Multiple code-set channel estimation method in time-slotted...

Details Multiple code-set channel estimation method in time-slotted... Multiple code-set channel estimation method in time-slotted...

2005-07-14

2008-10-07

Wang, Ted (Department: 2611)

Pulse or digital communications

Spread spectrum

Direct sequence

C375S144000, C375S147000, C375S340000, C370S210000, C370S335000, C370S342000

Reexamination Certificate

active

07433387

ABSTRACT:
A channel estimation method for multiple code-sets in a time-slotted CDMA system. The method includes: A) performing a single code-set channel estimation of the received signal of each code-set, respectively, to obtain an original channel estimation, and deciding whether the desired number of iterations is reached; if yes, outputting each single code-set channel estimate; otherwise, going to Step B; B) performing limited time decision for the original channel estimates, retaining taps of channel estimation that meet a certain condition, recovering the interference caused by the response of each code-set using the tap values; canceling the interference caused by the response of other code-sets in the received signal of each code-set to obtain a clean signal of each code-set; taking the clean signal of each code-set as the said received signal of each code-set; and returning to Step A. The method solves the channel estimation problem caused by response signals of multiple code-sets and improves performance of single-code-set channel estimation.

REFERENCES:
patent: 6996194 (2006-02-01), Pukkila et al.
patent: 7260056 (2007-08-01), Pan et al.
patent: 7289552 (2007-10-01), Kwak et al.
patent: 2001/0004390 (2001-06-01), Pukkila et al.
patent: 2002/0181557 (2002-12-01), Fujii
patent: 1304255 (2001-07-01), None
patent: 1107524 (2001-06-01), None

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