A Novel 2-Dimensional Spreading Method for Down-Link OFDM-Code Division Multiplexing Systems

Myeon-gyun CHO
Hangyu CHO
Daesik HONG

Publication
IEICE TRANSACTIONS on Communications   Vol.E89-B    No.6    pp.1907-1910
Publication Date: 2006/06/01
Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e89-b.6.1907
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Wireless Communication Technologies
Keyword: 
2-dimensional spreading,  diversity,  OFDM-CDM,  

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Summary: 
In this letter, orthogonal frequency division multiplexing-code division multiplexing (OFDM-CDM) using a novel 2-dimensional spreading scheme is proposed as a candidate for a next-generation multiple access scheme. Full residual frequency diversity gain can be obtained with OFDM-CDM by adapting the proposed 2-dimensional spreading scheme with a novel frequency-hopping technique. Setting the frequency-hopping pattern in proper consideration of the coherent channel bandwidth allows us to exploit both the full frequency diversity and the time diversity in any channel environment.