Method and apparatus for post-detection maximum ratio...

Details Method and apparatus for post-detection maximum ratio... Method and apparatus for post-detection maximum ratio...

2005-01-11

2005-01-11

Nguyen, Chau (Department: 2663)

Multiplex communications

Generalized orthogonal or special mathematical techniques

Particular set of orthogonal functions

C455S066100, C455S273000

Reexamination Certificate

active

06842421

ABSTRACT:
A novel antenna diversity technique for OFDM receivers is disclosed. A method and apparatus are disclosed for combining in the frequency domain the various signals received on each of the multiple antennas in an OFDM communication system. At the OFDM transmitter, the transmitted signal is differentially encoded over frequency, as opposed to time, to differentially encode the transmitted signal in the frequency domain with respect to consecutive bins (OFDM sub-carriers). The OFDM receiver processes a signal received on a number of diversity branches and combines the received signals using a post-detection combining technique after differential decoding. Each frame is independently processed by a differential decoder and then delayed to align each symbol in a given frame. The post-detection combining of the frame data inherently scales the received samples and thereby implements an optimal maximum ratio combining mechanism. Unlike conventional maximum ratio combining techniques, the faded bins are scaled individually by the differential decoder, based on their own power levels rather than the overall power of the OFDM frame. Thus, bins with higher magnitudes will be weighted more heavily than bins having severe channel fading.

REFERENCES:
patent: 6151372 (2000-11-01), Yamamoto
patent: 6442211 (2002-08-01), Hampel et al.
patent: 6442222 (2002-08-01), Ghazi-Moghadam et al.
patent: 6487252 (2002-11-01), Kleider et al.

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