Topic
Continuous phase modulation
About: Continuous phase modulation is a research topic. Over the lifetime, 3199 publications have been published within this topic receiving 37245 citations. The topic is also known as: CPM.
Papers published on a yearly basis
Papers
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01 Dec 2012
TL;DR: In this paper, a K-band phase shifter with low insertion-loss variation fabricated with the TSMC standard 0.18-μm 1P6M CMOS technology is presented.
Abstract: This paper presents a K-band phase shifter with low insertion-loss variation fabricated with the TSMC standard 0.18-μm 1P6M CMOS technology. Low insertion loss variation is achieved by using impedance matching of the reflective load. To achieve a phase control range of 360°, a different 180° phase switch-type phase shifter (STPS) is applied to the output of a 180° continuous phase control range reflection-type phase shifter (RTPS). In this design, the layer of the bottom metal (M1) as the ground plane is used to minimize the substrate loss. The measured results show that the insertion loss variation in the phase control range is less than 1.2 dB, and the phase control range is 275° at 23 GHz. The chip size is 0.45 mm2 with pads and with no power consumption.
15 citations
09 Mar 2014
TL;DR: This work experimentally demonstrates biorthogonal modulation in 8 dimensions as binary pulse-position modulation polarization-switched QPSK and compares it with PM-QPSK at the same bit rate and shows a 1.4 dB sensitivity gain and 84 % increased transmission distance.
Abstract: We experimentally demonstrate biorthogonal modulation in 8 dimensions as binary pulse-position modulation polarization-switched QPSK. We compare this format with PM-QPSK at the same bit rate and show a 1.4 dB sensitivity gain and 84 % increased transmission distance.
15 citations
TL;DR: The authors analyze the problem of noncoherent FM demodulation of trellis-coded continuous-phase M-ary FSK (frequency-shift keying) with upper bounds on the bit error rate as well as the 99% energy bandwidth for the codes under consideration.
Abstract: The authors analyze the problem of noncoherent FM demodulation of trellis-coded continuous-phase M-ary FSK (frequency-shift keying). The FM demodulation process is divided into two parts, the first being the actual noncoherent FM demodulation and the second being trellis decoding of the data. Upper bounds on the bit error rate as well as the 99% energy bandwidth are determined for the codes under consideration. In particular, the authors consider the trellis codes with rates 1/2 and 2/3 and symmetric and asymmetric signal constellations. Upper bounds on the probability of error are obtained for the symmetric and the optimum asymmetric cases. The optimum asymmetry is one which minimizes the bit error probability. The performance of this system is compared to that of the standard continuous phase modulation techniques employing noncoherent detection. >
15 citations
Patent•
31 Aug 1992TL;DR: In this article, a coherent demodulating device is characterized by a demodulation circuit and a carrier recovering circuit produced entirely in digital form, where the analog signals are digitized by sampling at symbol reception frequency into incoming digital signals.
Abstract: A coherent demodulating device is characterized by a demodulating circuit and a carrier recovering circuit produced entirely in digital form. Two quadrature demodulation carrier waves produced by a local oscillator are mixed with a demodulation carrier signal modulated by symbols to produce analog signals. The analog signals are digitized by sampling at symbol reception frequency into incoming digital signals. A digital phase shifter phase shifts the incoming signals by a demodulation phase derived by a phase loop digital processing circuit as from error signal pulses supplied by a comparing circuit receiving outgoing digital signals from the phase shifter. The compensation for the phase and frequency differences between the demodulation and modulation carrier waves is carried out a posteriori in digital form by phase shifting the incoming signals.
15 citations
TL;DR: It is shown that, while more robust than a system with coherent reception, the proposed system offers superior energy efficiency compared with conventional single-symbol noncoherent reception.
Abstract: A system involving the multisymbol noncoherent reception of coded continuous-phase frequency-shift keying is developed, optimized, and analyzed Unlike coherent systems, the modulation index of the waveform does not need to be rational with a small denominator, and the oscillator only needs to be stable for the duration of a small block of symbols The achievable performance over AWGN and Rayleigh block-fading channels is determined by computing the average mutual information, which is the capacity of a channel using the given modulation format and receiver architecture under the constraint of uniformly distributed input symbols The code rate and modulation index are jointly optimized with respect to average mutual information under a bandwidth constraint For binary and quaternary signaling, the information-theoretic results are corroborated by bit-error-rate curves generated using a standardized turbo code in conjunction with iterative demodulation and decoding It is shown that, while more robust than a system with coherent reception, the proposed system offers superior energy efficiency compared with conventional single-symbol noncoherent reception
15 citations