Orthogonal frequency-division multiplexing . (OFDM) has been utilized in various communication sysfems because of its ability to compensate for niultipath channels using simple low-complexity equalizers. However: the performance of OFDMsysfertts can still be compromised due to adjacent channel and cochannel interjerence. In this paper.we investigate the performance of an adaptive beanforming algorithm for an OFDM system based on the constant modulus (CM) array. We consider this blind technique for a wireless local area nehvork such as the IEEE 802.IIa standard. The algorithm exploits the constant ntodulusproperfy of the low-rare OFDM data carriers, and we show that it can also be used for the nonconstanf modulus constellations at higher data rates. We consider the case where cochannel users become active part way into the transmitted packet such that new beanformer weights should be computed to null these interfering signals.
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