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Matched filter

A matched filter and selector technology, applied in electrical components, multiplex communication, transmission systems, etc., can solve problems such as unrealizable layout

Inactive Publication Date: 2003-10-15
FUJITSU LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For this reason, the circuit is excessively concentrated from the point of view of circuit structure or layout, making this layout impossible

Method used

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Embodiment Construction

[0071] Hereinafter, various embodiments of the present invention will be described with reference to the accompanying drawings.

[0072] (A) Description of one embodiment of the present invention

[0073] figure 1 is a block diagram of the matched filter used in the present invention. Such as figure 1 The matched filter shown includes a CDMA controller 10 , a spread spectrum data path unit 8 , a spread spectrum data path input control unit 9 , a spread spectrum code setting unit 6 and a calculation unit 5 .

[0074] For the sake of convenience of the description hereinafter, specific numerical values ​​used in the matched filter 11 to which the present invention is applied are listed below. The number of taps is T=256, corresponding to the length of the spreading code used. The number O of oversampling is the number of oversampling performed in one chip duration, and O=4 is set. The bit number D of the spread spectrum data path represents the bit number equal to the dat...

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Abstract

In a matched filter, a spread data path unit holds inputted spread data, a multiplier unit multiplies an output of the spread data path unit by a spreading replica code, and an adder unit adds results of the multiplication and outputs an added result. The spread data path unit comprises a first selector being able to selectively output the spread data, a plurality of sub spread data path units each having a plurality of latch circuits temporarily holding the spread data from the first selector, and a second selector being able to selectively output outputs from the sub spread data path units, whereby a circuit scale of the spread data path unit is decreased.

Description

technical field [0001] The present invention relates to a matched filter in a wireless receiver suitable for direct sequence code division multiple access. Background technique [0002] In Direct Sequence Code Division Multiple Access (DC-CDMA [Direct Sequence Code Division Multiple Access]), the transmitter modulates the data code mainly by, for example, QPSK (Quadrature Phase Shift Keying), spreads its bandwidth with a spreading code and transmits the data code. On the other hand, the receiver performs cross-correlation using the same spreading code as in the transmitter, detects the peak of the correlation value, performs acquisition and tracking, and performs demodulation using correlation detection. [0003] Fig. 11(a) is a transmission unit of a wireless terminal in a CD-CDMA system using QPSK. In the transmitting unit of the DC-CDMA wireless terminal shown in Figure 11 (a), the data code is carried out QPSK modulation in the main modulation unit 30a, and the bandwid...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03H17/02H04B1/707H04B1/7093
CPCH04B1/7093H04B2201/70707
Inventor 陈奔内岛诚
Owner FUJITSU LTD
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