Method and apparatus for Fast Fourier Transform based maximal ra

Details Method and apparatus for Fast Fourier Transform based maximal ra Method and apparatus for Fast Fourier Transform based maximal ra

1994-10-24

1996-08-27

Tse, Young T.

Pulse or digital communications

Receivers

Interference or noise reduction

375267, 455137, 455273, H04B 702, H04L 102

Patent

active

055508723

ABSTRACT:
A method and apparatus diversity-combine radio signals received from a plurality of branches (108, 214). Each radio signal comprises a plurality of subchannels (806). The radio signal from each branch (108, 214) is digitized (904) into digital samples that are converted (908, 910) into frequency domain signals (702, 712). Each frequency domain signal (702, 712) corresponds to a subchannel and a branch (108, 214). A weighting factor is determined (916) for each branch (108, 214) and each subchannel (806) from instantaneous signal energy and noise power calculated (912, 914) from the frequency domain signals (702, 712). The frequency domain signal (702, 712) corresponding to each branch (108, 214) and each subchannel (806) is multiplied (918) by the weighting factor therefor to produce weighted frequency domain signals corredponding to each branch and each subchannel. The weighted frequency domain signals that correspond to all the branches (108, 214) of each subchannel (806) are then combined (920) to produce a diversity-combined frequency domain signal for each subchannel (806).

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patent: 5367539 (1994-11-01), Copley
patent: 5450612 (1995-09-01), Chanroo et al.

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