TY - GEN
T1 - Diversity-coding-orthogonality tradeoff for coded MC-CDMA with high level modulation
AU - Garg, Deepshikha
AU - Adachi, Fumiyuki
PY - 2004
Y1 - 2004
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 multicode 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 (MC-CDMA with SF=1) 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 multicode 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 (MC-CDMA with SF=1) 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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M3 - Conference contribution
AN - SCOPUS:14244250279
SN - 0780385497
T3 - 2004 9th IEEE Singapore International Conference on Communication Systems, ICCS
SP - 650
EP - 654
BT - 2004 9th IEEE Singapore International Conference on Communication Systems, ICCS
T2 - 2004 9th IEEE Singapore International Conference on Communication Systems, ICCS
Y2 - 6 September 2004 through 9 September 2004
ER -