CDMA receiving apparatus and CDMA receiving method
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsHideyuki Takahashi, Kazuyuki Miya, Hidetoshi Suzuki
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Abstract
A switch controlling section 204 controls a switching device 205 and a switching device 211 such that mode information, which shows that a current state of an apparatus is an initial synchronous mode, which is a power-on time, or a standby mode, which is a cell moving time, is input, correlation processing is performed by a matched filter 209 in the initial synchronous mode, and correlation processing is performed by a sliding correlator 210 in the standby mode. This makes it possible for a CDMA radio communication system to establish initial synchronization at high speed and to improve a reduction in current consumption.
Claims11
A CDMA receiving method comprising:
- (a) switching a path of a received signal when an apparatus implementing said method is powered on and when said apparatus moves across cells, and performing correlation processing of a scrambling code provided in the received signal using:
- a matched filter when said apparatus is powered on;
- and
- a sliding correlator when said apparatus moves across the cells, wherein said correlation processing provides a maximum correlation value when said apparatus is powered on based upon the received signal input to the matched filter and when said apparatus moves across cells based upon the received signal input to the sliding correlator, and
- (b) detecting one of a plurality of scrambling codes corresponding to said maximum correlation value;
- and
- (c) identifying the one scrambling code detected in step (b) as a scrambling code of a base station apparatus with which to establish communication.
A CDMA receiving apparatus comprising:
- a matched filter and a sliding correlator that each perform correlation processing of a scrambling code provided in a received signal;
- a switching control section that performs switching control such that during an initial synchronization mode the received signal is input to the matched filter, and during a wait mode the received signal is input to the sliding correlator;
- and
- a peak detecting section that detects one of a plurality of scrambling codes corresponding to a maximum correlation value output alternatively from (i) the matched filter during the initial synchronization mode and (ii) the sliding correlator during the wait mode.
A communication terminal apparatus having a CDMA receiving apparatus, said CDMA receiving apparatus comprising:
- a correlation processing section comprising a matched filter and a sliding correlator that each perform correlation processing of a scrambling code provided in a received signal;
- a switching control section that performs switching control such that during an initial synchronization mode the received signal is input to the matched filter, and during a wait mode the received signal is input to the sliding correlator;
- and
- a peak detecting section that detects one of a plurality of scrambling codes corresponding to a maximum correlation value output alternatively from (i) the matched filter during the initial synchronization mode and (ii) the sliding correlator during the wait mode.
Dependencies are inferred from the claim text.