Frequency Diversity Scheme for OFDM Systems Based on Space-Time Block Coding

Sun Xiao-ying
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Abstract

Diversity gain and performance of wireless communication system can be improved by increasing the number of transmit or receive antenna. However, it is impractical to receiver because the size and cost of system can be greatly enhanced by increasing the number of antenna. A frequency diversity scheme for STBC-OFDM(Space-Time Block Coded Orthogonal Frequency Division Multiplexing) systems is proposed. Under the same SER (Symbol Error Rate) performance, the number of transmit antenna is not required to be increased because of using frequency diversity. The upper bound of PEP (Pairwise Error Probability) of the proposed scheme is analyzed. The coding and diversity gain is derived. The result shows that the improve 3 dB as STBC-OFDM systems with two transmit antennas and a single receive antenna and almost has the same performance as STBC-OFDM systems with four transmit antennas and a single receive antenna.
基于空时分组编码的OFDM系统分集方案
通过增加发射或接收天线的数量,可以提高无线通信系统的分集增益和性能。然而,由于增加天线的数量会大大增加系统的尺寸和成本,因此对接收机来说是不切实际的。提出了一种时空分组编码正交频分复用(STBC-OFDM)系统的频率分集方案。在相同的误码率性能下,由于使用了频率分集,不需要增加发射天线的数量。分析了该方案的成对误差概率(PEP)的上界。推导了编码增益和分集增益。结果表明,采用双发射天线、单接收天线的STBC-OFDM系统提高了3db,性能与采用四发射天线、单接收天线的STBC-OFDM系统基本相同。
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