Method for constructing cognitive radio simulation system on basis of complementary bridge function sequence

A bridge function sequence, cognitive radio technology, applied in the field of cognitive radio, can solve the problem that the authorized spectrum is not fully utilized, and achieve the effect of enhancing the ability to resist multiple access interference and resisting multipath interference.

Inactive Publication Date: 2012-06-27
BEIHANG UNIV
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Problems solved by technology

Recent tests show licensed spectrum is underutilized

Method used

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  • Method for constructing cognitive radio simulation system on basis of complementary bridge function sequence
  • Method for constructing cognitive radio simulation system on basis of complementary bridge function sequence
  • Method for constructing cognitive radio simulation system on basis of complementary bridge function sequence

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Embodiment Construction

[0033] see Image 6 , The present invention is a method for constructing a cognitive radio simulation system based on complementary bridge function sequence. The specific steps of the method are as follows:

[0034] Step 1: Use the Walsh sequence with sequence values ​​of "+1", "-1" and the bridge function sequence with sequence values ​​of "+1", "0", "-1" as spreading sequences and input them to all In the constructed simulation system, the zero autocorrelation zone of the bridge function is increased by changing the shift parameter j of the bridge function sequence. From the final simulation result of the system, that is, the bit error rate curve, it can be seen that the zero correlation zone is The bridge function sequence has better bit error rate performance than the Walsh sequence, that is, it has better ability to resist multipath interference;

[0035] Step 2: Input the m sequence and the bridge function sequence as the spread spectrum sequence into the constructed simulati...

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Abstract

Provided is a method for constructing a cognitive radio simulation system on the basis of a complementary bridge function sequence. The method comprises step 1 inputting a spectrum spreading sequence into a constructed simulation system with a walsh sequence with sequence values of '+1' and '-1' and a bridge function sequence with sequence values of '+1', '0' and '-1' serving as the spectrum spreading sequence; step 2 respectively inputting an m sequence and a bridge function sequence which serve as a spectrum spreading sequence into the constructed simulation system; step 3 considering capacity for suppressing multi-access interference of a multi-user system when the bridge function sequence with a zero correlation of a cross-correlation function is utilized to serve as the spectrum spreading sequence under the multi-user system, wherein the step 1 and the step 2 consider the capacity for suppressing multi-path interference of a single-user system. The method constructs the cognitive radio simulation system on the basis of the complementary bridge function sequence and utilizes the Underlay accessing technology. By utilizing the bridge function sequence to serve as the spectrum spreading sequence, a ternary sequence with a zero correlation zone is verified to have better multi-path interference resistance capacity than a binary sequence.

Description

Technical field: [0001] The invention relates to a method for constructing a cognitive radio simulation system based on complementary bridge function sequences. The system uses Gaussian pulses as transmit pulses and Walsh sequence and bridge function sequence as spreading sequences. It can be judged by the calculation of bit error rate that the three-value bridge function sequence with zero correlation zone is better than Walsh sequence. The sequence has better bit error rate performance. The invention belongs to the field of cognitive radio technology. Background technique: [0002] In the past two decades, with the development of society, people's demand for wireless communication has increased rapidly, and wireless networks have grown rapidly. As many major wireless spectrums have been allocated to specific applications, the scarcity of spectrum has become more and more serious. Therefore, how to meet people's increasing demand for wireless communications under limited spec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B17/00H04B1/711H04B1/7097H04B17/391
Inventor 洪晟陶文辉周正杨洪旗
Owner BEIHANG UNIV
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