Channel estimation using intra-symbol frequency domain averaging
AssigneeZte Corporation
InventorsXin Xiao, Jianjun Yu
Life of this patent
Estimating the term…
Abstract
A channel estimation technique suitable for implementation at a digital communication receiver such as an optical signal receiver apparatus includes receiving, over a communication channel, a transmission comprising a sequence of modulated symbols, estimating, at multiple frequencies, estimated values of a channel transfer function of the communication channel and selectively revising the estimated values of channel transfer function by reducing glitches in the estimated values of the channel transfer function.
Claims20
A method of digital communication, implementable at a receiver-side in a digital communication network, comprising:
- receiving, over a communication channel, a transmission comprising a sequence of modulated symbols;
- estimating, at multiple frequencies, estimated values of a channel transfer function of the communication channel;
- and
- selectively revising the estimated values of channel transfer function by reducing glitches in the estimated values of the channel transfer function by:
- comparing, at the multiple frequencies, a corresponding estimated value of the channel transfer function with smoothened values of the channel transfer function at the multiple frequencies;
- and
- replacing, in a revised estimated channel transfer function, the corresponding estimated value of the channel transfer function with the smoothened value when a difference between the corresponding estimated value and the smoothened value is greater than a threshold.
An optical communication receiver apparatus, comprising:
- an optical receiver front end;
- a memory storing instructions;
- and
- a processor;
- wherein the processor reads instructions from the memory and implements a method of estimating a channel transfer function using a transmission signal received by the optical receiver front end, the method comprising:
- estimating, at multiple frequencies, estimated values of a channel transfer function of the communication channel;
- calculating, at a given frequency from the multiple frequencies, a first value based on a first number of estimated values of the channel transfer function at frequencies lower than the given frequency;
- calculating, at the given frequency, a second value based on a second number of estimated values of the channel transfer function at frequencies higher than the given frequency;
- calculating a candidate replacement value at the given frequency from the first value and the second value;
- comparing a difference between the candidate replacement value and the estimated value of the channel transfer function at the given frequency with a threshold;
- and
- replacing, in a revised estimated channel transfer function, the estimated value of the channel transfer function estimate with the candidate replacement value when the difference is greater than the threshold.
Dependencies are inferred from the claim text.