US 7,321,646 B2 | ||
Methods and apparatus for pre-filtering a signal to increase signal-to-noise ratio and decorrelate noise | ||
Huseyin Arslan, Tampa, Fla. (US); Abdulrauf Hafeez, Cary, N.C. (US); Rajaram Ramesh, Cary, N.C. (US); and Dennis Hui, Cary, N.C. (US) | ||
Assigned to Telefonaktiebolaget LM Ericsson (publ), Stockholm (Sweden) | ||
Filed on Nov. 18, 2003, as Appl. No. 10/716,085. | ||
Prior Publication US 2005/0105646 A1, May 19, 2005 | ||
Int. Cl. H04B 1/10 (2006.01) |
U.S. Cl. 375—346 [375/148] | 6 Claims |
1. A method of receiving a signal from a multiple-input-multiple-output (MIMO) communication channel having a plurality of
input channels and a plurality of output channels, the method comprising the steps of:
generating initial taps that represent an impulse response estimate of the MIMO communication channel;
generating prefilter taps based on the initial taps:
generating output channel taps based on the generated initial taps and the generated prefilter taps;
pre-filtering the received signal using the generated prefilter taps to generate an output signal, the output signal comprising
a signal component and a noise component, which filtered noise affecting the output channels are mutually independent; and
selecting the prefilter taps generated from the generated initial taps by calculating a maximized ratio of signal energy to
noise energy (SNR) in some of the output channel taps in relation to a weighted sum of ratios of signal energy in other of
the output channel taps and energy of the noise component of the output signal.
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