Pseudo code capturing method and capturing device using multiple antennae of direct sequence spread spectrum system

A technology of direct sequence spread spectrum and capture device, which is applied in the field of multi-antenna pseudo-code capture, and can solve problems such as slow weight convergence, theoretical analysis, and difficult capture performance

Inactive Publication Date: 2010-05-05
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] Another type of method is to perform beamforming on signals received by multiple antennas during acquisition to suppress interference and improve SINR, such as the literature B.Wang and H.M.Kwon, PN code acquisition using smart antenna for spread-spectrum wireless communications-I[ J], IEEE Trans on Vehicular Technology, 2003, 52(1): 142-149 (B.Wang and H.M.Kwon, Pseudorandom Code Acquisition Using Smart Antennas for Spread Spectrum Wireless Communications, IEEE Transactions on Mobile Technology, 2003, 52(1): 142-149), the normalized least mean square algorithm (NLMS) is used to obtain the weight vector of spatial weighting, and the weight convergence is relativ

Method used

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  • Pseudo code capturing method and capturing device using multiple antennae of direct sequence spread spectrum system
  • Pseudo code capturing method and capturing device using multiple antennae of direct sequence spread spectrum system
  • Pseudo code capturing method and capturing device using multiple antennae of direct sequence spread spectrum system

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Embodiment 1

[0082] Embodiment 1: as figure 2 As shown, carrier Doppler search is not considered in this embodiment, and this situation is applicable to applications where the frequency deviation of carrier transceiving frequency is relatively small. The receiving end of the system uses M antennas, and the direct sequence spread spectrum signal received by each antenna first passes through the radio frequency unit, undergoes low-noise amplification, filtering, and frequency conversion to an intermediate frequency signal, and then sends it to figure 2 in the capture device.

[0083] The signal sent to the capture device is first sent to the analog-to-digital conversion unit 100 . The analog-to-digital conversion unit is composed of M analog-to-digital converters (ADC) 101, and sampling and quantization are performed in the analog-to-digital conversion unit for subsequent digital processing.

[0084] In the digital down-conversion unit 110, the sampled and quantized received signal is mu...

Embodiment 2

[0109] Embodiment 2: as image 3 As shown, in this embodiment, the carrier Doppler parallel search is used, which is suitable for applications where the frequency deviation of the carrier transceiver is relatively large. The receiving end of the system uses M antennas, and the direct sequence spread spectrum signal received by each antenna first passes through the radio frequency unit, undergoes low-noise amplification, filtering, and frequency conversion to an intermediate frequency signal, and then sends it to figure 2 in the capture device.

[0110] The signal sent to the capture device first passes through the analog-to-digital conversion unit 100 for sampling and quantization for subsequent digital processing. The sampled and quantized digital signals are respectively sent to the P group of capturing branches 200 . Each group of capture branches 200 includes a digital down-conversion unit 110 , a correlator unit 120 , and a capture decision statistic calculation unit 1...

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Abstract

The invention provides a pseudo code capturing method and device using multiple antennae of a direct sequence spread spectrum system. The method comprises the following steps: (1) each antenna uses one capture branch to determine self-adaptive weight vector by combining capture branch output according to the space correlation matrix of the received signal acquired by each antennae; (2) the capture branch output is subjected to weighted sum by using the self-adaptive weight vector in the step (1) so as to output decision statistics; and (3) the captured decision statistics is compared with a threshold to make a decision, if the captured decision statistics is more than or equal to the threshold, a tracking phase is carried out; otherwise, the PN code phase position of a local PN code relatively to the received signal is converted and the above processes are repeatedly carried out. The device comprises an analog digital conversion unit, digital down-conversion unit, a correlator unit, a captured decision statistic calculation unit and a threshold comparison unit. The device has the advantages of simple structure, strong interference resistance, independent decision threshold to signal-to-interference and noise ratio and the like.

Description

technical field [0001] The invention mainly relates to the technical field of direct sequence spread spectrum, in particular to a pseudo code acquisition method and equipment using multiple antennas in a direct sequence spread spectrum system. Background technique [0002] The direct sequence spread spectrum system has good anti-interference and anti-interception performance, and can also be used to realize code division multiple access, ranging and timing, so it has been widely used in communication, positioning and navigation, measurement and control systems, etc. [0003] In a direct-sequence spread spectrum system, if the receiver wants to correctly demodulate the received signal, it must first synchronize the pseudo-random sequence (also called PN code, pseudo-code) in the receiver with the PN sequence of the received signal. This synchronization process is implemented in two steps, namely capturing and tracking. Through the acquisition stage, the timing error between ...

Claims

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Application Information

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IPC IPC(8): H04B1/707H04B7/08H04B1/7075H04B1/712
Inventor 张颖光魏急波习勇
Owner NAT UNIV OF DEFENSE TECH
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