Delay profile making method and delay profile making apparatus
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorNaoyuki Kurihara
Life of this patent
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Abstract
A signal received under a multipath condition is buffered in storage memories 50a and 50b comprising two banks, and while overlap of write and read is allowed, the received data is supplied to matched filters 60a and 60b as much as possible, in a pipeline manner, and in-phase addition of four symbols per unit is performed in in-phase adders 80a and 80b. In the buffering in storage memories 50a and 50b, processor 40 adaptively changes the search period based on timing information acquired in advance.
Claims16
A method for creating a delay profile, comprising:
- receiving a CDMA radio signal under a multipath condition;
- buffering received data corresponding to a first path in a first bank of a storage memory during a first time interval;
- buffering received data corresponding to a second path in a second bank of the storage memory during a second time interval;
- simultaneous to buffering the received data corresponding to the second path, reading the received data corresponding to the first path from the first bank and supplying the received data corresponding to the first path to a correlation detector;
- performing a correlation detection of a symbol sequence using a correlation detector, said symbol sequence being included in said received signal and comprising a repetition of a unit pattern of +1 and −1;
- performing an in-phase addition using a correlation obtained by the correlation detection, in which said unit pattern is a processing unit;
- and
- performing a power calculation of the received signal utilizing a result of the in-phase addition and creating a delay profile.
An apparatus for creating a delay profile, comprising:
- a storage memory that buffers a CDMA radio signal received under a multipath condition by buffering received data corresponding to a first path in a first bank of the storage memory during a first time interval and buffering received data corresponding to a second path in a second bank of the storage memory during a second time interval;
- a correlation detector that performs a correlation detection of a symbol sequence included in said received CDMA radio signal and comprising a repetition of a unit pattern of +1 and −1;
- an in-phase adder that performs an in-phase addition using a correlation obtained by the correlation detection and adopting said unit pattern as a processing unit;
- a power calculator that performs a power calculation of the received signal utilizing a result of the in-phase addition and creates a delay profile, wherein the received data corresponding to the first path is read from the first bank and supplied to the correlation detector simultaneous to the received data corresponding to the second path being buffered in the second bank.
An apparatus for creating a delay profile, comprising:
- a storage memory that buffers a CDMA radio signal received under a multipath condition by buffering received data corresponding to a first path in a first bank of the storage memory during a first time interval, and buffering received data corresponding to a second path in a second bank of the storage memory during a second time interval;
- and
- a correlation detector that performs a correlation detection of a symbol sequence included in the received radio signal,
- wherein the received data corresponding to the first path is read from the first bank and supplied to the correlation detector simultaneous to the received data corresponding to the second path being buffered in the second bank.
Dependencies are inferred from the claim text.