Pulse or digital communications – Spread spectrum – Direct sequence
Reexamination Certificate
2007-08-20
2009-12-15
Ha, Dac V (Department: 2611)
Pulse or digital communications
Spread spectrum
Direct sequence
C375S220000, C375S267000, C375S285000, C375S299000, C370S278000, C370S282000, C370S465000, C455S501000, C455S067130, C455S103000, C455S114100, C455S126000
Reexamination Certificate
active
07633994
ABSTRACT:
A system for compensating for in-phase and quadrature (I/Q) imbalances for multiple antenna systems (MAS) with multi-user (MU) transmissions (defined with the acronym MU-MAS), such as distributed-input distributed-output (DIDO) communication systems, comprising multicarrier modulation, such as orthogonal frequency division multiplexing (OFDM). For example, one embodiment of the system comprises one or more coding modulation units to encode and modulate information bits for each of a plurality of wireless client devices to produce encoded and modulated information bits; one or more mapping units to map the encoded and modulated information bits to complex symbols; and a MU-MAS or DIDO IQ-aware precoding unit to exploit channel state information obtained through feedback from the wireless client devices to compute MU-MAS or DIDO IQ-aware precoding weights, the MU-MAS or DIDO IQ-aware preceding unit precoding the complex symbols obtained from the mapping units using the weights to pre-cancel interference due to I/Q gain and phase imbalances and/or inter-user interference.
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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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