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Receiver Design for MIMO-OFDM Transmission over Time Variant Channels

Summary: Receiver Design for MIMO-OFDM Transmission
over Time Variant Channels
T. Y. Al-Naffouri, O. Awoniyi, O. Oteri, A. Paulraj
Information Systems Laboratory
Dept. of Electrical Engineering, Stanford University
Email: {nafouri,lawoniyi,koteri,apaulraj}@stanford.edu
Abstract-- This paper considers receiver design for Space Time
Block Coded MIMO OFDM transmission over frequency selective
time-variant channels. The receiver employs the expectation-
maximization (EM) algorithm for joint channel and data recov-
ery. It makes collective use of the data and channel constraints
that characterize the communication problem. The data con-
straints include pilots, the finite alphabet constraint, and space-
time block coding. The channel constraints include the finite delay
spread and frequency and time correlation. The receiver employs
an EM-based Kalman filter for channel estimation. The receiver
is able to recover the channel (which varies from one space-time
block to the next) and the data with no latency and to reduce
the number of pilots needed. Simulations show that the receiver
outperforms other least-squares based iterative receivers.


Source: Al-Naffouri, Tareq Y. - Electrical Engineering Department, King Fahd University of Petroleum and Minerals


Collections: Engineering