SYSTEM FOR CONVOLUTIONAL ECHO CANCELLATION BY ITERATIVE AUTOCORRELATION

摘要

System are provided for blind echo cancellation in wireless signal processors, such as for wireless repeaters (12). A first embodiment of the echo cancellation system (100a) provides iterative echo cancellation (142a) for white signals, with channel identification. A second embodiment of the echo cancellation system provides iterative echo cancellation (142a) for band-limited signals (18), without channel identification, through the determination of a the second order statistics of a signal. The echo cancellation systems are fast, and can be implemented using modern DSP processors for CDMA and broadband wireless communication systems. Analyses and simulations show that the echo cancellation systems can achieve echo cancellation of 40 dB or more at a modest computational cost of several hundred MMACs.