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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 systems, can solve the problems of unfavorable high-speed wireless transmission of data, increasing the complexity of transceivers, and difficulty in implementation.

Inactive Publication Date: 2009-09-02
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
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  • MC-CDMA system transmitting and receiving method

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Embodiment Construction

[0050] The method of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0051] refer to figure 1 The transmitting process of any user k of a kind of MC-CDMA system, concrete steps include:

[0052] (1) The binary signal produced by the information source 11 of any user k undergoes BPSK modulation 12, and the data stream generated 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 - n T s ) ...

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Abstract

A MC-CDMA system transmitting and receiving method comprises the following steps: a transmitting step, duplicating the data streams modulated by BPSK to form P parallel data streams; carrying out frequency domain expansion to the duplicated P parallel data streams frequency, the symbol period of the launch is taken as an integer multiple of the chip cycle; the P-channel parallel signal after frequency-domain spread spectrum is carried out fast Fourier inverse transform; the modulated P-channel sub-carrier signals are added and then transmitted; the receiving step, Perform fast Fourier transform on the signal received by the antenna to recover the signal of each subcarrier; perform despreading and matched filter processing on the signal of each subcarrier and each path of each user to obtain the despread signal; Combine multipath signals in time domain to obtain multipath combined signals for each subcarrier; combine multipath signals in frequency domain to obtain final decision variables of user signals; perform BPSK demodulation on final decision variables , to restore the user's data flow.

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 Patents(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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