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Method and equipment for realizing parallel correlator utilizing block integral in spread spectrum communication

A spread-spectrum signal and receiver technology, applied in the field of realization of parallel correlators, can solve problems such as high frequency requirements for correlation operations, difficult acquisition process, and implementation

Active Publication Date: 2008-11-26
凹凸电子(成都)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the use of a large number of parallel correlators requires a large number of logic resources and requires high frequency of correlation operations. Without optimization, the capture process is difficult to implement on an ASIC

Method used

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  • Method and equipment for realizing parallel correlator utilizing block integral in spread spectrum communication
  • Method and equipment for realizing parallel correlator utilizing block integral in spread spectrum communication
  • Method and equipment for realizing parallel correlator utilizing block integral in spread spectrum communication

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Embodiment Construction

[0018] Fig. 2 illustrates a structure diagram of an existing capture module for a specific channel. The capture module shown in Fig. 2 comprises 1023 parallel integral cores of continuous numbering from integral core 200-0 to integral core 200-1022, a channel-N C / A code generator 202 that produces C / A code, a generation carrier signal a local oscillator 204 and a search engine module 206 . Each integrating core 200 takes the IF signal, the local carrier signal, and the C / A code as input to complete the correlation operation. In the integrating core 200-0, the correlation operation includes multiplying the IF signal by the local carrier signal and the C / A code. The correlation calculation results are then sent to the search engine module 206 . The search engine module 206 judges whether the correlation operation result exceeds a predetermined threshold and judges whether a specific Doppler frequency shift and a C / A code phase shift are found. To find the starting point of th...

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Abstract

This invention provides a method and a device for applying separate integration to realize parallel correlators in frequency-spread communication, in which, a device for processing frequency-spread signals includes an IF signal pre-process unit and multiple parallel separate integrators, the IF signal pre-process unit can generate a pre-integrated result based on the input signal and local reference signals in a preset rate to divide it into multiple groups and each of which includes a pre-integrated result with preset numbers,the multiple parallel separate integrators communicate with said IF signal pre-process unit and each one can receive multiple sets of results continuously and operates the pre-integrated results of the preset numbers of the set relatively with multiple segments of offset false random noise codes so as to get multiple partial relative operation results till to receive the results of preset number of the next group.

Description

technical field [0001] This invention relates to spread spectrum digital receivers, and more particularly to the implementation of parallel correlators in Global Positioning System (GPS) receivers. Background technique [0002] Spread spectrum communication has its advantages in communication applications that require high reliability in noisy environments. According to Shannon's theorem, the need for a high signal-to-noise ratio can be reduced by widening the frequency spectrum, which shows that weak signals can be transmitted and detected using spread spectrum communication techniques. To spread the spectrum, a high-speed pseudorandom noise code (PRN) is often used to modulate a narrowband signal to generate a wideband signal. The wideband signal is modulated by the information data stream in order to convey the data. The information data rate is usually much lower than the symbol (chip) rate of the PRN code, and usually the data is edge-synchronized with the chip signal...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/69G01S1/00H04B1/709H04B1/7097
Inventor 李世杰程明强俞波
Owner 凹凸电子(成都)有限公司