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An improved method of idma system based on ccsk modulation

A technology of IDMA and variance, applied in the direction of modulation carrier system, baseband system, baseband system components, etc., can solve the problem of high computational complexity, improve data transmission rate, increase effective data transmission rate, and increase computational complexity of iterative detection Effect

Active Publication Date: 2019-03-29
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
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Problems solved by technology

However, in CDMA systems, with the expansion of system capacity, the problem of multiple access interference is becoming more and more serious, and the computational complexity of traditional multi-user detection algorithms is too high to meet the actual needs

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  • An improved method of idma system based on ccsk modulation
  • An improved method of idma system based on ccsk modulation
  • An improved method of idma system based on ccsk modulation

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Embodiment Construction

[0043] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0044] At the sending end, it mainly includes three modules: forward error correction coder, spreader and interleaver. The IDMA system relies on the interleaver to distinguish different users, and uses the interleaver to scramble the sequence of low-code-rate chip sequences, thereby reducing the correlation of adjacent chips as much as possible, which can not only reduce the continuity in the communication process errors, while enabling low-complexity detection methods at the receiving end to be implemented. For the kth user, the data bit sequence is firstly subjected to FEC coding to generate the coded code sequence b k ; In order to further reduce the code rate, the coding sequence b k Perform spread spectrum to generate low code rate spread spectrum sequence c k ;Finally, the chip sequence enters the chip-level interleaver π of the kth user k ,...

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Abstract

The invention belongs to the improvement scheme of the interleaved multiple access system based on CCSK modulation, which introduces CCSK modulation and branch path iterative detection algorithm, and is especially suitable for the multiple access system that needs to increase the data rate. The purpose of the present invention is to propose an improved method based on the IDMA system that can effectively increase the transmission data rate. While having the above advantages, IDMA also has problems. As a spread spectrum communication system, the main disadvantage is the reduction of effective data transmission rate. The present invention proposes an interleaved multiple access communication system based on CCSK modulation. Under the condition of maintaining the above advantages, new data is carried through cyclic shift modulation, thereby increasing the effective data rate.

Description

technical field [0001] The invention belongs to the improvement scheme of the interleaved multiple access system based on CCSK modulation, which introduces CCSK modulation and branch path iterative detection algorithm, and is especially suitable for the multiple access system that needs to increase the data rate. Background technique [0002] As we all know, multiple access technology is the basis of wireless communication network, and it is also one of the signs of wireless communication upgrading. Both theoretical analysis and practice have proved that Code-Division Multiple Access (CDMA) has strong anti-fading ability and anti-interference ability between cells, so it has become the core technology of the third generation mobile communication system and has been widely used. application. But in the CDMA system, with the expansion of the system capacity, the problem of multiple access interference becomes more and more serious, and the computational complexity of the trad...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26H04L1/00H04L25/02H04L25/06
CPCH04L1/0045H04L1/0071H04L25/0222H04L25/061H04L27/2695
Inventor 胡苏郭惠婷黄驿轩柴胜均石荣刘志国
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA