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简要介绍B3G系统需要支持高容量、高质量和高移动性的数据传输要求,而OFDM(orthogonal frequency division multiplexing,正交频分复用)技术由于非常适合于高速数据传输而成为B3G系统的热点候选传输技术。然而在高速移动环境中,OFDM系统的子载波间干扰是影响系统性能的主要因素,为了使OFDM技术更好地应用于B3G系统,对高速移动环境中OFDM系统的接收技术进行了研究,提出了一种基于EM算法的联合信道估计与检测技术的迭代接收方案。仿真结果表明,提出的接收机算法可以大大降低子载波干扰。
Brief introduction B3G system needs to support high capacity, high quality and high mobility data transmission requirements, and OFDM (orthogonal frequency division multiplexing, orthogonal frequency division multiplexing, Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing) technology is a hot candidate for the B3G system because it is suitable for high-speed data transmission Transmission technology. However, in the high-speed mobile environment, the inter-subcarrier interference of OFDM system is the main factor affecting the system performance. In order to make OFDM technology better applied to B3G system, the receiving technology of OFDM system in high-speed mobile environment is studied, An Iterative Receive Scheme of Joint Channel Estimation and Detection Technique Based on EM Algorithm. Simulation results show that the proposed receiver algorithm can greatly reduce subcarrier interference.