Multiplex communications – Communication techniques for information carried in plural... – Combining or distributing information via frequency channels
Reexamination Certificate
2005-10-13
2008-12-30
Nguyen, Duc (Department: 2617)
Multiplex communications
Communication techniques for information carried in plural...
Combining or distributing information via frequency channels
C370S343000, C370S208000, C455S452200, C455S226300, C455S267000, C455S296000, C455S101000, C375S348000
Reexamination Certificate
active
07471702
ABSTRACT:
Base stations transmit strip signals using strip signal segments and self supporting modulation scheme techniques facilitating rapid channel estimate. A strip segment occupies one OFDM symbol time interval and uses a set of downlink tones; some, e.g., half, of the tones are left unused facilitating SIR measurement. The strip segments are advantageously timed to correspond to uplink access intervals in which connected wireless terminals do not typically transmit uplink signals. Connected wireless terminals including: multiple antennas used in combination, an antenna duplex module, single RF receiver chain and single RF transmitter chain, switch antenna coefficient combinations based on strip signal segment timing. The wireless terminal determines an independent downlink channel quality measurement, e.g., SNR and/or SIR for each strip signal segment and for on-going non-strip signaling. The wireless terminal compares channel quality measurements and selects an antenna coefficient combination to be used during non-strip signaling intervals obtaining very good antenna gain.
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Lane Frank A.
Laroia Rajiv
Li Junyi
Addy Anthony S
Jenckes Kenyon S.
Nguyen Duc
QUALCOMM Incorporated
Rouse Thomas R.
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