William J. Hillery

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This paper introduces an open-loop transmit diversity method called Finite Impulse Response Cyclic Shift Diversity (FIR-CSD) for broadband mobile OFDM systems. Ordinary CSD operates in OFDM by cyclically shifting the same timedomain signal by different cyclic shift values on each transmit antenna branch. Unfortunately, in some channels (such as a line of(More)
It has been previously shown that the effects of error propagation in a decision feedback equalizer may be reduced by constraining the 2-norm of the feedback filter. This paper describes three algorithms for calculating the constrained equalizer based on a channel estimate. An iteration function is derived for the Karush-Kuhn-Tucker multiplier and the(More)
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