Diversity-Coding-Orthogonality Trade-off for Coded MC-CDMA with High Level Modulation

Deepshikha GARG; Fumiyuki ADACHI

doi:10.1093/ietcom/e88-b.1.76

Diversity-Coding-Orthogonality Trade-off for Coded MC-CDMA with High Level Modulation

Deepshikha GARG, Fumiyuki ADACHI

Full Text Views

0

Share
Cite this

Summary :

In MC-CDMA, the data rate can be increased by reducing the spreading factor SF or by allowing multicode transmission. In this paper, we examine 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 trade-off among frequency diversity gain due to spreading, improved coding gain due to better frequency interleaving effect and orthogonality distortion. It is found 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.

Publication: IEICE TRANSACTIONS on Communications Vol.E88-B No.1 pp.76-83

Publication Date: 2005/01/01

Publicized

Online ISSN

DOI: 10.1093/ietcom/e88-b.1.76

Type of Manuscript: Special Section PAPER (Special Section on Multi-carrier Signal Processing Techniques for Next Generation Mobile Communications--Part 1)

Category: Diversity

Cite this

Copy

Deepshikha GARG, Fumiyuki ADACHI, "Diversity-Coding-Orthogonality Trade-off for Coded MC-CDMA with High Level Modulation" in IEICE TRANSACTIONS on Communications, vol. E88-B, no. 1, pp. 76-83, January 2005, doi: 10.1093/ietcom/e88-b.1.76.
Abstract: In MC-CDMA, the data rate can be increased by reducing the spreading factor SF or by allowing multicode transmission. In this paper, we examine 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 trade-off among frequency diversity gain due to spreading, improved coding gain due to better frequency interleaving effect and orthogonality distortion. It is found 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.
URL: https://globals.ieice.org/en_transactions/communications/10.1093/ietcom/e88-b.1.76/_p

Copy

@ARTICLE{e88-b_1_76,
author={Deepshikha GARG, Fumiyuki ADACHI, },
journal={IEICE TRANSACTIONS on Communications},
title={Diversity-Coding-Orthogonality Trade-off for Coded MC-CDMA with High Level Modulation},
year={2005},
volume={E88-B},
number={1},
pages={76-83},
abstract={In MC-CDMA, the data rate can be increased by reducing the spreading factor SF or by allowing multicode transmission. In this paper, we examine 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 trade-off among frequency diversity gain due to spreading, improved coding gain due to better frequency interleaving effect and orthogonality distortion. It is found 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.},
keywords={},
doi={10.1093/ietcom/e88-b.1.76},
ISSN={},
month={January},}

Copy

TY - JOUR
TI - Diversity-Coding-Orthogonality Trade-off for Coded MC-CDMA with High Level Modulation
T2 - IEICE TRANSACTIONS on Communications
SP - 76
EP - 83
AU - Deepshikha GARG
AU - Fumiyuki ADACHI
PY - 2005
DO - 10.1093/ietcom/e88-b.1.76
JO - IEICE TRANSACTIONS on Communications
SN -
VL - E88-B
IS - 1
JA - IEICE TRANSACTIONS on Communications
Y1 - January 2005
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 examine 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 trade-off among frequency diversity gain due to spreading, improved coding gain due to better frequency interleaving effect and orthogonality distortion. It is found 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.
ER -