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Method for encoding and decoding applicable to multi-user multicast communication and device thereof

An encoding and decoding method and multi-user technology, which are applied in wireless communication, error prevention/detection using return channel, code conversion, etc., can solve problems such as constraints, improve utilization, save channel resources, and achieve simple effects

Inactive Publication Date: 2009-09-16
西安新邮通信设备有限公司
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Problems solved by technology

[0003] In order to improve the security and reliability of the system, the existing technology generally adopts methods such as increasing the strength of the error correction code and the length of the key in the encryption algorithm, choosing a higher modulation order and more antennas, etc., through hardware complexity and the complexity of the algorithm to improve the system, but such a method is restricted by the current level of hardware development and the progress of related technical research

Method used

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  • Method for encoding and decoding applicable to multi-user multicast communication and device thereof
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  • Method for encoding and decoding applicable to multi-user multicast communication and device thereof

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Embodiment Construction

[0024] First, the users who need to communicate with each other in the same cell are divided into a group and numbered randomly, then the information sent by user i is . Thus determine the shift register length m=m max , m max for m 1 m 2 Λm n medium maximum. Then store the information sequences of n users into n m-long shift registers respectively, when m i , take the first bit in shift register 2 and the first bit in shift register 3 and perform modulo 2 operation to get , and so on, perform modulo 2 sum operation on the jth bit of shift register i and the jth bit of shift register i+1 to get , and finally perform modulo 2 operations on the mth bit of shift register n-1 and the mth bit of shift register n to obtain , to achieve encoding. coded information It is sent to n users in multicast mode.

[0025] The received information sequence that user i will get according to and Sort by group, enter into Figure 4 In the two recursive convolutional decode...

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Abstract

The invention discloses a method for encoding and decoding applicable to multi-user multicast communication and a device thereof. The method comprises the following steps that: an information sequence of each user in n users to be communicated with each other in a small area is saved as an information sequence with length of m bits; n information sequences with length of m are encoded to obtain output information yi<j>=Xi<j> square x(i=1)<j>, and are repeated for m times to obtain information sequences of n users y1<1>y1<2>lambada yn-1<1>lambada y(n-1)<m>; the information sequences are transmitted to the users in the group according to a multicast mode; each user decodes the received data by a recursive convolution decoding mode, the ith user decodes the received data according to a sequence of yi<j>y(n+1)<j>lambada y(n-1)<j>y1<j>lambada y(i-1)<j>, and the ith user can acquire X(i+1)<j>x(i-1)<j>, information of the jth bit of n users can be acquired in the same mode, and information of m*(n-1) of other (n-1) users can be acquired by repeating the steps. The method and the device improve the utilization rate of channel resource and the security of the system, and can be realized simply.

Description

technical field [0001] The invention relates to a codec method suitable for multi-user multicast communication, and also relates to its device. Background technique [0002] Reliability, effectiveness and security are the three main factors in the research of wireless access systems. In order to improve the reliability of transmission, error correction codes with high coding gain such as Turbo and LDPC codes are usually selected; in order to improve the effectiveness of the system, Usually, 6 X 6 or 8 X 8 multi-antenna technology and high-order modulation technology are used; in order to improve security, encryption technologies such as DES, AES, and RSA are usually used. When two or more users in the same cell communicate, it is necessary to provide each user with a different channel, which takes up a lot of resources. [0003] In order to improve the security and reliability of the system, the existing technology generally adopts methods such as increasing the strength of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M7/00H04L1/16H04B7/00H04W4/00
Inventor 郭旭东
Owner 西安新邮通信设备有限公司
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