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Bit Error Probability and Throughput Performance of Time Spread PPM/CDMA Systems
IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 1992/12/25
Print ISSN: 0916-8508
Type of Manuscript: Special Section PAPER (Special Section on Networks and Mobile Communications)
SS/CDMA, time spread PPM, bit error probability, throughput, transmission efficiency,
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A model for time spread-pulse position modulation (TS-PPM)/code division multiple access (CDMA) systems is presented. A TS signal is produced by a TS-filter, whose characteristic is a pseudonoise sequence in frequency domain. The error probability performance is analyzed and compared with those of on-off keying (OOK) and binary phase shift keying (BPSK). It is shown that at the same transmission speed TS-PPM is superior to TS-OOK and TS-BPSK due to the dramatic decrease of multiple access interference. The throughput of the network is analyzed, and its relation to the length of pseudonoise sequence and the packet length is also discussed.