Emitting and receiving method of up-link system in space-time block code MC-CDMA

An MC-CDMA, space-time block code technology, applied in the field of code division multiple access and multi-carrier technology, can solve the problems of occupying frequency resources, disadvantage of high-speed wireless data transmission, and difficulty in implementation.

Inactive Publication Date: 2006-06-28
BEIJING JIAOTONG UNIV
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Problems solved by technology

Since the STBC-MC-CDMA scheme is constructed based on the traditional MC-CDMA scheme, each subcarrier is required to experience a frequency non-selective fading channel. To ensure this condition, the chip period of the spreading sequence and the symbol period of the transmission must be Subject to certain restrictions, obviously this is not conducive to the realization of high-speed wireless data transmission
In this STBC-MC-CDMA scheme, in order to ensure that each subcarrier experiences frequency non-selective fading, the space-time coded symbols must go through a 1:Q serial-to-parallel (S/P) conversion link,

Method used

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  • Emitting and receiving method of up-link system in space-time block code MC-CDMA
  • Emitting and receiving method of up-link system in space-time block code MC-CDMA
  • Emitting and receiving method of up-link system in space-time block code MC-CDMA

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Embodiment Construction

[0060] The method of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0061] refer to figure 1 The transmission process of any user k in the uplink of the space-time block code MC-CDMA system, the specific steps include:

[0062] (1) The binary signal generated by the source 10 of any user k undergoes BPSK modulation 11 to generate two consecutive information bits b of the data stream k (2n) and b k (2n+1) Space-time block coding is carried out through 2×2 orthogonal space-time block coding12, and the mapping matrix of space-time block coding is:

[0063] a k , 1 ( 2 n + 1 ) ...

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Abstract

This invention relates to an emitting and receiving method for up-link in the MC-CDMA system including the following steps: emission: data flows of each user are divided into two paths by 2x2 orthogonal empty packet coding, the data flows of each are duplicated to form P paths of parallel data flows to be spread with frequency domain, the emitted symbol period is the integer multiple of the chip period, carrying out quick Fourier transformation to be added and emitted, receiving: carrying quick Fourier transformation to signals received by antennas, de-spreading, matching and filtering signals of each sub-carrier of each user then to carry out empty time decode and time domain merging then frequency domain merging to the merged signals and then space domain merging to get the decisive variable of the user signals and then demodulating BPSK to resume data signals of the user.

Description

technical field [0001] The invention belongs to mobile communication multiple-input multiple-output (MIMO) space-time block code technology, multi-carrier (MC) technology and code division multiple access (CDMA) [0002] technology field. Background technique [0003] 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 has three main forms: multi-carrier CDMA (MC-CDMA), multi-carrier direct-sequence spread spectrum CDMA (multicarrier 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]. Among them, the MC-CDMA scheme is considered to be the most...

Claims

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Application Information

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IPC IPC(8): H04B7/04H04L5/02H04L27/20H04L27/22
Inventor 杨维李航尤肖虎
Owner BEIJING JIAOTONG UNIV
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