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Performance Analysis of OFDM-CDMA Systems using Space-Time Coding  

Kang, Mingoo (Dept. of Information Communication Engineering, Hanshin University)
Publication Information
Journal of the Korea Institute of Information and Communication Engineering / v.8, no.2, 2004 , pp. 265-275 More about this Journal
Abstract
In this paper, an OFDM-CDMA broadband system is considered for a possible candidate of fixed wireless broadband access network applications. With an emphasis on a preamble design for multi-channel separation, we address a channel estimation based on the time-domain windowing and its imperfectness in OFDM-based multiple-antenna transmission systems. By properly designing each preamble for multiple antennas to be orthogonal in the time domain, the channel estimation can be applied to the ETSI HlPERLAN/2 and IEEE-802.11a standards in the case of more than two transmit antennas. Also, an effect of diversity techniques on the performance of OFDM-CDMA based broadband wireless access networks is investigated and the maximum achievable diversity gain for a two-path Rayleigh fading environment is evaluated Simulation results show that the OFDM-CDMA system applying a space-time-frequency diversity with a full-rate full diversity code can give the diversity of D = 4 and D = 8 for both multi-user cases of maximum user and half user capacities, respectively.
Keywords
Broadband wireless access network; OFDM-CDMA; Diversity; Multi-channel separation; IEEE 802.11a.;
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