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Multiple access signal transmission method for broadband wireless communication system

A broadband wireless communication and access signal technology, applied in the field of digital information transmission, can solve the problem of inconvenient time synchronization at the receiving end, and achieve the effects of achieving multi-user diversity gain, solving the problem of multiple access, and accurate channel estimation

Inactive Publication Date: 2011-02-16
TSINGHUA UNIV
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  • Claims
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Problems solved by technology

However, this technology is not convenient for fast time synchronization at the receiving end

Method used

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  • Multiple access signal transmission method for broadband wireless communication system
  • Multiple access signal transmission method for broadband wireless communication system
  • Multiple access signal transmission method for broadband wireless communication system

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Embodiment Construction

[0027] The OFDMA signal transmission method proposed by the present invention for the downlink time-frequency domain of the broadband wireless communication system is described as follows in conjunction with the accompanying drawings and embodiments:

[0028] The method flow of the present invention (the work of sending end) is as figure 1 shown, including the following steps:

[0029] (1) Channel coding and digital modulation are respectively performed on the transmission block data of each user to obtain digitally modulated information. The channel coding method may be convolutional code, low-density parity-check code, Reed-Solomon code and so on. Carry out digital modulation on the information after channel coding, and its modulation method can be binary phase shift keying, multi-ary system phase-shift keying, multi-ary system quadrature amplitude modulation, etc.;

[0030] (2) Mapping the above-mentioned modulated user information and pilots to corresponding data subcarr...

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Abstract

The invention relates to a multiple access signal transmission method for a broadband wireless communication system, belonging to the technical field of digital information transmission. The method comprises the following steps of: respectively carrying out channel coding and digital modulation on transmission block data of a user on each path to obtain digitally modulated information; mapping the information and the pilot frequency of the user to corresponding data subcarrier and pilot frequency subcarrier, dividing all the data subcarriers into a plurality of subchannels to ensure that the information of each user corresponds to one or more than one subchannel, and setting protection subcarriers and DC subcarriers to be 0; carrying out inverse discrete Fourier transform on all the subcarriers to obtain time domain signals; and combining a generated protection interval sequence and the time domain signals, converting into a serial data stream, and sending the serial data stream. The invention has the advantages of high synchronization speed, accurate channel estimation and the like; more users can be supported by using smaller access time delay, wireless resources can be distributed freely, depth fading and narrow-band interference can be effectively resisted, and multiple-user diversity gain can be realized conveniently.

Description

technical field [0001] The invention belongs to the technical field of digital information transmission, in particular to the multiple access technology in the broadband wireless communication system. Background technique [0002] Signal transmission in broadband wireless communication needs to overcome the problems of frequency selective fading and time selective fading caused by channel multipath effect and Doppler effect. The proposal of Orthogonal Frequency Division Multiplexing (hereinafter referred to as OFDM) provides a practical means to solve this problem. An improved version of OFDM is disclosed in Chinese patent [CN200810227375.6]—— The Orthogonal Frequency Division Multiplexing (Time domain and Frequency domain United Orthogonal Frequency Division Multiplexing, hereinafter referred to as TFU-OFDM) not only retains the advantages of traditional OFDM technology for channel estimation, but also has the advantages of accurate and fast acquisition Advantages of synch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04L25/03
Inventor 曾捷粟欣徐翼黎靖宇王海军赵玉瑶薛光达胡莉丽
Owner TSINGHUA UNIV
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