Patent ID: 8204101
Filing Date: 2012-06-19
Classification: H04L

Abstract:
1. A noise estimation apparatus, comprising: an evaluation circuit, for determining which constellation point on a constellation diagram each received symbol in a communication signal corresponds to for purposes of generating a relevant evaluated symbol and outputting an evaluated signal; a first calculation circuit, coupled to the evaluation circuit, for generating an error output signal according to the communication signal and the evaluated signal, wherein the error output signal comprises a plurality of error calculation values respectively corresponding to errors between a plurality of received symbols in the communication signal and a plurality of relevant evaluated symbols in the evaluated signal; a second calculation circuit, coupled to the first calculation circuit, for adjusting at least a portion of the plurality of error calculation values in the error output signal to generate an adjusted error output signal; and a mean calculation circuit, coupled to the second calculation circuit, for performing mean calculation according to the adjusted error output signal to generate a noise estimation result.