Pulse or digital communications – Spread spectrum – Direct sequence
Reexamination Certificate
2007-08-20
2009-10-06
Ha, Dac V (Department: 2611)
Pulse or digital communications
Spread spectrum
Direct sequence
C375S220000, C375S267000, C375S285000, C375S299000, C370S278000, C370S282000, C370S465000, C455S501000, C455S067130, C455S103000, C455S114300, C455S126000
Reexamination Certificate
active
07599420
ABSTRACT:
A system and method are described for compensating for frequency and phase offsets in a multiple antenna system (MAS) with multi-user (MU) transmissions (“MU-MAS”). For example, a method according to one embodiment of the invention comprises: transmitting a training signal from each antenna of a base station to one or each of a plurality of wireless client devices, one or each of the client devices analyzing each training signal to generate frequency offset compensation data, and receiving the frequency offset compensation data at the base station; computing MU-MAS precoder weights based on the frequency offset compensation data to pre-cancel the frequency offset at the transmitter; precoding training signal using the MU-MAS precoder weights to generate precoded training signals for each antenna of the base station; transmitting the precoded training signal from each antenna of a base station to each of a plurality of wireless client devices, each of the client devices analyzing each training signal to generate channel characterization data, and receiving the channel characterization data at the base station; computing a plurality of MU-MAS precoder weights based on the channel characterization data, the MU-MAS precoder weights calculated to pre-cancel frequency and phase offset and/or inter-user interference; precoding data using the MU-MAS precoder weights to generate precoded data signals for each antenna of the base station; and transmitting the precoded data signals through each antenna of the base station to each respective client device.
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Forenza Antonio
Heath, Jr. Robert W.
Perlman Stephen G.
Speck John
van der Laan Roger
Blakely , Sokoloff, Taylor & Zafman LLP
Ha Dac V
Rearden LLC
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