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Method for modeling ultra wide-band (UWB) compressive sensing wireless channel

A compressed sensing, wireless channel technology, applied in the field of communication, to achieve the effect of flexible and reduced sampling rate

Inactive Publication Date: 2012-04-18
BEIJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

Since the sweep time in the frequency domain measurement must be less than the coherence time of the channel, too many sweep points limit the channel measurement method in the frequency domain to only measure static channels

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  • Method for modeling ultra wide-band (UWB) compressive sensing wireless channel

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Embodiment Construction

[0035] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and implementation methods, taking UWB channel modeling conforming to the Chinese UWB spectrum specification as an example. It should be pointed out that it is only used to explain the present invention, not to limit the present invention.

[0036] Please refer to figure 1 , is a block diagram of the UWB channel frequency domain measurement system adopted in the present invention. The embodiments of the present invention measure various types of environments such as offices, residences, and outdoor open spaces, and classify the measurement data into two situations, LOS and NLOS. The measurement parameters are the measurement frequency band 2.3-11GHz, the number of transmitted single-frequency signals is 5600, the sweep interval is 1.5536MHz, the transmission power ...

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Abstract

The invention discloses a method for processing the channel measurement data of an ultra wide-band (UWB) compressive sensing frequency domain and belongs to the field of communication. The method comprises the following steps of: for UWB channel measurement data in a mode of frequency domain measurement, designing a window function to intercept the channel measurement data of a target frequency range; by using a time domain pulse which corresponds to the window function as prior information, constructing an ultra-complete waveform dictionary to make a time domain channel measurement signal more sparsely represented; by using a greed tracking algorithm as a compressive sensing reconstruction algorithm and reconstructing the time domain channel measurement signal, finishing deconvolution of the signal so as to reduce the sampling rate of measurement equipment on the premise of no reduction of deconvolution accuracy. The invention also discloses a method for modeling a UWB compressive sensing multi-path channel. By using the characteristic of a correspondence relationship between the success reconstruction probability of a group of channel measurement data in a compressive sensing theory and observation sample number, and the characteristic of limitation on the success reconstruction probability by channel average multi-path number, a relationship model between the observation sample number and the channel average multi-path number is established.

Description

Technical field: [0001] Based on the compressed sensing (CS, Compressive Sensing) theory, the present invention proposes an ultra-wideband (UWB, Ultra Wide-Band) wireless channel modeling method, which belongs to the communication field. technical background: [0002] UWB technology is a new type of wireless communication technology that uses spectrum resources in a stacked manner, and its transmission signal bandwidth can be as high as several gigahertz (GHz). According to the UWB spectrum mask specification promulgated by the US FCC and 2002, its absolute bandwidth can reach 7.5Ghz. At present, IEEE has promulgated relevant standards for many application scenarios of UWB, including the high-speed wireless personal area network standard IEEE802.15.3 and the low-speed wireless sensor network standard IEEE802.15.4, as well as the widely researched wireless body area network ( WBAN, Wireless Body Area Network). On December 6, 2008, in order to meet the application requiremen...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W16/22
Inventor 李德建周正李斌蒋挺
Owner BEIJING UNIV OF POSTS & TELECOMM
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