Cancellation systems for multicarrier transceiver arrays

Details Cancellation systems for multicarrier transceiver arrays Cancellation systems for multicarrier transceiver arrays

2006-06-27

2009-10-20

Pham, Chi H. (Department: 2416)

Multiplex communications

Generalized orthogonal or special mathematical techniques

Particular set of orthogonal functions

C370S210000, C370S328000, C455S063100, C375S147000, C375S350000

Reexamination Certificate

active

07606137

ABSTRACT:
Frequency-dependent cancellation separates a plurality of interfering signals received by a plurality of receivers. Received wideband single-carrier signals or multicarrier signals are separated into a plurality of narrowband subcarriers. Sub-carrier frequencies and frequency-band characteristics may be selected with respect to channel characteristics (e.g., coherence bandwidth, interference, etc.). A cancellation circuit provides complex weights to the sub-carrier components. Weighted components associated with each sub-carrier frequency are combined to separate a plurality of interfering signals. Optionally, a plurality of the separated subcarriers may be combined to reconstruct at least one transmitted single-carrier signal from a plurality of frequency components. Combining may include decoding, such as to reconstruct a coded sequence of data symbols transmitted via direct-sequence coding, code division multiple access (CDMA), multicarrier CDMA, carrier interferometry (CI), CI coding, or coded orthogonal frequency division multiplexing.

REFERENCES:
patent: 5357257 (1994-10-01), Nevin
patent: 6166689 (2000-12-01), Dickey et al.

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