DocumentCode :
1537834
Title :
Performance of low-rate orthogonal convolutional codes in DS-CDMA applications
Author :
Ormondroyd, R.F. ; Maxey, J.J.
Author_Institution :
Sch. of Electron. & Electr. Eng., Bath Univ., UK
Volume :
46
Issue :
2
fYear :
1997
fDate :
5/1/1997 12:00:00 AM
Firstpage :
320
Lastpage :
328
Abstract :
Low-rate orthogonal convolutional codes (LROCC), originally proposed by A.J. Viterbi (1971), can be used in a direct-sequence code-division multiple access (DS-CDMA) system to achieve both spreading of the data and providing coding gain. The implementation of this type of multiplexing in a practical DS-CDMA system is presented, and the theoretical performance of the proposed system under “other-user” noise, additive white Gaussian noise (AWGN), intercell interference, and thermal noise is established using a computer simulation. The improvement in system performance, gained through the use of a nonspreading randomizing sequence on the encoded output symbols, is also studied. Performance curves for a rate 1/64 orthogonal convolutional code are shown, and the impact of code rate, quantization methods, and constraint length on the overall system performance are discussed
Keywords :
Gaussian noise; cellular radio; code division multiple access; convolutional codes; digital radio; land mobile radio; personal communication networks; pseudonoise codes; radiofrequency interference; spread spectrum communication; thermal noise; white noise; AWGN; DS-CDMA applications; additive white Gaussian noise; celluar radio; code rate; coding gain; computer simulation; constraint length; data spreading; digital personal communication network; direct sequence code division multiple access; encoded output symbols; intercell interference; low-rate orthogonal convolutional codes; multiplexing; nonspreading randomizing sequence; other-user noise; performance curves; quantization methods; rate 1/64 orthogonal convolutional code; system performance; thermal noise; AWGN; Additive white noise; Computer simulation; Convolutional codes; Direct-sequence code-division multiple access; Gaussian noise; Interference; Multiaccess communication; System performance; Viterbi algorithm;
fLanguage :
English
Journal_Title :
Vehicular Technology, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9545
Type :
jour
DOI :
10.1109/25.580770
Filename :
580770
Link To Document :
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