Pulse or digital communications – Receivers – Automatic gain control
Reexamination Certificate
2002-07-29
2008-08-19
Tran, Khai (Department: 2611)
Pulse or digital communications
Receivers
Automatic gain control
Reexamination Certificate
active
07415083
ABSTRACT:
Automatic gain control (AGC) and synchronisation acquisition by a communication unit in a wireless communication system, e.g. a Universal Mobile Telecommunication System (UMTS) system, is described. AGC is performed using a downlink beacon function, for example a power level (Pbeacon) . Amplitude-equalising (limiting) is performed as part of synchronisation acquisition. Separate AGC processes are used for different stages of synchronisation acquisition. One AGC process uses a peak power (P(k)) of a received signal over a frame. Another AGC process uses a peak power (P(k)) of a received signal over only a portion of a frame, the portion comprising an initial synchronisation code. Another AGC process uses measurements of a received signal (P0(k)) taken in a downlink beacon timeslot. These processes tend to provide tolerance to a varying number of codes (M) transmitted on a timeslot-by-timeslot basis and robust initial synchronisation in the presence of strong uplink interference.
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Ipwireless, Inc.
Morrison & Foerster / LLP
Tran Khai
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