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Multi-code and multi-carrier CDMA modulation/demodulation method

A technology of multi-carrier modulation and modulation method, applied in the directions of phase modulation carrier system, diversity/multi-antenna system, space transmit diversity, etc., can solve the problem of limited utilization, achieve space diversity and frequency diversity, improve user capacity, The effect of enhancing anti-interference ability

Active Publication Date: 2013-09-11
NAT ASTRONOMICAL OBSERVATORIES CHINESE ACAD OF SCI
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Problems solved by technology

[0006] In the process of realizing the present invention, the applicant realized that although the multi-carrier CDMA modulation system in the prior art has enhanced the ability to resist multipath effects and improved the utilization rate of spectrum resources to a certain extent compared with the previous simple CDMA system, this utilization The improvement of the efficiency is very limited. With the rapid development of multimedia services with increasing data volume, the field of digital communication urgently needs information transmission systems that further improve the utilization of spectrum resources, increase system user capacity, and reduce system bit error rates.

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[0024] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to specific embodiments and accompanying drawings. While illustrations of parameters containing particular values ​​may be provided herein, it should be understood that the parameters need not be exactly equal to the corresponding values, but rather may approximate the corresponding values ​​within acceptable error margins or design constraints.

[0025] In the multi-code multi-carrier CDMA modulation method and demodulation method of the present invention, the advantages of the multi-carrier CDMA system and the multi-spreading code CDMA modulation system are combined, while improving the system capacity, it has higher data transmission capability and lower error codes Rate. In addition, space-time coding itself has advantages such as the function of space diversity gain, and the present inve...

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Abstract

The invention discloses a multi-code and multi-carrier CDMA modulation / demodulation method. The multi-code and multi-carrier CDMA modulation / demodulation method combines the advantages of multi-carrier and multi-spreading-code modulation and space-time coding, improves system capacity, and has better data transmission capacity and a lower error rate, thus, the system performance is improved, the error rate is reduced, and the multi-code and multi-carrier CDMA modulation / demodulation method has wide application value in a multi-data service transmission system.

Description

technical field [0001] The invention relates to the technical field of data transmission in the wireless communication industry, in particular to a multi-code multi-carrier CDMA modulation / demodulation method. Background technique [0002] CDMA technology has been successfully applied in the second generation of mobile communication technology because of its advantages such as high system capacity, soft handover, strong anti-interference ability, low transmission power and good confidentiality. Today, with the rapid development of radio technology, people's demand for services in wireless communication systems is also further increasing, and the amount of data transmission is increasing. Under the background of this demand, spectrum resources are particularly precious. Therefore, how to improve spectrum resource utilization, increase system user capacity, and reduce bit error rate has become a hot research topic. [0003] The capacity of a spread spectrum CDMA system is sen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/04H04B7/06H04B7/08H04L27/20H04L27/22H04B1/69
Inventor 胡正群庞鹏翔施浒立裴军崔君霞
Owner NAT ASTRONOMICAL OBSERVATORIES CHINESE ACAD OF SCI
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