Method for interference and carrier power estimation and its application to automatic gain control and signal-to-interference-and-noise-ratio computation

摘要

A system and method are provided for estimating interference power at a receiver antenna in a communications systems receiver, in which an interference type signal associated with a received radio signal is detected, an in-band interference power associated with the received radio signal is determined, and an interference power at the antenna is estimated using the determined in-band interference power and the detected interference type. Estimating the interference power at the antenna includes interpolating the determined in-band interference power using scaling factors determined by the interference type signal associated with the received radio signal. The system and method determine in-band carrier power associated with the radio signal based on a channel estimate h(k), and the in-band interference information is based on interference samples I(n). In addition, an average total power, automatic gain control (AGC) setting, and signal-to-information-and-noise ratio can be determined by the system and method.

主权项

1. A method for estimating interference power present at a receiver antenna in a communications systems receiver, comprising:
detecting an interference type signal associated with a received radio signal; determining an interference power, measured at baseband, associated with the received radio signal; estimating an interference power present at the antenna using the determined baseband interference power and the detected interference type, wherein the step of estimating the interference power present at the antenna comprises:
interpolating the determined baseband interference power using scaling factors determined by the interference type signal associated with the received radio signal; determining carrier power, measured at baseband, associated with the radio signal based on a channel estimate h(k), and further wherein the baseband interference information is based on interference samples I(n); determining an average total power for the communications systems receiver at the receiver antenna, wherein the step of determining the average total power for the communications systems receiver at the receiver antenna comprises:
determining an averaged carrier power at the receiver antenna and an averaged interference power at the receiver antenna, wherein the averaged carrier power is based on an instantaneous carrier power value at the receiver antenna, and the averaged interference power is based on an instantaneous interference power value at the receiver antenna; andsumming the averaged carrier power and the averaged interference power to obtain the average total power for the communications systems receiver at the receiver antenna; determining an automatic gain control (AGC) setting based on the determined average total power, and determining a signal-to-noise-plus-interference ratio (SINR), wherein the SINR is equal to the ratio of the average carrier power at the receiver antenna to the average interference power at the receiver antenna.