Intermodulation Cancellation of Third-order Distortion in an FDD Receiver

摘要

A transceiver device may include a transmit path that generates a modulated transmit signal based on a baseband signal, and a receive path that receives a receive signal, which is subject to third-order order distortion caused by intermodulation noise resulting from a continuous wave blocker intermodulating with transmit leakage from the transmit path. The transceiver may also include a compensation path that models portions of the transmit path and the receive path, and generates a replica signal representative of the third-order order distortion according to at least a specified function and the modeled portions of the transmit path and the receive path. The compensation path also filters the replica signal and subtracts the filtered replica signal from the receive signal to eliminate the third-order order distortion caused by the intermodulation noise. The filtering of the replica signal may be performed by programmable finite impulse response filters.

主权项

1. A transceiver device comprising:
a transmit path configured to generate a modulated transmit signal based on a baseband signal; a receive path configured to receive a receive signal, wherein the receive signal is subject to third-order distortion caused by intermodulation noise resulting from a continuous wave blocker intermodulating with transmit leakage from the transmit path; and a compensation path configured to:
model portions of the transmit path and the receive path;generate a replica signal representative of the third-order order distortion according to at least a specified function and the modeled portions of the transmit path and the receive path; andfilter the replica signal and subtract the filtered replica signal from the receive signal to eliminate the third-order distortion caused by the intermodulation noise.