Scattered pilot and filtering for channel estimation

Details Scattered pilot and filtering for channel estimation Scattered pilot and filtering for channel estimation

2002-06-21

2008-10-14

Backer, Firmin (Department: 2616)

Multiplex communications

Generalized orthogonal or special mathematical techniques

C455S562100

Reexamination Certificate

active

07436757

ABSTRACT:
Methods of improving channel estimation are described, in which pilot symbols are inserted into orthogonal frequency division multiplexing (OFDM) frames at an OFDM transmitter having at least one transmitting antenna, wherein for the or each antenna, historical data regarding channel conditions is obtained so that the scattered pilot symbols are inserted in a scattered pattern dependent upon said historical data. Alternatively, or in addition, an adaptive channel estimation filter is used whose parameters are selected according to analysis of historical data regarding channel conditions.

REFERENCES:
patent: 6654429 (2003-11-01), Li
patent: 6760388 (2004-07-01), Ketchum et al.
patent: 7006848 (2006-02-01), Ling et al.
patent: 7092436 (2006-08-01), Ma et al.
patent: 2002/0181390 (2002-12-01), Mody et al.
patent: 2003/0007553 (2003-01-01), Fifield
patent: 2003/0072254 (2003-04-01), Ma et al.

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