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Convolutional Spreading CDMA and Comparison With the DS-CDMA With RAKE Receiver

2006; IEEE Communications Society; Volume: 54; Issue: 11 Linguagem: Inglês

10.1109/tcomm.2006.884818

ISSN

1558-0857

Autores

Nalin S. Weerasinghe, Takeshi Hasimoto,

Tópico(s)

PAPR reduction in OFDM

Resumo

For synchronous downlink direct-sequence code-division multiple access (DS-CDMA), we introduce a cyclic-prefix (CP)-based convolutional spreading CDMA (CS-CDMA/CP) scheme employing zero correlation zone (ZCZ) codes, which gives a class of multiuser interference (MUI)-free CDMA schemes, including Suehiro's CDMA and block spreading (BS) CDMA as special cases. We show that CS-CDMA/CP employing appropriately selected binary and ternary ZCZ codes have good user capacity, peak-to-average power ratio (PAPR), and transmission power loss, compared with previously proposed BS-CDMA schemes. By simulation, we show the effect of PAPR to its bit-error rate (BER) performance when nonlinear amplifiers are used, and also compare its BER performance with the conventional DS-CDMA scheme employing a RAKE receiver

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