Approximate best linear unbiased channel estimation for multi-antenna frequency selective channels with applications to digital TV systems
2004
We provide an iterative and a non-iterative channel impulse response (CIR) estimation algorithm for communication receivers with multiple-antenna. Our algorithm is best suited for communication systems which utilize a periodically transmitted training sequence within a continuous stream of information symbols, and the receivers for this particular system are expected work in a severe frequency selective multipath environment with long delay spreads relative to the length of the training sequence. The iterative procedure calculates the (semi-blind) Best Linear Unbiased Estimate (BLUE) of the CIR. The non-iterative version is an approximation to the BLUE CIR
estimate, denoted by a-BLUE, achieving almost similar performance,
with much lower complexity. Indeed we show that, with reasonable
assumptions, a-BLUE channel estimate can be obtained by using a
stored copy of a pre-computed matrix in the receiver which enables
the use of the initial CIR estimate by the subsequent equalizer
tap weight calculator. Simulation results are provided to
demonstrate the performance of the novel algorithms for 8-VSB ATSC
Digital TV system. We also provide a simulation study of the
robustness of the a-BLUE algorithm to timing and carrier phase
offsets.
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