System and method for interference cancellation in a wireless communication receiver
First Claim
1. A method of improving performance in a wireless communication receiver comprising the steps of:
- receiving a known signal at the receiver that is impaired by signal disturbance that includes non-Gaussian interference;
performing channel estimation to obtain a channel estimate based on the known signal and modeling the probabilistic characteristics of the non-Gaussian interference, comprising the steps of;
a) modeling the signal disturbance as Gaussian and non-Gaussian disturbance components by generating a disturbance estimate for the signal disturbance as
1) a first, non-Gaussian component, comprising generating one or more parameters to model a non-Gaussian probability distribution function associated with the non-Gaussian interference, wherein the one or more parameters are based on knowledge of a signal type associated with the non-Gaussian interference, and
2) a second. Gaussian component; and
,b) performing channel estimation based on the disturbance estimate; and
, detecting an unknown signal received at the receiver using the channel estimate.
1 Assignment
0 Petitions
Accused Products
Abstract
A communication receiver improves its channel estimation performance, its equalization performance, or both, by modeling the non-Gaussian characteristics of a dominant source of interference in a received signal. That is, rather than using Gaussian-based modeling, the receiver generates signal disturbance estimates using a probabilistic model representative of the non-Gaussian interference in a received signal, such as adjacent channel or co-channel signal interference in mobile station operating within a wireless communication network. The receiver may use such non-Gaussian interference modeling responsive to detecting such interference in the received signal and may match its disturbance model to the detected interference. Further, where signal disturbance is predominantly Gaussian in nature, the receiver may switch to a Gaussian disturbance model.
-
Citations
24 Claims
-
1. A method of improving performance in a wireless communication receiver comprising the steps of:
-
receiving a known signal at the receiver that is impaired by signal disturbance that includes non-Gaussian interference; performing channel estimation to obtain a channel estimate based on the known signal and modeling the probabilistic characteristics of the non-Gaussian interference, comprising the steps of; a) modeling the signal disturbance as Gaussian and non-Gaussian disturbance components by generating a disturbance estimate for the signal disturbance as
1) a first, non-Gaussian component, comprising generating one or more parameters to model a non-Gaussian probability distribution function associated with the non-Gaussian interference, wherein the one or more parameters are based on knowledge of a signal type associated with the non-Gaussian interference, and
2) a second. Gaussian component; and
,b) performing channel estimation based on the disturbance estimate; and
, detecting an unknown signal received at the receiver using the channel estimate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
-
-
15. A wireless communication receiver comprising:
-
a receiver front-end to obtain a received signal from a received transmit signal; a disturbance estimator to generate a disturbance estimate that models the probability characteristics of non-Gaussian interference impairing the received signal, comprising a receive processing circuit configured to; generate a disturbance estimate for the non-Gaussian interference based on an initial channel estimate and a probabilistic model of the non-Gaussian interference; and generate a residual signal based on the received signal and the disturbance estimate; and a channel estimator to generate a channel estimate for the received signal based on the disturbance estimate, wherein the channel estimator is configured to compute a revised channel estimate using the residual signal and y obtain an error signal characterizing a channel estimate error, and the disturbance estimator is configured to compute a variance or covariance estimate and thereby update the disturbance estimate for subsequent generation of the residual signal and revision of the channel estimate. - View Dependent Claims (16, 17, 18, 19)
-
-
20. A wireless communication receiver comprising:
-
a receiver front-end to obtain a received signal from a received transmit signal, wherein the received signal is impaired by signal disturbance including non-Gaussian interference; a disturbance estimator to generate a disturbance estimate for the received signal based on modeling the probability characteristics of the non-Gaussian interference, comprising; a first estimation circuit to generate a first, non-Gaussian component of the disturbance estimate based on modeling the probability distribution function of the non-Gaussian interference; and a second estimation circuit to generate a second, Gaussian component of the disturbance estimate; and an equalizer to generate a sequence estimate for the received signal based on an equalizer metric that includes a correction term based on the disturbance estimate. - View Dependent Claims (21, 22, 23, 24)
-
Specification