Descrambling and despreading method and apparatus

A technology of descrambling and despreading, applied in the field of descrambling and despreading, can solve the problems of complex control of descrambling and despreading, achieve the effect of simplifying the circuit structure and improving performance

Active Publication Date: 2007-10-31
XUANPU INDUSTRY CO LTD
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Problems solved by technology

[0021] b: The control of descrambling and despreading

Method used

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  • Descrambling and despreading method and apparatus
  • Descrambling and despreading method and apparatus
  • Descrambling and despreading method and apparatus

Examples

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Embodiment

[0102] The present invention will be further described below in conjunction with specific embodiments with reference to the accompanying drawings.

[0103] The input data cache is two sets of shift registers, as shown in Figure 2: at each clock edge, I and Q data are shifted in from I_Reg1 and Q_Reg1, and I1~I16 and Q1~Q16 are output. Since the data is two samples, So each group of registers is 32.

[0104] The role of the scrambling code conjugate generator is to directly generate the factor that is multiplied by the real part and the imaginary part during descrambling according to the scrambling code configured by the DSP. According to Expression 5, the circuit structure of the scrambling code conjugate generating unit is shown in FIG. 3 .

[0105] From Expression 5 and Figure 3, MuCi[16:1]=0110011001100110 and MuCq=1100110011001100 can be obtained. Where 0 represents 1 and 1 represents -1.

[0106] According to Expression 6, the descrambling circuit structure diagram is ...

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Abstract

The invention provides a type of de-disturbance and de-spread method and device, the method includes: (a) Digital base band data received is stored; (b) using conjugated disturbing code to de-disturbance the store the data; (c) de-spread the data which is after de-disturbance, data in code class is decomposed into characters by data code transmission; (d) Corresponding data is obtained based on position of multi-pathway and/or expanding frequency factor. The device includes: data buffer unit, conjugated disturbing code generating unit, de-disturbance unit, de-spread unit, data taking unit, the device and method in the invention fits for de-disturbance de-spread whose expanding frequency factor is 2n, and simplifies the circuit structure of receiver, increases the performance of receiver.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a method and device for descrambling and despreading in code division multiple access spread spectrum communication. Background technique [0002] Among the various systems of mobile communication, CDMA communication technology shows great development potential due to its simple frequency planning, large system capacity, strong anti-multipath ability, good communication quality, and small electromagnetic interference. Several main candidate schemes of the third generation digital cellular mobile communication system are all based on CDMA technology. [0003] There are multipath fading phenomenon in mobile communication system, which will cause serious multipath interference. In the CDMA mobile communication system using spread spectrum technology, by receiving the pilot signal with known information, the amplitude and phase information of the multipath signal can ...

Claims

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Application Information

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IPC IPC(8): H04J13/02H04B1/69H04B1/7115
Inventor 张玉玺徐会勤陈永森
Owner XUANPU INDUSTRY CO LTD
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