aided (modulation wipeoff) loops. General expressions for the error probability are developed when the reconstructed reference signals are noisy. These expressions are evaluated numerically for cases of practical interest and compared with differentially coherent reception.
49 citations
TL;DR: A digital modulation technique has been developed that has the constant level advantage of frequency-shift keying systems while retaining the error rate and threshold performance of coherently detected binary or four-phase phase-shiftkeying systems.
Abstract: A nationwide data network is planned that will employ microwave relay networks for both long-haul and short-haul interconnection. A digital modulation technique has been developed that has the constant level advantage of frequency-shift keying (FSK) systems while retaining the error rate and threshold performance of coherently detected binary or four-phase phase-shift keying (PSK). Occupied spectrum and interference characteristics of a 21.5-Mbit/s data system are compared to the more conventional 600-, 1200-, and 1800-channel message systems.
29 citations
TL;DR: The paper presents the analysis and performance of differentially encoded coherent MPSK systems that reconstruct coherent reference signals by means of generalized Costas or N th power loops and the special cases of quadriphase and octaphase signaling.
Abstract: Any digital communication system that employs coherent detection requires coherent reference signals for proper operation. This paper is concerned with the transmission and detection of differentially encoded multiple phase-shift-keyed (MPSK) signals and the ambiguity resolution problem that results from suppression of the transmitted carrier. In particular, the paper presents the analysis and performance of differentially encoded coherent MPSK systems that reconstruct coherent reference signals by means of generalized Costas or N th power loops. The performance of such systems is then compared with that of ideal reception of MPSK signals and differentially coherent detection of differentially encoded MPSK signals. Emphasis is placed upon the special cases of quadriphase and octaphase signaling.
7 citations
22 May 1972
TL;DR: In this paper, a phase coherent parametric mixer pumped by quadruple frequency of input signal is developed with the objects of obtaining a carrier recovery circuit for synchronous detection and a new phase regenerator with excellent characteristics, especially for high-speed four-phase communications.
Abstract: A new phase coherent parametric mixer pumped by quadruple frequency of input signal is developed with the objects of obtaining a carrier recovery circuit for synchronous detection and a new phase regenerator with excellent characteristics, especially for high-speed four-phase communications.
4 citations
TL;DR: An experimental guided millimeter-wave transmission system is constructed employing two 806-Mbit/s digital repeaters, an 8.4-km waveguide line loop, and channel coupling networks, and timing jitter characteristics are presented.
Abstract: An experimental guided millimeter-wave transmission system is constructed employing two 806-Mbit/s digital repeaters, an 8.4-km waveguide line loop, and channel coupling networks. This paper presents its characteristics, such as waveforms, amplitude and delay, error rate, and timing jitter in some detail.
3 citations
TL;DR: An investigation of channel spacing for multiple biphase-shift-keyed (BPSK) signals accessing a hard-limiter satellite found rules for the spacing of active channels when six or more BPSK signals are accessing the hard limiter.
Abstract: This paper describes an investigation of channel spacing for multiple biphase-shift-keyed (BPSK) signals accessing a hard-limiter satellite. The effects of intermodulation and modulation spectrum interference on the bit error rate of the active channels were considered. Results and conclusions of experimental errorrate data are presented for various channel spacing arrangements. Of major significance is the formation of rules for the spacing of active channels when six or more BPSK signals are accessing the hard limiter.
3 citations
3 citations
TL;DR: Several expressions are derived for the probability of error of a binary coherent phase-shift keyed communication system in the presence of interference due to discrete multipath propagation.
Abstract: Several expressions are derived for the probability of error of a binary coherent phase-shift keyed communication system in the presence of interference due to discrete multipath propagation.
3 citations
TL;DR: The dead zone threshold is considered, which is the difference between the two filter outputs that must differ from a threshold by some finite amount in order to cause the device to respond reliably in a binary digital communication system.
Abstract: The function of the receiver in a binary digital communication system is to make a binary (?space?, ?mark? or ?"0?, ?1?) decision by comparing the signal values from the mark and space filters (or correlators) at known successive time intervals (?bit? or ?baud? time intervals). When the signal value out of the mark filter is greater than that out of the space filter, it is decided that mark or 1 is transmitted, and vice versa. It is of fundamental importance to know the exact instant of time at which the two filter outputs are to be compared. This is the problem of synchronization between the transmitter and the receiver. In this paper, we assume a system that is perfectly synchronized. In a practical system, the difference between the two filter outputs must differ from a threshold by some finite amount in order to cause the device to respond reliably. The examination of the effects of this dead zone (finite-width decision threshold) on digital transmission systems is of important practical interest. Its effects on binary differentially coherent phase-shift-keying, and m-level phase-shift-keying systems have been investigated previously. In this paper we consider its effects on binary coherent phase-shift-keying (CPSK), coherent orthogonal (CFSK), and noncoherent orthogonal (NCFSK) systems. The probability of bit error and the channel capacity of each system is obtained in terms of the dead zone threshold.
1 citations
TL;DR: In this paper, a coherent demodulator for p.k.s. signals at microwave-carrier frequencies using an open-squaring phase-locked loop is described and evaluated experimentally.
Abstract: A coherent demodulator for p.s.k. signals at microwave-carrier frequencies using an open-squaring phase-locked loop is described and evaluated experimentally. The circuit has been operated at a 50 Mbit data rate, and should operate at much higher data rates. Error measurements in the presence of Gaussian noise confirm that the circuit performs as an ideal coherent detector until the phase-locked-loop threshold is reached.
TL;DR: The effects of implementation errors in tapped delay line filters on the peak- to-sidelobe ratio and the signal-to-noise ratio of binary PSK pulse compression codes are considered.
Abstract: The effects of implementation errors in tapped delay line filters on the peak-to-sidelobe ratio and the signal-to-noise ratio of binary PSK pulse compression codes are considered. As error model the delay elements and weighting factors of such filters are assumed to have an error distribution with known mean and variance.