Performance Comparison of Linear and Non Linear Interference Cancellation Techniques for 3.466 Gbps WLAN

The new WLAN standard IEEE802.11ac provides data rate up to 3.466Gbps by occupying 80MHz of bandwidth and eight spatial streams in modulation coding scheme index 9. However, these multiple streams configuration introduce dense interferences. This paper presents linear and non-linear techniques to cancel the interferences in very high data rate WLAN system. Those techniques were compared in term of performance and complexity. They are not only canceling the interference but also combining the multipath gain to obtain optimal signal to noise ratio. Zero Forcing (ZF) has the lowest complexity and performance. Minimum Mean Square Error (MMSE) considers the noise power to give better performance by low computation complexity. Maximum Likelihood Detection (MLD) gives the best performance by the cost of highest complexity, especially when deals with multiple streams. In the other side, other modern techniques, such as Sphere Detection and K-Best offer near performance to MLD by lower complexity. The comparison of those techniques was conducted under indoor channel model of IEEE802.11n Task Group.