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Evolvement system being compatible with variable frequency range Wimax system, frame as well as generating method thereof

A technology for evolving systems and frequency bands, applied in the field of new systems, can solve problems such as restricting the development of Wimax, and achieve the effect of improving spectrum utilization

Inactive Publication Date: 2008-10-08
徐州铁手五金工具制造有限公司
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  • Abstract
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  • Claims
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Problems solved by technology

[0004] For the Wimax system, Wimax terminals in different frequency bands can only be connected to the system with its corresponding bandwidth. This limitation greatly restricts the development of Wimax

Method used

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  • Evolvement system being compatible with variable frequency range Wimax system, frame as well as generating method thereof
  • Evolvement system being compatible with variable frequency range Wimax system, frame as well as generating method thereof
  • Evolvement system being compatible with variable frequency range Wimax system, frame as well as generating method thereof

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Embodiment Construction

[0038] The Wimax systems of a plurality of different frequency bands described in the present invention can use various bandwidths defined by Wimax, but the Wimax of different frequency bands should use the bandwidth of the same group, that is, there is an integer multiple relationship between the two bandwidths, and the CP length should be consistent . To access the same evolution system, the bandwidth of the evolution system is greater than or equal to the sum of the compatible Wimax system bandwidth, the frequency band needs to cover the frequency band of these Wimax systems, and the frame structure also needs to continue some basic features of the Wimax system frame, and Wimax Like the system, the present invention adopts OFDM-based technology in modulation.

[0039] With reference to the frame structure shown in Figure 3, the frame length of a frame is 5ms (not limited to this), the bandwidth is 44.8MHz, including a plurality of subcarriers with equal intervals, and its f...

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Abstract

An evolution system, frame compatible with diverse frequency range Wimax systems and a production method thereof are disclosed, sub-carrier wave and circulation prefix of the compatible Wimax system are the same as each other, number N of the evolution system IFFT is determined to be larger than or equal to sum of numbers of IFFTs corresponding to each compatible Wimax system; in accordance with the number and spacing of the sub-carrier wave of the Wimax system, transmission rate of the evolution system is obtained; data points of the signal are transmitted according to the transmission rate as well as coded and modulated; the data points carrying information of diverse frequency range Wimax systems are arrayed at diverse positions of N point IFFT in terms of each system frequency range, these position are not mutually superposed; the arrayed N data points is performed IFFT operation of N point at each time so as to transform to OFDM time frequency symbols, and the circulation prefix having the length same as the Wimax system is added to the OFDM symbols which is then transmitted; a plurality of symbols combine into a frame. The invention enables the terminals of diverse frequency range Wimax systems to be accessible to the evolution system.

Description

technical field [0001] The invention relates to the field of digital communication, in particular to a new system compatible with Wimax (Worldwide Interoperability for Microwave Access) systems in different frequency bands, a frame and a frame generation method. Background technique [0002] As a multi-carrier transmission mode, Orthogonal Frequency Division Multiplexing (OFDM: Orthogonal Frequency Division Multiplexing) makes the system frequency-selective to multipath fading channels by converting a high-speed transmission data stream into a set of low-speed parallel transmission data streams. The sensitivity of OFDM is greatly reduced, and the introduction of cyclic prefix further enhances the ability of the system to resist inter-symbol interference. In addition, the high bandwidth utilization rate and simple implementation make OFDM more and more widely used in the field of wireless communication. . [0003] Wimax is a broadband wireless access technology based on OFDM...

Claims

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Application Information

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IPC IPC(8): H04L12/28H04L27/26H04L1/00H04L12/56
Inventor 谢大雄郁光辉夏树强胡留军
Owner 徐州铁手五金工具制造有限公司
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