UC Riverside

For four (or more) transmitters, a new design of

differential space-time block code allowing symbol-wise decoding

is presented in this letter. The new design not only has the

minimum (symbol-wise) decoding complexity as that by Yuen,

Guan and Tjhung (YGT) but also yields a lower error rate. While

the YGT code uses a specially designed symbol constellation, the

new code uses a conventional QAM with a rotation. At a high

data rate such as 3bps/Hz, the new design with symbol-wise

decoding complexity can even yield a lower error rate than the

code by Zhu and Jafarkhani that has the pair-wise decoding

complexity