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Symbol mapping and channelizing device of asynchronous CDMA communication system

A code division multiple access and communication system technology, applied in the direction of code division multiplexing system, multiplexing communication, communication between multiple stations, etc., can solve the problems of increasing complexity

Inactive Publication Date: 2004-04-28
INSPUR LG DIGITAL MOBILE COMMUNICATIONS CO LTD
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Problems solved by technology

[0018] However, in the above-mentioned prior art, when QPSK modulation is used in 3GPP TDD mode, the binary information mapped by the physical channel is mapped into a symbol every 2 bits, and the mapped symbol will go through the channelization process
However, for symbol mapping, a mapping table is required, and for the channelization process, complex multiplication is also required
Such a process requires a considerable scale of calculations, so there is a problem of increased complexity when composing software or hardware

Method used

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  • Symbol mapping and channelizing device of asynchronous CDMA communication system
  • Symbol mapping and channelizing device of asynchronous CDMA communication system
  • Symbol mapping and channelizing device of asynchronous CDMA communication system

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Embodiment Construction

[0026] Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0027] image 3 It is a structural block diagram of the symbol mapping and channelization device of the asynchronous code division multiple access system of the present invention. As shown in the figure, it has the following structure: weighted sign binary converter (20) outputs 0 corresponding to weighted sign, 1 binary number and 0, 1 binary number corresponding to weighted imaginary number; Binary sign converter (10) pairs continuous The two bit streams are subjected to "exclusive OR" logical operation, and are divided into real part and imaginary part by logical negation, and then according to the virtual binary number corresponding to the output from the above-mentioned weighted sign binary converter, the above-mentioned real part and imaginary part Part is exchanged and output; Binary OVSF code generator (40) maps the OVSF code generated according...

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Abstract

A symbol image and channelization device for an asynchronous CDMA communication system includes a weighted symbol binary converter, a binary symbol converter, a binary OVSF code generator, a binary channelization converter and an imager. When operating in symbol image and channelizaiotn at 3g TDD mode, the device does not use storage list or multiple operation to process with binary operation having the efficiency of shortening operation time and reducing complexity of the system.

Description

technical field [0001] The invention relates to a symbol mapping and channelization device of an asynchronous code division multiple access communication system, especially when QPSK modulation is performed in 3GPP TDD mode, the symbol mapping and channelization process is converted by binary operation instead of multiplication, In software and hardware practice, processing time and complexity can be reduced. Background technique [0002] Generally speaking, a code division multiple access communication system performs reception and transmission of multiple user signals through the same channel. In particular, a communication system using Code Division Multiple Access (CDMA) can use the same channel to transmit multiple users at the same time because it distinguishes each user signal from each other based on an orthogonalized code. Signal. [0003] For this reason, in the transmitter of the code division multiple access communication system, each data bit of each user sign...

Claims

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Application Information

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IPC IPC(8): H04J13/20H04B1/76H04B7/26
CPCH04B1/40H04J13/20
Inventor 张锡一
Owner INSPUR LG DIGITAL MOBILE COMMUNICATIONS CO LTD
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