US 2016/0261433 A1 · CHANNEL ESTIMATION SYSTEM FOR WIRELESS COMMUNICATION SYSTEM

Abstract

A receiver circuit for estimating a state of an uplink channel between a wireless communication unit and a base station in a wireless communication system computes a conditioned Channel Impulse Response (CIR), the amount of conditioning being based on the noise present in the channel. A CIR and a Noise Variance are estimated from a Sounding Reference Signal received from the wireless communication unit. The estimated CIR is conditioned by comparing it with an adaptive threshold value selected from a look up table that lists threshold values against Noise Variance values. The threshold value further conditions the CIR to eliminate noise and interference. The conditioned CIR is converted into the frequency domain and used to provide a channel gain estimate which, together with noise estimates, is used to determine a Signal to Interference Noise Ratio (SINR) for the channel.

Claims16

Dependent claims

A method for estimating a state of an uplink channel between a wireless communication unit and a base station in a wireless communication system, the method comprising:

at the base station, receiving a reference signal transmitted by the wireless communication unit;
estimating a channel impulse response (CIR) for the uplink channel from the received reference signal;
estimating a value of a channel noise parameter for the uplink channel;
comparing the value of the estimated channel noise parameter value with a list of channel noise parameter values stored in a table of channel noise parameter values versus threshold values;
selecting a threshold value corresponding to the estimated channel noise parameter value;
and
comparing the selected threshold value with the estimated CIR to produce a conditioned CIR.

4 more elements

A receiver circuit for estimating a state of an uplink channel between a wireless communication unit and a base station in a wireless communication system, the receiver circuit comprising:

a signal processor;
and
a memory operably coupled to the signal processor and pre-configured with a table of channel noise parameter values versus threshold values,
wherein the signal processor includes:
a first signal processing circuit for receiving a reference signal transmitted by the wireless communication unit, and estimating a channel impulse response (CIR) for the uplink channel from the received reference signal;
a second signal processing circuit for estimating a value for a channel noise parameter for the uplink channel;
and
a third signal processing circuit for comparing the estimated channel noise parameter value with the channel noise parameter values stored in the table and selecting a threshold value corresponding to the estimated channel noise value, and comparing the selected threshold value with the estimated CIR to produce a conditioned CIR.

5 more elements

Dependencies are inferred from the claim text.

Channel estimation system for wireless communication system

Life of this patent

Channel estimation system for wireless communication system

Life of this patent

Abstract

Claims16