TY - GEN
T1 - Diversity-coding-orthogonality tradeoff for coded MC-CDMA with high level modulation
AU - Garg, Deepshikha
AU - Adachi, Fumiyuki
PY - 2004/1/1
Y1 - 2004/1/1
N2 - In MC-CDMA, the data rate can be increased by reducing the spreading factor SF or by allowing multicode transmission. In this paper, we evaluate by computer simulations which gives a better bit error rate (BER) performance - lower SF or multi code operation - when high level modulation is used in addition to error control coding. For a coded system in a frequency selective channel, there is a tradeoff between frequency diversity gain due to the spreading of symbols, coding gain due to better frequency interleaving effect and orthogonality destruction. It is shown that for QPSK, the performance of OFDM (MCCDMA with SF=I) is almost the same as that of a fully spread MC-CDMA system. However, for 16QAM and 64QAM, the BER performance is better for lower SF unlike the uncoded system, wherein higher SF gives a better BER.
AB - In MC-CDMA, the data rate can be increased by reducing the spreading factor SF or by allowing multicode transmission. In this paper, we evaluate by computer simulations which gives a better bit error rate (BER) performance - lower SF or multi code operation - when high level modulation is used in addition to error control coding. For a coded system in a frequency selective channel, there is a tradeoff between frequency diversity gain due to the spreading of symbols, coding gain due to better frequency interleaving effect and orthogonality destruction. It is shown that for QPSK, the performance of OFDM (MCCDMA with SF=I) is almost the same as that of a fully spread MC-CDMA system. However, for 16QAM and 64QAM, the BER performance is better for lower SF unlike the uncoded system, wherein higher SF gives a better BER.
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U2 - 10.1109/ICCS.2004.1359458
DO - 10.1109/ICCS.2004.1359458
M3 - Conference contribution
AN - SCOPUS:84934277890
T3 - 9th International Conference on Communications Systems 2004, ICCS 2004
SP - 650
EP - 654
BT - 9th International Conference on Communications Systems 2004, ICCS 2004
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 9th International Conference on Communications Systems, ICCS 2004
Y2 - 7 September 2004
ER -