摘要
An iterative receiver is proposed based on the EM (Expectation-Maximization)algorithm for an OFDM-SDMA (Orthogonal Frequency Division Multiplexing-Space Division Multiple Access) system. By using a few pilots in every OFDM symbol, both channel estimation and multiuser detection can be simultaneously obtained by iteration. The computer simulation results show this receiver can track channel variations and detect multiuser symbols for different number of users under time-varying multipath channels.
An iterative receiver is proposed based on the EM (Expectation-Maximization) algorithm for an OFDM-SDMA (Orthogonal Frequency Division Multiplexing-Space Division Multiple Access) system. By using a few pilots in every OFDM symbol, both channel estimation and multiuser detection can be simultaneously obtained by iteration. The computer simulation results show this receiver can track channel variations and detect multiuser symbols for different number of users under time-varying multipath channels.
基金
Supported by the National Natural Science Foundation of China (No. 60272079)
关键词
OFDM
SDMA
迭代接收机
信道估计
多用户检测
Orthogonal Frequency Division Multiplexing (OFDM)
Space Division Multiple Access (SDMA)
Expectation-Maximization(EM) algorithm
Channel estimation
Multiuser detection
