A computationally efficient method for estimating the channel impulse response for the IEEE 802.11b (WLAN)

In this paper a computationally efficient method for estimating the channel impulse response in the context of IEEE 802.11b WLAN standard that utilizes direct sequence spread spectrum technique is presented. This method introduces an approximation in the solution for channel impulse response that comprises the autocorrelation coefficient of the 11 chip barker sequence and cross correlation of barker sequence with the received signal. This approximation reduces the computational complexity significantly while maintaining the same performance level. The performance of the proposed method has been studied for various wireless indoor channel models and the effectiveness of the proposed method is demonstrated.