Descrambling and despreading method and apparatus

Descrambling and despreading method and apparatus

  • CN 101,064,581 B
  • Filed: 04/27/2006
  • Issued: 07/04/2012
  • Est. Priority Date: 04/27/2006
  • Status: Active Grant
First Claim
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1. a descrambling and de-spreading method is characterized in that, being used for spreading factor is 2 nDescrambling and de-spreading, comprising:

  • (a) digital baseband data that receives is carried out buffer memory, the input metadata cache is to adopt two groups of shift register group, on each clock edge, the input of said digital baseband data from said two groups of shift register group is moved into;

    (b) utilize the conjugation scrambler that institute'"'"'s data in buffer is carried out descrambling, according to the scrambler of DSP configuration, real part, the imaginary part scrambler factor of the conjugation that is used for when directly producing descrambling multiplying each other with real part, imaginary part multiply by said real part, the imaginary part scrambler factor with said data;

    (c) data behind the descrambling being carried out despreading, is the data of symbol level through the numeric data code conversion with the data conversion of chip-level, adopts quick butterfly computation, and adder-subtractor is weaved into two groups, and despreading control is the plus-minus attribute of the said two groups of adder-subtractor groups of control;

    (d) position and/or the spreading factor decomposition according to multipath obtains corresponding data;

    Different spreading factors, the extraction position of data is different, and all phase places of each multipath have all been carried out descrambling and de-spreading;

    According to the position of effective multipath, from the result of despreading, extract corresponding data.

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