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Multi-address encode method for packet time, space and frequency

A block coding and multi-address code technology, which is applied in the direction of code division multiplexing system, multiplexing code distribution, multiplexing communication, etc., can solve problems such as limited effect and unsatisfactory inter-correlation characteristics of address codes, and achieve The effect of solving complexity

Inactive Publication Date: 2012-08-22
北京清深技术开发中心有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0024] The fatal shortcoming of the traditional code division multiple access system is the "near and far effect", which is caused by the unsatisfactory cross-correlation characteristics of the address codes
Because the main peak of a long-distance weak signal is submerged by a short-distance strong signal, and it is well known that only the main peak is a useful signal. In order to overcome the fatal influence of the "far effect", the traditional CDMA system adopts strict and fast The power control technology of each address user tries to make the strength of the signal of each address user reach the receiver roughly equal under any circumstances, but practice has proved that the effect of this method is very limited; the best method in theory is to ensure that the address codes are mutually Correlation function has no peak under working environment conditions, which is exactly the method adopted by LAS-CDMA system, both theory and practice have proved that this method is indeed the best

Method used

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  • Multi-address encode method for packet time, space and frequency
  • Multi-address encode method for packet time, space and frequency
  • Multi-address encode method for packet time, space and frequency

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Experimental program
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specific Embodiment approach

[0115] The basic coding steps of the present invention are as follows:

[0116] step one:

[0117] Selection of Basic perfect complementary orthogonal code pairs mate.

[0118] This step can be subdivided as follows:

[0119] 1) Determine the length N of the basic perfect orthogonal complementary code pair according to the required width of the "zero correlation window" and the number of codes in the code group.

[0120] 2) According to the relationship

[0121] N=N 0 ×2 l ; l = 0, 1, 2, ..

[0122] First determine the length N of a shortest basic perfect complementary code (the shortest perfect complementary code) 0 . For example, if N=12 is required, then N 0 =3, l=2.

[0123] 3) or by relation

[0124] N=N 01 ×N 02 ×2 l+1 ; l = 0, 1, 2, ...

[0125] First determine the length N of the two shortest basic perfect complementary codes 01 , N 02 . For example, if N=30 is required, then N 01 =3, N 02 =5(l=0).

[0126] 4) According to the shortest code length d...

example 1

[0134] Example 1: If Here + stands for +1; - stands for -1, possible There are many solutions, such as: +0+;-0-;+j+;+-j+;-j-;--j- and so on.

example 2

[0135] Example 2: If possible solution

[0136] etc., where a is any number not equal to +1 or -1.

[0137] Example 3: If A solution for is 1, 4, 0, 0, -1, etc.

[0138] If primary Incorrect value, then may be unsolved; sometimes despite There is a solution, but it is not convenient for engineering application. At this time, it needs to be readjusted the value of , until we have and values ​​are satisfied.

[0139] 6) If 3), because there are two shortest lengths N 01 , N 02 , then repeat 4)5) to solve two pairs and

[0140] in

[0141]

[0142] And according to the following rules, the length is 2N 01 ×N 02 The perfect complementary code pair of in

[0143]

[0144]

[0145]

[0146]

[0147]

[0148] They are both 2N in length 01 ×N 02 .

[0149] Mathematically written as:

[0150]

[0151] in the formula Represents the Kroneckzer product; · Represents a reverse sequence; Represents a non-sequence, th...

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Abstract

A grouping time, space, frequency multiaddress coding method for using the low correlation random variables or constants such as time, space and frequency etc as the coding elements, includes following steps to accomplish the coding: selecting basic perfect complementary orthogonal code pairs mate; selecting basic time, space, frequency codes expanding matrix; constructing basic perfect complementary orthogonal code pair group mate; spreading the code length and the code number in the basic perfect complementary orthogonal code pair group mate according to the spanning tree method; transforming the spanning tree. The invention make the CDMA or other communication systems using this address codes have higher frequency spectrum efficiency and larger capacity, and at the same time have stronger antifading ability, that is higher implied diversity multiplicity and higher transmission reliability, lower receiving threshold SNR, so that it need smaller transmitting power to accomplish higher reliability and higher transmission rate of the project's real requirements.

Description

technical field [0001] The invention relates to the field of code division multiple access (CDMA) wireless mobile digital communication, in particular to a multi-address packet coding method with high spectral efficiency, high anti-fading capability and high transmission reliability, in particular to a grouping time, Spatial and frequency multi-address encoding method. Background technique [0002] Improving the capacity and spectrum efficiency of the system and improving the transmission reliability of the system are the most important basic tasks in any wireless communication system, especially in the mobile digital wireless communication system. [0003] The so-called spectral efficiency refers to the maximum total signal transmission rate that the system can support per unit bandwidth in a cell or sector with a given system bandwidth, and its measurement unit is bps / Hz / cell (sector). ), the so-called transmission reliability refers to the ability of the system to resist...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04J13/16H04J13/18H04J13/00
CPCH04J13/16H04J13/18
Inventor 李道本
Owner 北京清深技术开发中心有限公司
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