Canceling narrowband interfering signals in a distributed antenna system

摘要

Canceling narrowband interfering signals in a distributed antenna system is provided. In one aspect, a cancellation sub-system includes a decimator module, a filter, an interpolator module, and a combiner module coupled to the uplink path and a reference path in parallel with the uplink path. The reference path includes the decimator module, the filter, and the interpolator module. The decimator module decimates a reference signal sampled from an uplink signal traversing an uplink path of the remote antenna unit. Each of the uplink signal and the reference signal includes a narrowband interfering signal component. The filter generates a cancellation signal from the reference signal by attenuating the reference signal outside a frequency band that includes the interfering signal component. The interpolator module interpolates the cancellation signal to a sampling rate of the uplink signal. The combiner module can subtract the cancellation signal from the uplink signal.

主权项

1. A cancellation sub-system for canceling narrowband interfering signal components in a remote antenna unit of a distributed antenna system, the cancellation sub-system comprising:
a decimator module configured for decimating a reference signal including a narrowband interfering signal component and sampled from an uplink signal including the narrowband interfering signal component and traversing an uplink path of the remote antenna unit; a filter communicatively coupled to the decimator module and configured for generating a cancellation signal from the reference signal by attenuating frequency components of the reference signal using a passband corresponding to a frequency band that includes the narrowband interfering signal component; an interpolator module communicatively coupled to the filter and configured for interpolating the cancellation signal to a sampling rate of the uplink signal traversing the uplink path; and a combiner module communicatively coupled to the uplink path and a reference path in parallel with the uplink path, wherein the reference path comprises the decimator module, the filter, and the interpolator module, wherein the combiner module is configured to subtract the cancellation signal traversing the reference path from the uplink signal traversing the uplink path.