Influence of Noisy Channel on Acoustic Echo Cancellation in Mobile Communication

In this paper, we investigate the influence of noisy channel on the performance of acoustic echo cancellation system. In the mobile communications, acoustic echo is mainly caused by the coupling between the loudspeaker and the microphone of the mobile device. So, an Acoustic Echo Canceller (AEC) should be used locally inside this device. This paper evaluates the performances of AEC, generally based on adaptive filtering, where the transmitted speech is encoded and decoded by AMR-WB (Adaptive Multi-Rate Wide Band) speech codec. The encoded speech is transmitted over a transmission channel modeled by AWGN (Additive White Gaussian Noise) and Rayleigh fading channel. The simulation results show the strong degradation of the AEC performances, due to the noisy channel.