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Prefix detector for WCDMA

A wideband code division multiple access and detector technology, which is applied in the direction of code division multiplexing system, communication between multiple stations, multiplexing communication, etc., can solve the waste of calculation and increase the false alarm rate of reception and other issues to achieve the effect of reducing false alarm rate, reducing negative impact, and reducing useless calculations

Inactive Publication Date: 2007-06-27
ALCATEL LUCENT SHANGHAI BELL CO LTD
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AI Technical Summary

Problems solved by technology

Traditional detectors waste a lot of computation and also increase the false alarm rate of reception

Method used

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  • Prefix detector for WCDMA
  • Prefix detector for WCDMA

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Embodiment Construction

[0026] Please refer to shown in Fig. 2, wideband code division multiple access prefix detector of the present invention comprises successively connected detwiddle factor unit 1, scrambling code generator 2, sliding window correlator 3, accumulator 4, Hadamard code conversion unit 5 , decider 6,

[0027] In FIG. 2 , the received signal first passes through the twiddle factor removal unit 1 to remove the phase twiddle factor, so that the received symbol signals have the same phase in the correlation range.

[0028] Among them, the detwiddle factor unit 1 carries out conjugate complex multiplication of the input signal and the twiddle factor exp(j*(PI / 4+n*PI / 2)), (n=0, 1, 2, ...), and removes The influence of the phase change in the transmitted signal; exp(j*(PI / 4+n*PI / 2)), (n=0, 1, 2, ...) performs conjugate multiplication to remove the transmitted signal The effect of phase changes.

[0029] Conjugate complex multiplication cannot completely eliminate the influence of the pha...

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PUM

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Abstract

The invention discloses a broad band code division multiple access (CDMA) prefix detector characterized by that, a timing device is added to the detector, the timing device calculates the time from the starting time of the down channel sending frame according to the time relationship between the user end up and down channel and the size of the subzone and sends control signal to the sliding window correlator. Further, the sliding window correlator performs sliding window correlating to intervening code and the signal of the phase removed rotation factor according to the control information of the clock. In the time when there may be prefix arriving, the sliding window register shifts and correlates the input signal and the intervening code, in the time apart from the said period, there is no signal output. Therefore the detector reduces substantially the unnecessary operations, the negative influence caused by the operating result is also diminished, the false alarm rate is lowered.

Description

technical field [0001] The present invention relates to digital wireless communication, and specifically refers to a wideband code division multiple access prefix detector, which can identify effective signals in public wireless channels, that is, access identification of wideband code division multiple access uplink public wireless channels. Background technique [0002] In wideband code division multiple access, the uplink random access channel and common packet channel both send prefixes to the UTRAN side first, and then decide further actions according to the response information given by the UTRAN side. The present invention is a prefix receiving device. [0003] The generation of the prefix part of the uplink access channel is shown in the following formula: [0004] pre(n)=Scrm(n)*Sig(n)*exp(j*(PI / 4+n*PI / 2)), n=0, . . . , 4095. [0005] The signature sequence Sig(n) is composed of a Hadamard code sequence with a length of 16 repeated 256 times. [0006] For the tra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04J13/00H04Q7/20H04B7/26
Inventor 于泽洋蔡立羽曹鹏志
Owner ALCATEL LUCENT SHANGHAI BELL CO LTD
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