Pulse or digital communications – Systems using alternating or pulsating current
Reexamination Certificate
2008-05-20
2008-05-20
Payne, David C. (Department: 2611)
Pulse or digital communications
Systems using alternating or pulsating current
C375S296000, C375S346000
Reexamination Certificate
active
07376192
ABSTRACT:
A method is described herein for reducing the number of feedback bits needed to send channel state information over a feedback channel from a receiving unit (e.g., mobile terminal, base station) to a transmitter unit (e.g., base station, mobile terminal) in a wireless communication system. In the embodiment, the receiver unit is capable of performing the following steps: (1) receiving a pilot signal from a transmit antenna located at a transmitter unit; (2) analyzing a channel tap associated with the transmit antenna and exploiting the temporal correlations of the channel tap to generate the following (i) a delta-modulated feedback bit indicative of a real part of a complex coefficient of the channel tap associated with the transmit antenna and (ii) a delta-modulated feedback bit indicative of an imaginary part of the complex coefficient of the channel tap associated with the transmit antenna; and (3) sending the two feedback bits over a feedback channel to the transmitter unit which analyzes the two feedback bits, and other feedback bits corresponding to other channel taps of this and other transmit antennas, to optimize the subsequent transmission of data to the receiver unit.
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Koorapaty Havish
Krasny Leonid
Ramesh Rajaram
Burleigh Roger S.
Nguyen Leon-Viet Q
Payne David C.
Telefonaktiebolaget L M Ericsson (publ)
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