DocumentCode :
913912
Title :
Partial response continuous phase modulation and DPCM coding for speech transmission in cellular mobile radio systems
Author :
Varma, Vijay K. ; Gupta, Someshwar C.
Author_Institution :
Bell Communications Research, Red Bank, NJ
Volume :
35
Issue :
3
fYear :
1986
Firstpage :
100
Lastpage :
105
Abstract :
The performance of a speech transmission scheme with application to cellular digital mobile radio systems is considered. The source coder is embedded differential pulse code modulation (DPCM) and the modulation schemes belong to the class of partial response continuous phase modulation (CPM). Both quantizing noise and transmission errors contribute to the overall mean square error. The performance measure is the audio signal-to-noise ratio (SNR). 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. The number of channels the system can support is evaluated under various conditions.
Keywords :
Amplitude modulation; Bandwidth; Continuous phase modulation; Fading; Land mobile radio; Modulation coding; Pulse modulation; Receivers; Signal to noise ratio; Speech coding;
fLanguage :
English
Journal_Title :
Vehicular Technology, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9545
Type :
jour
DOI :
10.1109/T-VT.1986.24078
Filename :
1623391
Link To Document :
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