Title :
Convolutional Spreading CDMA and Comparison With the DS-CDMA With RAKE Receiver
Author :
Weerasinghe, Nalin S. ; Hasimoto, Takeshi
Author_Institution :
Hasimoto Lab., Univ. of Electro-Commun., Tokyo
Abstract :
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
Keywords :
amplifiers; binary codes; block codes; code division multiple access; convolutional codes; error statistics; radio receivers; radiofrequency interference; spread spectrum communication; ternary codes; BER performance; CS-CDMA; MUI; RAKE receiver; Suehiro´s CDMA; binary zero correlation zone codes; bit-error rate; block spreading; convolutional spreading; cyclic-prefix; direct-sequence code-division multiple access; multiuser interference; nonlinear amplifier; synchronous downlink DS-CDMA; ternary ZCZ codes; Bit error rate; Convolutional codes; Direct-sequence code-division multiple access; Downlink; Fading; Interference; Multiaccess communication; Multipath channels; Peak to average power ratio; Propagation losses; Code-division multiple access (CDMA); convolutional spreading (CS); cyclic (CP) prefix; multiuser interference (MUI); zero correlation zone (ZCZ) spreading sequences;
Journal_Title :
Communications, IEEE Transactions on
DOI :
10.1109/TCOMM.2006.884818
