Pulse or digital communications – Systems using alternating or pulsating current – Plural channels for transmission of a single pulse train
Reexamination Certificate
2006-10-31
2006-10-31
Ha, Dac V. (Department: 2634)
Pulse or digital communications
Systems using alternating or pulsating current
Plural channels for transmission of a single pulse train
C375S141000, C375S347000, C375S350000, C370S319000, C370S465000, C370S497000, C455S066100, C455S296000
Reexamination Certificate
active
07130355
ABSTRACT:
In an environment where the transmission medium leading to the receiver is time-variant within a block of received signals, and where transmission medium has an finite impulse response extending over a number of symbols intervals, a receiver that includes a filter that, based on an estimate of the transmission channel, is controlled to have filter coefficients that minimize inter-carrier interference due to the intra-block time variations in the transmission medium. The estimate channel coefficients are determined from pilot signals and an interpolation process. When the receiver is an OFDM receiver, the pilot signals are advantageously selected to be in clusters that are equally spaced from each other in the time or the frequency domains. This approach applies to multiple antenna, as well as to single antenna arrangements, and to arrangements that do, or do not use space-time coding.
REFERENCES:
patent: 6711124 (2004-03-01), Khayrallah et al.
patent: 6898250 (2005-05-01), Lee et al.
patent: 6904107 (2005-06-01), Rached et al.
Al-Dhahir Naofal
Diggavi Suhas N.
Stamoulis Anastasios
AT&T Corp.
Brendzez Henry T.
Ha Dac V.
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