Patent ID: 7634000

Claim:
An estimator of Signal to Noise and Interference Ratio (SINR), said estimator receiving a symbol stream which includes at least two preambles, each said preamble comprising a plurality L of symbols and occupying a first time interval, said estimator having: a delay element coupled to said symbol stream and producing an output from said symbol stream which is delayed substantially equal to said first time interval; a conjugator coupled to said symbol stream and producing a conjugated output; a first multiplier forming a product from said conjugated output and said delayed symbol stream, said first multiplier coupled to a first accumulator operating over said first time interval, thereafter coupled to a phase finder for generating a magnitude which may be scaled by the number of samples in said first time interval, thereby forming a value Cn; a second multiplier forming a product from said symbol stream and said conjugated output, said second multiplier coupled to a second accumulator for summing previous 2L samples, thereafter scaling the result by 2L to form a value En; forming a noise estimate by subtracting said value Cn from said value En.