Channel-dependent adaptive spreading code selection in downlink MC-CDMA

Shota Yoshimura, Kenichi Higuchi

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

This paper proposes a channel-dependent adaptive spreading code selection method in downlink multicarrier code division multiple access (MC-CDMA). The proposed method is compared to the conventional MC-CDMA and orthogonal frequency division multiple access (OFDMA). First we show that the signal-to-noise and interference power ratio (SINR) after minimum mean squared error (MMSE)-based equalization is represented as a weighted average of the instantaneous SNR of the respective subcarriers to which the spread symbols are mapped, where the weighting factor is determined by the respective chip power of the spreading sequence. Based on this, we propose a method for channel-dependent adaptive spreading code selection in which the minimum SINR among code multiplexed users is maximized. The simulation results show that the proposed adaptive spreading code selection increases the minimum SINR at the outage probability of 10 -2 by approximately 1 dB compared to the OFDMA with channel-dependent subcarrier allocation (frequency-domain scheduling).

Original languageEnglish
Title of host publication2011 IEEE 73rd Vehicular Technology Conference, VTC2011-Spring - Proceedings
DOIs
Publication statusPublished - 29 Aug 2011
Event2011 IEEE 73rd Vehicular Technology Conference, VTC2011-Spring - Budapest, Hungary
Duration: 15 May 201118 May 2011

Publication series

NameIEEE Vehicular Technology Conference
ISSN (Print)1550-2252

Conference

Conference2011 IEEE 73rd Vehicular Technology Conference, VTC2011-Spring
CountryHungary
CityBudapest
Period15/05/1118/05/11

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Yoshimura, S., & Higuchi, K. (2011). Channel-dependent adaptive spreading code selection in downlink MC-CDMA. In 2011 IEEE 73rd Vehicular Technology Conference, VTC2011-Spring - Proceedings [5956760] (IEEE Vehicular Technology Conference). https://doi.org/10.1109/VETECS.2011.5956760