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Evolvement system being compatible with variable bandwidth Wimax system, wireless frame as well as generating method thereof

An evolutionary system and wireless frame technology, applied in the field of wireless frame and wireless frame generation, can solve problems such as restricting the development of Wimax, and achieve the effect of improving spectrum utilization

Inactive Publication Date: 2008-10-08
ZTE CORP
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  • Summary
  • Abstract
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  • Claims
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Problems solved by technology

[0004] For the Wimax system, Wimax terminals with different bandwidths can only be connected to the system with the corresponding bandwidth, which greatly restricts the development of Wimax

Method used

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  • Evolvement system being compatible with variable bandwidth Wimax system, wireless frame as well as generating method thereof
  • Evolvement system being compatible with variable bandwidth Wimax system, wireless frame as well as generating method thereof
  • Evolvement system being compatible with variable bandwidth Wimax system, wireless frame as well as generating method thereof

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Embodiment Construction

[0034] Multiple Wimax systems with different bandwidths described in the present invention can use various bandwidths defined by Wimax, but Wimax with different bandwidths should use the same group of bandwidths, that is, there is a relationship of integer multiples of 2 between the two bandwidths. To access the same evolved system, the bandwidth of the wireless frame of the evolved system is greater than or equal to the sum of the compatible Wimax system bandwidths, the transmission frequency band needs to cover the frequency bands of these Wimax systems, and some Wimax system wireless frames need to be extended in the structure of the wireless frame The basic feature of the present invention is the same as the Wimax system, using OFDM technology when modulating.

[0035] Referring to the radio frame structure shown in FIG. 3 , a radio frame has a frame length of 5 ms (not limited thereto), a bandwidth of 44.8 MHz, and includes multiple subcarriers at equal intervals. Its fre...

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Abstract

The invention provides a wireless frame production method of an evolution system compatible with diverse bandwidth Wimax systems, sub-carrier wave and circulation prefix of the compatible Wimax system are the same as each other, the method comprising the following steps of: (a) determining that number of rapid Fourier inverse conversion should be larger than or equal to sum of IFFT numbers corresponding to each compatible Wimax system; multiplying the number by sub-carrier wave spacing of the Wimax system to obtain sampling frequency; (b) coding N sampling points of the obtained transmission signal and using OFDM technology to modulate so that the frequency range of the evolution system covers the frequency range of each compatible Wimax system; (c) arraying the sampling points carrying information of each compatible Wimax system to the positions correposnidng to the frequency range of respective system, these positions are not superposed mutually; (d) performing IFFT arithmetic to the arrayed sampling points to convert into OFDM symbols, and adding the circulation prefixes having the length same as the Wimax system on the OFDM symbols and then sending out.

Description

technical field [0001] The invention relates to the field of digital communication, in particular to a new system compatible with different bandwidth Wimax (Worldwide Interoperability for Microwave Access) systems, a wireless frame and a generation method of the wireless frame. 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 technolo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/28H04L27/26H04L1/00H04L12/56
Inventor 郁光辉
Owner ZTE CORP
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