METHOD AND SYSTEM FOR SIGNAL DYNAMIC RANGE IMPROVEMENT FOR FREQUENCY-DIVISION DUPLEX COMMUNICATION SYSTEMS

摘要

Canceling distortion in the receive path of a radio is achieved by down-converting an RF transmit signal to cancel leakage and intermodulation noise in a receive path baseband or intermediate frequency signal. Cancelation may be combined with digital pre-distortion of the transmit signal. Processing may be applied to optimize cancelation. Further cancelation can be achieved by re-modulating the demodulated and error-corrected receive signal, and predicting distortion caused by the transmit path. The cancelation system may be calibrated using a test signal.

主权项

1. A method for canceling intermodulation noise in the radio receive path, the method comprising:
forwarding an RF transmit signal from a source between an up-converting mixer and an antenna in a radio transmit path to a down-converting mixer; down-converting the forwarded RF transmit signal; forwarding the down-converted transmit signal to the radio receive path; and canceling at least a portion of the intermodulation noise included in a receive path signal using the down-converted transmit signal to create an intermodulation-reduced receive path signal.