Removal of ICI/ISI errors in frequency domain channel estimation for wireless repeaters

摘要

A method for estimating a feedback channel for a wireless repeater using frequency domain channel estimation estimates an error correction term using a most recent channel estimate and cancels the error correction term from a current block of the receive signal. Then, the feedback channel is estimated using frequency domain channel estimation and using a current block of the pilot signal and the corrected block of the receive signal. A channel estimate error term may also be estimated and subtracted directly from the channel estimate.

主权项

1. A method for estimating a feedback channel for a wireless repeater in a wireless communication system, the wireless repeater having a first antenna and a second antenna to receive a receive signal and transmit an amplified signal, the receive signal being a sum of a remote signal to be repeated and a feedback signal resulting from the feedback channel between the first and second antenna of the wireless repeater, the method comprising:
(a) selecting blocks of N samples of the amplified signal in a feedback loop of the repeater as a pilot signal; (b) selecting blocks of N samples of the receive signal; (c) estimating an error correction term using a most recent channel estimate; (d) canceling the error correction term from a current block of the receive signal to generate a corrected block of the receive signal; and (e) estimating the feedback channel between the first antenna and the second antenna using frequency domain channel estimation and using a current block of the pilot signal and the corrected block of the receive signal, the channel estimate obtained becoming the most recent channel estimate.