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Non-orthogonal multi-user access and sending and combined receiving, demodulation and coding system and method

A technology for multi-user access and joint reception, which is applied in the field of non-orthogonal multi-user access and joint reception, demodulation and decoding systems for eliminating interference between users, and can solve problems such as error propagation

Active Publication Date: 2014-06-04
TSINGHUA UNIV
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Problems solved by technology

This method will cause error propagation and bring a large delay

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  • Non-orthogonal multi-user access and sending and combined receiving, demodulation and coding system and method

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[0079] The non-orthogonal multi-user access transmission and joint reception demodulation and decoding system and method proposed by the present invention, the following work flow is given to facilitate the understanding of the purpose, features and advantages of the present invention. It is mainly divided into two systems, one is multi-user non-orthogonal access and transmission, and the other is multi-user joint reception, demodulation and decoding.

[0080] (1) if figure 1 As shown, the multi-user non-orthogonal access and transmission system is equipped with a channel coding module, a coding symbol mapping module, an interleaving module and a modulation module (each user operates according to the following steps):

[0081] Channel coding module: information sequence b for the kth user k Perform channel coding, k=1,2,...,K, output sequence c after channel coding k , L is the sequence c after encoding k length;

[0082] Encoding symbol mapping module: put the sequence c...

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Abstract

The invention discloses a non-orthogonal multi-user access and sending and combined receiving, demodulation and coding system and method, and belongs to the technical field of communication. The method is characterized in that at a sending end, multiple users have access to the system in a non-orthogonal mode, and channel coding, coded symbol mapping, interleaving and modulation are carried out on a signal; at a receiving end, the received signal is multiplied by the feature sequence of each user, multi-user detection, demodulation, de-interleaving and decoding are sequentially carried out on the received signal, then multi-user detection is carried out on an output result again, and the iteration process is achieved. Based on the message passing conception, output soft information of a decoder is directly sent to undergo multi-user detection so as to achieve decoding and multi-user detection combined iteration processing. By means of the method, based on linear computation complexity, good interference elimination performance can be achieved, influence, caused by environmental noise and interference, on signal information is effectively reduced, and good BER performance and a more reliable transmission effect are achieved; meanwhile, multi-user interference elimination and decoding can be combined to be carried out, and therefore a parallel structure can be easily realized.

Description

technical field [0001] Non-orthogonal multi-user access transmission and joint reception demodulation and decoding system and method belong to the field of communication technology, in particular to non-orthogonal multi-user access and joint reception demodulation for eliminating inter-user interference in a multi-user communication system Decoding system and method. Background technique [0002] In order to reduce costs and efficiently utilize the resources of the communication system, the existing communication systems generally use non-orthogonal access methods such as Code Division Multiple Access (CDMA) and Interleaver Division Multiple Access (IDMA) to To distinguish different users, as the number of users increases, the interference between users will increase, so that the performance of the entire communication system will decrease. [0003] A class of traditional methods to eliminate multi-user interference is to treat the inter-user interference as additive noise ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/03H04L25/08H04L27/00
Inventor 匡麟玲吴胜张弛顾娜陆建华陈翔倪祖耀
Owner TSINGHUA UNIV
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