Wireless Communications Systems and Methods

摘要

Methods and systems that enhance interference cancellation in communication channels are described. Specialized time domain training sequences and simple cross correlation are used to obtain a channel estimate for use in stacked carrier beamforming and OFDM based spatial beamforming. In certain embodiments, a time domain preamble sequence is provided as an alternative to the conventional frequency domain preamble sequence. The use of a time domain preamble can increase channel estimation performance, facilitating cancellation of co-channel interference. Embodiments include generating a training sequence preamble in the time domain, computing a frequency domain response of the channel using an estimate of its time domain impulse response, and using the frequency domain response of the channel to calculate channel estimation from a cross correlation of data received from the channel against the training sequence.

主权项

1. A wireless communications system for improving performance of a communications channel with co-channel interference, comprising:
a training sequence generator configured to produce a training sequence preamble in the time domain; and a processor configured to compute beamforming weights over all frequencies of the channel based on channel estimation, wherein the computing includes interpolating the beamforming weights as a function of frequency, performing Fast Fourier Transform (FFT) on the training sequence preamble, time domain impulse response of the channel and data received over the channel having co-channel interference.