Method and apparatus for generating zero correlation section code, transmitting and receiving spread-spectrum code

Abstract

The present invention discloses a method for generating a zero correlation zone code. The method comprises the following procedures: combining a linear feedback shift register sequence (m sequence) with initial maximum length with sequence (1) to basic code; and expanding the basic code to generate the zero correlation zone code. The invention additionally discloses a method for generating and transmitting the spectrum spreading code with the zero correlation zone code. The method comprises the following procedures: expanding the basic code generated with the initial m sequence and sequence (1) for generating the zero correlation zone code; and inserting a nonzero protecting interval in the zero correlation zone code, generating and transmitting the spectrum spreading code. The invention also discloses a method for generating and receiving the spectrum spreading code with the zero correlation zone code. The invention further respectively discloses a device for generating the zero correlation zone code, a device for transmitting the spectrum spreading code and a device for receiving the spectrum spreading code. The method of the invention can increase the number of the available code of the generated zero correlation zone code thereby increasing the number of the available code of the transmitting spectrum spreading code and receiving spectrum spreading code generated with the zero correlation zone code.

Description

technical field [0001] The invention relates to the field of communication coding, in particular to a method and a device for generating a zero-correlation area code, a method and a device for generating a sending spreading code, and a method and a device for generating a receiving spreading code. Background technique [0002] Codes used in communication systems usually need to meet certain performance requirements in order to realize their specific functions. For example, in a communication system using direct sequence spread spectrum technology, code sequences are used to spread and despread user signals, and different code sequences are used to identify different users. To support multiple users sharing the same frequency band and time slot, the number of spreading codes used to identify users should be as large as possible. The spreading code should have certain characteristics in order to realize the orthogonal division of signals of different users under multipath pro...

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Problems solved by technology

Therefore, the length of the zero-correlation zone of the existing bi-phase ZCZ code is always an integer power of 2, and the length of the zero-correlation zone that is greater than the maximum time delay of the system will be selected, resulting in too much richness in the anti-interference ability, while the code's The number is too small, that is, the number of actually available ZCZ codes is limited

[0008] Moreover, in the communication system using direct sequence spread spectrum technology, when the spread spectrum gain is given, the code length of the spread spectrum address code is determined, because the existing zero-correlation zone length can only be limited to be greater than the actual system The integer power of 2 of the maximum time delay, therefore, using the spread spectrum address code with zero correlation zone generated by the existing two-phase ZCZ code, the number of available codes is relatively limited, that is, in the direct sequence spread spectrum communication system, The number of users that can support no multipath interference and no multiple access interference is relatively limited

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