Device and method for detecting and using blank frequency spectrum with peak interference
A blank spectrum and peak technology, which is applied in the application field of filter bank in wireless signal detection, can solve the problems of interference and low utilization rate, and achieve the effect of low cost
Inactive Publication Date: 2013-11-13
ZHEJIANG UNIV
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[0004] In the wireless TV broadcast frequency band, due to the low usage rate of the frequency band by TV stations and the conversion from analog TV to digital TV, there will be blank spectrum in the TV band that can be used by other users, but there will be spikes in these blank frequency bands Interference, how to detect these peak interference and avoid the frequency of the interference during use, there is currently no corresponding solution
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[0032] The present invention will be further described below in conjunction with the accompanying drawings and specific examples.
[0033] Such as figure 1 As shown, the present invention detects the blank frequency spectrum with spike interference mainly by the down converter, the analog-to-digital converter and the shift filter group, and the down-converter, the analog-to-digital converter and the shift filter group are connected successively together. Among them, the shift filter bank can realize the detection of the peak interference information in the whole blank frequency spectrum. figure 2 A kind of structure of shift filter bank of the present invention is shown, and this shift filter bank is mainly made up of delayer bank 501, filter bank 502, shifter 503, fast Fourier transform module (IFFT) 504 and the decider 505 are sequentially connected together to form. Among them, the delayer group 501 is composed of a group of delayers, and the filter group 502 is compose...
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The invention discloses a device and method for detecting and using a blank frequency spectrum with peak interference. The device for detecting comprises a lower frequency converter, an analog-digital converter and a phase shift filter bank, which are connected in sequence. The device for detecting and using comprises the lower frequency converter, the analog-digital converter, the phase shift filter bank, a modulation preprocessing module and an orthogonal frequency division multiplexing modulation module, which are connected in sequence. The invention aims at the uncertainty of the bandwidth of the blank frequency spectrum, can effectively use the blank frequency spectrum with peak interference and has low cost. The phase shift filter bank can realize automatic detection of the peak interference in the blank frequency spectrum with bandwidth dynamically changing.
Description
technical field [0001] The invention relates to a device and method for detecting and using a blank frequency spectrum with peak interference, and relates to the technical field of cognitive radio, an OFDM system, and the application of a filter bank in wireless signal detection. Background technique [0002] Since the sub-band digital signal processing was proposed in the 1970s, in the course of decades of development, the research on filter banks has undergone enrichment and improvement from basic theoretical analysis to various theories. Band filter bank theory, structure and design method, its application has also expanded from the initial speech processing to communication, image coding / compression, adaptive filtering, radar, fast calculation, system identification, noise elimination and many other fields. Filter banks generally include analysis filter banks and synthesis filter banks. When using filter banks to transmit and receive signals, signal reconstruction needs ...
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IPC IPC(8): H04L25/03H04L27/26
Inventor 崔云赵志峰周斌陈琴琴吕思达王峰王晓
Owner ZHEJIANG UNIV