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Method for expanding band width of broadband radio communication system based on OFDM technique

A broadband wireless communication and wireless communication system technology, which is applied in the field of bandwidth expansion of broadband wireless communication systems, can solve the problems that spectrum resources cannot be used in a timely, effective and sufficient manner, and achieve the effect of protecting network investment

Inactive Publication Date: 2012-11-28
如皋市华灿置业有限公司
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  • Application Information

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Problems solved by technology

Since the design bandwidth of IMT Advanced (4G) is fixed bandwidth series such as 5, 10MHz, 20MHz and 40MHz, the frequency bandwidth composed of the small bandwidth gradually released by TD-SCDMA and the original large bandwidth of IMT Advanced (4G) is not the frequency bandwidth of IMT Advanced (4G). (4G) design bandwidth series, so that spectrum resources cannot be utilized in a timely, effective and full manner

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  • Method for expanding band width of broadband radio communication system based on OFDM technique
  • Method for expanding band width of broadband radio communication system based on OFDM technique
  • Method for expanding band width of broadband radio communication system based on OFDM technique

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Embodiment Construction

[0034] Frequency Division Multiplexing Orthogonal Frequency Division Multiplexing, referred to as OFDM technology, is a high-speed transmission technology in a wireless environment. Most of the frequency response curves of wireless channels are non-flat, and the main idea of ​​OFDM technology is to divide a given channel into many orthogonal sub-channels in the frequency domain, use a sub-carrier for modulation on each sub-channel, and transmit each sub-carrier in parallel . In this way, although the overall channel is non-flat and has frequency selectivity, each sub-channel is relatively flat, and narrowband transmission is performed on each sub-channel, and the signal bandwidth is smaller than the corresponding bandwidth of the channel, so the signal waveform can be greatly eliminated. Interference between. Since the carriers of each sub-channel in the OFDM system are orthogonal to each other, their spectrums overlap with each other, which not only reduces the mutual interf...

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Abstract

The invention relates to a bandwidth expanding method of a broadband wireless communication system based on the OFDM technology, comprising: after adjacent other wireless system releases a bandwidth, a spectral bandwidth of the broadband wireless communication system is expanded; a corresponding IFFT point is calculated according to the expanded spectral bandwidth, and the expanded IFFT point N of the broadband wireless communication system, namely a sub-carrier number comprised by the broadband wireless communication system is determined; in N sub-carriers, data is only modulated on the whole or a portion of sub-carriers in sub-carriers corresponding with the expanded bandwidth. The invention can fully and effectively make use of a scattered bandwidth near an evolvement system bandwidth.

Description

technical field [0001] The present invention relates to orthogonal frequency division multiplexing OFDM, in particular to a method for extending the bandwidth of a broadband wireless communication system based on OFDM technology. Background technique [0002] The IMT Advanced mobile communication system is the fourth-generation broadband wireless mobile communication technology. At present, the International Telecommunication Union ITU has begun to study and formulate the fourth-generation mobile system 4G standard. The goal of 4G is to make the mobile user data transmission rate reach 100Mbit / s and the static user data transmission rate reach 1Gbit / s before 2010. For this purpose, the bandwidth of 4G can be as high as 100MHz. Since the mobile communication system evolves smoothly, in order to protect the interests of operators, within a certain period of time, the fourth generation communication system and the third generation mobile communication system, including TD-SCDM...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26H04L5/02
Inventor 孙长印
Owner 如皋市华灿置业有限公司