Weight combining and subchannel allocation to reduce self interference in OFDMA-CDM system

Norikazu Matsui, Keisuke Mutou, Satoru Iijima, Iwao Sasase

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

3 Citations (Scopus)

Abstract

We propose a subchannel allocation by considering multiuser diversity to reduce Self Interference (SI) which arises due to the destrunction of orthogonality of spreading codes in Orthogonal Frequency Division Multiple Access - Code Division Multiplexing (OFDMA-CDM) system. The conventional OFDMA-CDM does not effectively reduce SI, since it does not consider multiuser diversity. The proposed scheme allocates subchannels to the user who has largest minimum Carrier to Interference Ratio (CIR) since the conventional weight combining is done by minimum channel gain. By doing the proposed subchannel allocation, minimum CIR becomes high and each user can use good subchannels. Due to the effective multiuser diversity, demodulated symbols can be weighted by high channel gain. Since the proposed scheme can generate reliable demodulated symbols, the proposed scheme can reduce SI. The simulation results show that the proposed scheme can improve the BER performance.

Original languageEnglish
Title of host publicationPACRIM 2009 - 2009 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing
Pages262-267
Number of pages6
DOIs
Publication statusPublished - 2009 Dec 1
EventPACRIM 2009 - 2009 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing - Victoria, BC, Canada
Duration: 2009 Aug 232009 Aug 26

Publication series

NameIEEE Pacific RIM Conference on Communications, Computers, and Signal Processing - Proceedings

Other

OtherPACRIM 2009 - 2009 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing
CountryCanada
CityVictoria, BC
Period09/8/2309/8/26

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ASJC Scopus subject areas

  • Signal Processing
  • Computer Networks and Communications

Cite this

Matsui, N., Mutou, K., Iijima, S., & Sasase, I. (2009). Weight combining and subchannel allocation to reduce self interference in OFDMA-CDM system. In PACRIM 2009 - 2009 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing (pp. 262-267). [5291363] (IEEE Pacific RIM Conference on Communications, Computers, and Signal Processing - Proceedings). https://doi.org/10.1109/PACRIM.2009.5291363