Telecommunications – Transmitter and receiver at separate stations – With control signal
Reexamination Certificate
2006-10-03
2010-06-29
Maung, Nay A. (Department: 2618)
Telecommunications
Transmitter and receiver at separate stations
With control signal
C455S562100, C455S067110, C370S334000, C370S318000
Reexamination Certificate
active
07747225
ABSTRACT:
A subscriber unit (104) with multiple receive antennas (160, 162) and a single transmit antenna (160) derives beamforming weights to be used at a base station (102) with multiple transmitting antennas (602, 604, 606, and608). The downlink beamforming weights are derived at the subscriber unit (104) from a prior downlink transmission from the base station (102) to the subscriber device (104) and an uplink sounding signal is used to carry derived downlink beam forming weights to the base station (102). Downlink antenna specific pilots (without weight) are used at the subscriber device (104) to determine the beamforming weights. Decimated sounding signals, where the number of sounding subcarriers is at least the same as the number of antennas at the base station (102), allow multiple users to sound at the same time.
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IEEE Std. 802.16e—2005 and IEEE Std 802.16—2004/Cor 1-2005, IEEE Standard for Local and Metropolitan area networks, Part 16: Air Interface for Fixed and Mobile Broadband Wireless Access Systems, Amendment 2: Physical and Medium Access Control Layers for Combined Fixed and Mobile Operation in Licensed Bands and Corrigendum 1, IEEE Std 802.16-2005-Approved Dec. 7, 2005, IEEE Std 802.16-2004/Cor 1-2005-Approved Nov. 8, 2005, Section 8.4.6.2.7.
Benes Stanley J.
Ghosh Amitava
Tan Jun
Wang Fan
Maung Nay A.
Motorola Inc.
Wendell Andrew
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