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Receiver Design for MIMO OFDM Transmission over Time Variant Channels Tareq Y. Al-Naffouri Electrical Engineering Dept., King Fahd University of Petroleum and Minerals, Saudi Arabia
 

Summary: Receiver Design for MIMO OFDM Transmission over Time Variant Channels
Tareq Y. Al-Naffouri Electrical Engineering Dept., King Fahd University of Petroleum and Minerals, Saudi Arabia
Abstract-- This paper considers receiver design for space time block
coded MIMO OFDM transmission over frequency and time selective
channels. The receiver employs the expectation-maximization algorithm
for joint channel and data recovery. It makes collective use of the
data and channel constraints of the communication problem. The data
constraints include pilots, the cyclic prefix, the finite alphabet constraint,
and space-time block coding. The channel constraints include the finite
delay spread and frequency and time correlation as well as spatial
correlation. The channel estimation part of the receiver boils down to
an EM-based forward-backward Kalman filter. To avoid the latency and
storage associated with smoothing, we introduce a forward-only Kalman
that performas channel (and data) recovery with no latency. Simulations
show that the receiver outperforms other least-squares based iterative
receivers.
I. INTRODUCTION
Orthogonal frequency division multiplexing (OFDM) is a tech-
nique that enables high speed transmission over frequency selective
channels with simple equalizers. When MIMO is combined with

  

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

 

Collections: Engineering