Improvement of AWGN Noise Power Estimation Algorithm for WCDMA Downlink
Yang Yan · Communications technology · 2009
The power of AWGN (Additive White Gaussian Noise) is a very important parameter for equalizers,and the performance of equalizers would decline if noise power is not precisely estimated. In this paper,a modified algorithm of AWGN noise power estimation is proposed. The improved algorithm makes use of the results from channel estimation to calculate the interference power of ISI (Inter Symbol Interference) and MUI (Multiple User Interference),and subtracts the interference power from the total noise power in the receiver,thus a proper noise power of AWGN is obtained. Simulation results indicate that the new method outperforms the former one in LMMSE (Linear Minimum Mean Square Error) equalizers. When BLER equals to 8 percent,there is an improvement by 1 dB.