Patent ID: 8149965

Claim:
A level sensitive packet detector for a plurality of streams of quadrature baseband digitized samples, the level sensitive packet detector having: a stream factor for each said stream, whereby a stream with a greater signal to noise ratio (SNR) has a stream factor which is greater than a stream with a lower SNR; a plurality of stream computers, each stream computer having a signal input coupled to a respective said stream of quadrature baseband samples and generating a first output and a second output, each said stream computer having: a first in first out (FIFO) buffer having an input coupled to an associated said signal input and producing an output which is delayed from said signal input; a signal correlator multiplying said signal input with said FIFO output after conjugating one of said FIFO output or said signal input, thereafter scaling the result of said multiplication by the associated said stream factor to form said first output; a signal plus noise correlator multiplying said signal input by a conjugated said signal input, thereafter scaling the multiplication result by the associated said stream factor to form said second output; a signal accumulator summing said first output of each said stream computer; a signal plus noise accumulator summing said second output of each said stream computer; a comparator asserting a packet detect output when said signal accumulator output is greater than said signal plus noise accumulator output by a threshold determined by the strongest one of said stream factors.