DocumentCode :
1057316
Title :
Throughput Analysis for Code Division Multiple Accessing of the Spread Spectrum Channel
Author :
Hui, Joseph Y N
Author_Institution :
Bell Comm. Res., Murray Hill, NJ, USA
Volume :
2
Issue :
4
fYear :
1984
fDate :
7/1/1984 12:00:00 AM
Firstpage :
482
Lastpage :
486
Abstract :
We consider the use of error correction codes of rate r on top of pseudonoise (PN) sequence coding for code division multiple accessing of the spread spectrum channel. The channel is found to have a maximum throughput of 0.72 and 0.36 based on the evaluation of channel capacity and cutoff rate, respectively. More generally, these two values are derived for given bandwidth expanding n/r versus n/N where n is the length of the PN sequence and N is the number of simultaneous users. It is found that to achieve the maximum throughput, n should be small. This implies that coding schemes with short PN sequences and low rate codes are superior in terms of throughput or antijam capability. The extreme case of n = 1 corresponds to using a very low rate code with no PN sequence coding. Convolutional codes are recommended and analyzed for their error rate and decoding complexity.
Keywords :
CDMA (code-division multiple-access); Code division multiaccess (CDMA); Code-division multiple-access; Error-correction coding; Land mobile radio; Bandwidth; Convolutional codes; Decoding; Error analysis; Error correction codes; Interference; Spread spectrum communication; Throughput; Transmitters; Viterbi algorithm;
fLanguage :
English
Journal_Title :
Selected Areas in Communications, IEEE Journal on
Publisher :
ieee
ISSN :
0733-8716
Type :
jour
DOI :
10.1109/JSAC.1984.1146083
Filename :
1146083
Link To Document :
بازگشت