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MC-CDMA system transmitting and receiving method

A technology of MC-CDMA and receiving method, which is applied in the field of multi-carrier technology and code division multiple access in mobile communication system, can solve the problems of unfavorable high-speed wireless transmission of data, difficulty in realization, increase of system frequency resource overhead, etc.

Inactive Publication Date: 2006-05-24
BEIJING JIAOTONG UNIV
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Problems solved by technology

However, adding the serial-to-parallel conversion link will increase the number of subcarriers in the system by P times, which will greatly increase the frequency resource overhead of the system. At the same time, because the number of subcarriers has increased by P times, it will also greatly increase the complexity and processing of the transceiver itself. The complexity, and in practice, because the channel is dynamically changing, it is necessary to dynamically adjust P to adapt to the change of the channel, which is very difficult to implement and is not conducive to high-speed wireless transmission of data

Method used

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  • MC-CDMA system transmitting and receiving method
  • MC-CDMA system transmitting and receiving method
  • MC-CDMA system transmitting and receiving method

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Embodiment Construction

[0049] The method of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0050] refer to figure 1 The transmitting process of any user k of a kind of MC-CDMA system, concrete steps include:

[0051] (1) The binary signal produced by the source 11 of any user k undergoes BPSK modulation 12, and the data stream produced passes through 1:P duplication 13 to form P-way identical parallel data streams, a k ( t ) = Σ n = - ∞ ∞ a k ( n ) g T s ( t - nT s ) Indicates user k...

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Abstract

The transmitting procedure includes steps: reproducing data stream modulated through BPSK from user so as to form parallel data stream identical in P routes; carrying out spread spectrum in frequency domain for reproduced parallel data stream in P routes, taking symbol period of transmission as integral multiple of í«Qiepuí» period; inverse FFT is carried out for parallel signal in P routes after spread spectrum; transmitting added modulated sub carrier signals in P routes. The receiving procedure includes steps: FFT is carried out for signal received from antenna to recover signals of each sub carrier; carrying out de-spread and matched filtering processes for signals in each path, each sub carrier and each user so as to obtain de-spread signal; uniting multipath signal in time domain so as to obtain signal of united each sub carrier in multipath; after combination in frequency domain obtains final judging variable; BPSK modulating the judging variable to recover userí»s data stream.

Description

technical field [0001] The invention belongs to the technical fields of multi-carrier (MC) technology and code division multiple access (CDMA) adopted by mobile communication system. Background technique [0002] In 3G, CDMA is the most important technology, and multi-carrier modulation will be the key technology of future broadband wireless transmission system. Combining multi-carrier technology with CDMA technology to form a multi-carrier CDMA system is one of the important directions for future mobile communication development. The combination of multi-carrier technology and CDMA technology mainly includes three main forms: multi-carrier CDMA (MC-CDMA), multi-carrier direct-sequence spread spectrum CDMA (MC-DS-CDMA) and multi-tone modulation CDMA (MT-CDMA). R. Prasad, S. HARA. An Overview of Multi-carrier CDMA. IEEE Commun. Magazine, 1997, 35(12): 126-133]. The MC-CDMA scheme adopts frequency domain spread spectrum technology, and the MC-DS-CDMA and MT-CDMA schemes adop...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L5/02
Inventor 杨维李航颜永庆尤肖虎
Owner BEIJING JIAOTONG UNIV
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