Method for designing zero correlation zone sequence on quadrature amplitude modulation constellation

A technology of quadrature amplitude modulation and zero correlation zone, applied in the fields of satellite communication and digital communication, can solve the problems of affecting the transmission speed of user information in CDMA communication system, the small interval of anti-multiple access interference, the small interval of sequence zero correlation, etc. Achieve the effect of being conducive to high-speed data modulation, increasing system capacity, and large zero correlation interval

Inactive Publication Date: 2010-03-03
XIDIAN UNIV
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Problems solved by technology

[0009] 1. The number of sequences in the sequence cluster is too small, which directly limits the number of users in the CDMA communication system
[0010] 2. Too little bit information can be transmitted in each sequence cycle, which directly affects the information transmission speed of users in the CDMA communication system
[0011] 3. The zero-correlation interval of the sequence is too small, that is, the interval against multiple access interference is too small

Method used

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  • Method for designing zero correlation zone sequence on quadrature amplitude modulation constellation
  • Method for designing zero correlation zone sequence on quadrature amplitude modulation constellation
  • Method for designing zero correlation zone sequence on quadrature amplitude modulation constellation

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Embodiment Construction

[0033] refer to figure 2 , the present invention constructs the steps of the zero-correlation zone sequence on the quadrature amplitude modulation constellation as follows:

[0034] Step 1, select a 4×4 order 4-phase complex Hadamard matrix.

[0035] The selected 4 * 4 order 4-phase complex Hadamard matrix in the present invention is:

[0036] H ′ ( 0 ) = 1 1 1 1 1 j - j 1 1 - j j ...

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Abstract

The invention discloses a method for designing a zero correlation zone sequence on a quadrature amplitude modulation constellation, belonging to the technical field of digital communication and mainly solving the problems that the prior zero correlation sequence family has few sequences, the transmission bits during each sequence period is very little and the zero correlation interval of the sequence is very small. The method comprises the following steps: constructing a 4-phasezero correlation zone sequence family by adopting a recursive mode through utilizing 4*4 order 4-phase compound Hadamard matrix; dividing the 4-zero-phase zero correlation zone sequence family into disjoint sequence sets, wherein each sequence set includes equal sequences; and constructing the zero correlation zonesequence family on the quadrature amplitude modulation constellation according to the disjoint sequence sets. With the method, the constructed sequence family has the advantages of large number of sequences, large transmission bits during each sequence period and large zero correlation interval; and the method can be applied to the fields of medium and large capacity digital microwave communication, wire television network high speed data transmission and satellite communication.

Description

technical field [0001] The scheme belongs to the technical field of digital communication, and involves the construction of zero-correlation sequence clusters on the quadrature amplitude modulation constellation, and can be applied to medium and large-capacity digital microwave communication, high-speed data transmission of cable TV network, satellite communication and other fields. Background technique [0002] Code Division Multiple Access (CDMA) is a main technology of the third generation mobile communication system. This technology assigns a unique address code to different users, which is a communication method that allows different users to work simultaneously on the same frequency spectrum at the same time. Code division multiple access overcomes the shortcomings of time division multiple access and frequency division multiple access, and the number of users accommodated is greatly increased. CDMA technology began to be used in military communications in the 1940s, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/707H04L27/34
Inventor 马文平张晓孙绍辉
Owner XIDIAN UNIV
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