Pulse or digital communications – Systems using alternating or pulsating current – Plural channels for transmission of a single pulse train
Reexamination Certificate
2005-07-15
2010-11-09
Liu, Shuwang (Department: 2611)
Pulse or digital communications
Systems using alternating or pulsating current
Plural channels for transmission of a single pulse train
C375S341000, C375S343000, C375S346000, C375S340000, C375S350000, C370S292000, C370S321000
Reexamination Certificate
active
07830976
ABSTRACT:
Estimation of channel characteristics and interference level in a time-varying multi-carrier multi-user systems is carried out concurrently. To perform the estimation, a multitude of data symbols and dedicated pilot symbols are transmitted over the channel. Next, an initial estimate value is selected for the interference level. The initial estimate value for the interference level is used together with the received pilot symbols to provide a first estimate of the channel. The first estimate of the channel is used to determine a new updated value for the interference level, which in turn, is used to update the value of the first estimate of the channel iteratively. The iterations continue until the iteratively updated values of the interference level and channel satisfy predefined limits. The data symbols and the final updated value of the channel are subsequently used to provide a second estimate for the channel.
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Agrawal Avneesh
Gore Dhananjay Ashok
Gorokhov Alexei
Keerthi Arvind Vijay
Braden Stanton C.
Liu Shuwang
Milikovsky Dmitry R.
QUALCOMM Incorporated
Yu Lihong
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