Interference Cancellation in Coexisting Wireless Local Area Networks

The interference in coexisting wireless local area networks (WLANs), can be viewed as a layered space-time (LST) structure, in which the number of access points (APs) is equal to the number of transmit antennas. Thus, the interference that is caused by APs from different vendors is equivalent to the interference between transmit antennas in LST architecture. This analogy can be further extended to the WLANs receiver strategy, so that receiver structures derived for LST architectures can be directly applied to mitigate against the interference between vendors. Therefore, in this paper, we propose the LST architecture receivers in the physical layer (PHY) to mitigate against the interference in coexisting WLANs. To improve the bit error rate (BER) performance further, a cross-layer design in both the PHY and medium access control (MAC) layers is also proposed. It is shown that the proposed receivers demonstrate superior performance to the standard receiver for WLANs