Four-Branch Open-Loop Transmit Diversity Based on STBC Group-Coherent Codes for OFDM-CDM Systems

Masaaki FUJII  

IEICE TRANSACTIONS on Communications   Vol.E89-B   No.1   pp.231-234
Publication Date: 2006/01/01
Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e89-b.1.231
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Wireless Communication Technologies
four-branch transmit diversity,  OFDM-CDM,  space-time block code,  group-coherent code,  

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This letter describes four-branch open-loop transmit diversity schemes that are based on group-coherent codes using space-time block codes (STBC-GCC), for orthogonal frequency-division multiplexing and code-division multiplexing (OFDM-CDM) systems. Open-loop STBC-GCC is designed for transmitting control data by two-dimensional spreading, which is achieved by applying two distinct Walsh-Hadamard (WH) codes within the same mother-code group to two different groups of transmit antennas. The simulation results demonstrated that open-loop STBC-GCC applied to two-dimensional spreading provides space diversity gains and frequency diversity gains. It can therefore be concluded that open-loop STBC-GCC is suitable for transmitting common control data or broadcast data via two-dimensional spreading OFDM-CDM.