US 6,674,820 B1 · Receiver devices, systems and methods for receiving communication signals subject to colored noise

Abstract

Methods, systems and receiver devices are provided which may provide improved receiver performance in obtaining estimates of the complex-valued baseband channel in the presence of colored baseband noise. In various embodiments of the present invention, systems and methods are provided in which, over each synchronization signal period or other determinate information window, the channel coefficients and the color of the baseband noise are concurrently estimated. Thus, both the channel coefficients and the color of the noise are estimated, rather than assuming white noise, and channel coefficients may be provided that account for the color of the noise These estimates may be provided for each burst of a communication and may result in an improved channel estimate in the presence of colored noise. The baseband noise can become colored due to, for example, having a non-Nyquist receive filter, due to the presence of a colored co-channel interferer, or due to the presence of an adjacent channel interferer. The concurrent estimates of the color of the noise and channel coefficients may be provided iteratively or by selection of a best result among a plurality of candidate noise color assumptions.

Claims44

Dependent claims

A method for receiving a communication signal subject to colored noise over a communication channel, the method comprising the steps of:

receiving the communication signal including the colored noise;
determining a channel estimate for the communication channel using a generalized least squares algorithm based on the received signal, predetermined information associated with the received signal and an estimated characteristic of the colored noise;
and
generating a signal estimate for the received signal using the determined channel estimate.

1 more element

A method for receiving a communication signal subject to colored noise over a communication channel, the method comprising the steps of:

receiving the communication signal including the colored noise;
determining a channel estimate for the communication channel based on the received signal, predetermined information associated with the received signal and an auto-correlation of the colored noise;
and
generating a signal estimate for the received signal using the determined channel estimate;
and
wherein the step of determining a channel estimate for the communication channel comprises the steps of:
generating a plurality of candidate channel estimates wherein each of the plurality of candidate channel estimates is based on one of a plurality of candidate auto-correlations;
and
selecting one of the plurality of candidate channel estimates as the channel estimate.

6 more elements

A system for receiving a communication signal subject to colored noise over a communication channel, the system comprising:

means for receiving the communication signal including the colored noise;
means for determining a channel estimate for the communication channel based on the received signal, predetermined information associated with the received signal and an auto-correlation of the colored noise;
and
means for generating a signal estimate for the received signal using the determined channel estimate;
and
wherein the means for determining a channel estimate for the communication channel comprises:
means for generating an initial channel estimate based on an assumed auto-correlation, the received signal and the predetermined information;
means for generating an updated auto-correlation based on the initial channel estimate, the received signal and the predetermined information;
and
means for generating an updated channel estimate based on the updated auto-correlation.

7 more elements

A system for receiving a communication signal subject to colored noise over a communication channel, the system comprising:

means for receiving the communication signal including the colored noise;
means for determining a channel estimate for the communication channel based on the received signal, predetermined information associated with the received signal and an auto-correlation of the colored noise;
and
means for generating a signal estimate for the received signal using the determined channel estimate;
and
wherein the means for determining a channel estimate for the communication channel further comprises:
means for generating a plurality of candidate channel estimates wherein each of the plurality of candidate channel estimates is based on one of a plurality of candidate auto-correlations;
and
means for selecting one of the plurality of candidate channel estimates as the channel estimate.

6 more elements

Dependencies are inferred from the claim text.

Receiver devices, systems and methods for receiving communication signals subject to colored noise

Life of this patent

Receiver devices, systems and methods for receiving communication signals subject to colored noise

Life of this patent

Abstract

Claims44