Journal ArticleDOI
On continuous phase modulation in cellular digital mobile radio systems
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This paper considers the application of constant-amplitude, partial-response, continuous-phase modulation with simple near-optimum receivers to cellular digital mobile radio systems, finding smoothed modulation schemes have low spectral sidelobes and narrow main lobes.Abstract:
This paper considers the application of constant-amplitude, partial-response, continuous-phase modulation with simple near-optimum receivers to cellular digital mobile radio systems. These smoothed modulation schemes have low spectral sidelobes and narrow main lobes. A combiner for time-division retransmission systems with space diversity is given for continuous-phase modulation. Cochannel interference and adjacent-channel interference are calculated for continuous-phase modulation in cellular systems with frequency reuse. The efficiency of 3RC and 4RC modulations with space diversity is evaluated for conventional cellular systems.read more
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Journal ArticleDOI
Continuous phase modulation
TL;DR: A number of methods for constructing constant amplitude signals which significantly outperform MSK are considered, and at what level of complexity these improvements are obtained and realized.
Journal ArticleDOI
Alternative cell configurations for digital mobile radio systems
TL;DR: It is concluded that the new antenna configurations can significantly improve trunking efficiency and show how transmitter power weighting can improve the signal-to-cochannel-interference ratio for the novel cellular systems.
Journal ArticleDOI
Performance of Partial Response CPM in the Presence of Adjacent Channel Interference and Gaussian Noise
TL;DR: It is found that in the presence of adjacent channel interference, certain schemes perform better than minimum shift keying (MSK) and judicious choice of modulation scheme and receiver filter can result in better spectrum utilization.
Journal ArticleDOI
Signal-to-interference calculations for corner-excited cellular communications systems
S.-W. Wang,S. Rappaport +1 more
TL;DR: Signal-to-inference ratio calculations for corner-excited cellular communications systems are presented and show that the effect of adjacent channel interference compared to cochannel interference cannot be ignored in general.
Journal ArticleDOI
Partial response continuous phase modulation and DPCM coding for speech transmission in cellular mobile radio systems
V.K. Varma,S.C. Gupta +1 more
TL;DR: It is seen that in a fading environment space diversity is very effective in bringing down the threshold of channel SNR to maintain the required audio SNR.
References
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Journal ArticleDOI
GMSK Modulation for Digital Mobile Radio Telephony
K. Murota,K. Hirade +1 more
TL;DR: In this article, a digital modulation for future mobile radio telephone services is proposed, and its fundamental properties are clarified with the aid of machine computation, and the constitution of modulator and demodulator is discussed from the viewpoints of mobile radio applications.
Journal ArticleDOI
Advanced mobile phone service: The cellular concept
TL;DR: In this paper, a cellular system operating within a limited block of frequency spectrum can meet the objectives of a large-scale mobile-telephone service designed with attention to cost restraint.
Journal ArticleDOI
Continuous Phase Modulation--Part I: Full Response Signaling
Tor Aulin,C.-E. Sundberg +1 more
TL;DR: Comparisons are made with minimum shift keying (MSK) and systems have been found which are significantly better in E_{b}/N_{0} for a large signal-to-noise ratio (SNR) without expanded bandwidth, and schemes with the same bit error probability as MSK but with considerably smaller bandwidth have also been found.
Journal ArticleDOI
Continuous Phase Modulation--Part II: Partial Response Signaling
TL;DR: It is concluded that partial response CPM systems have spectrum compaction properties and at equal or even smaller bandwidth than minimum shift keying (MSK), a considerable gain in transmitter power can be obtained.
Journal ArticleDOI
A spread-spectrum technique for high-capacity mobile communications
George R. Cooper,R.W. Nettleton +1 more
TL;DR: The spectral efficiency of the spread-spectrum scheme may exceed those of the narrow-band schemes by a factor of almost five, and more ambitious bit-rate-reducing speech digitization methods could improve still further on these figures.