Li Liu

US Patent:

7539458, May 26, 2009

Filed:

Oct 23, 2006

Appl. No.:

11/584831

Inventors:

Hamid Jafarkhani - Irvine CA, US
Li Liu - Aliso Viejo CA, US

Assignee:

The Regents of the University of California - Oakland CA

International Classification:

H04B 1/00
H04B 15/00

US Classification:

455 631, 455 6711, 455 6716, 455 69, 455 91, 343368, 343754, 343753

Abstract:

A multiple antenna wireless system including a transmitter and a receiver comprises a reconfigurable large antenna array having a plurality of antennas. A plurality of RF chains in the transmitter is coupled to the reconfigurable large antenna array. A pilot assisted round robin channel estimation means tracks the fading channel; and an adaptive round robin transmit beamforming means beam forms the reconfigurable large antenna array. A method for multiple antenna wireless communication comprising the steps of tracking a plurality of fading channels in a reconfigurable large antenna array having a plurality of antennas using pilot assisted round robin channel estimation to selectively couple a plurality of RF chains in the transmitter to the reconfigurable large antenna array, and adaptively, round-robin transmit beamforming the reconfigurable large antenna array.

US Patent:

7599419, Oct 6, 2009

Filed:

Jan 12, 2006

Appl. No.:

11/332019

Inventors:

Hamid Jafarkhani - Irvine CA, US
Li Liu - Aliso Viejo CA, US

Assignee:

The Regents of the University of California - Oakland CA

International Classification:

H04B 1/00

US Classification:

375137, 375135, 375229, 375261, 375265, 375267

Abstract:

A method for multiple-input-multiple-output (MIMO) wireless communication comprises the steps of generating inner and outer codes based on channel state information available at a transmitter and concatenating different inner codes with different outer codes; and using the generated concatenated inner and outer codes for wireless communication. The inner and outer codes are based on channel phase information at the transmitter or channel feedback. High-performance trellis codes or block codes for use in cellular networks are illustratively described. The space-time trellis codes are generated by set partitioning on a plurality of classes of signal designs to generate a series of inner codes, each of the series of inner codes being optimized by channel phase feedback, and concatenating each inner code with a multiple trellis coded modulated outer code to provide a complete space-time trellis code as a cophase space-time trellis code.

US Patent:

7912142, Mar 22, 2011

Filed:

Apr 4, 2008

Appl. No.:

12/062650

Inventors:

Jun Ma - Irvine CA, US
Nabil Yousef - Foothill Ranch CA, US
Li Liu - Aliso Viejo CA, US

Assignee:

Newport Media, Inc. - Lake Forest CA

International Classification:

H04B 15/00

US Classification:

375285, 375267, 375346, 375347

Abstract:

An apparatus, method, and system for reducing a C/N in an OFDM receiver using diversity combining techniques in the presence of ICI, wherein the apparatus comprises an encoded data estimator adapted to estimate data received in the OFDM receiver; a pair of ICI estimators operatively connected to the encoded data estimator and adapted to calculate an inter-carrier-interference term of the data; and a pair of diversity combining equalizers adapted to compensate multi-path interference of the data, wherein a first one of the diversity combining equalizers is operatively connected to the encoded data estimator, and a second one of the diversity combining equalizers is operatively connected to the pair of ICI estimators. The diversity combining equalizer may comprise a MRC diversity combining equalizer. Preferably, the encoded data estimator, the pair of ICI estimators, and the pair of diversity combining equalizers are implemented on a DVB-T/H diversity SoC.