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Anti-interference single carrier channel estimation and equalization method and device

A technology of channel estimation and equalization method, applied in the field of communication, which can solve the problems of poor performance and inability to meet communication requirements well, and achieve the effects of simplifying the frame structure, saving time-domain chip resources, and suppressing power spectrum components

Active Publication Date: 2017-05-31
SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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Problems solved by technology

[0004] Although the relevant channel estimation and equalization technologies are relatively mature, they cannot well meet the communication requirements in complex electronic environments. If there is interference from other systems or electronic countermeasures in the working frequency range, the performance will be poor. Therefore, traditional channel estimation There are still many key difficulties to be solved and perfected in the balance technology

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  • Anti-interference single carrier channel estimation and equalization method and device
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  • Anti-interference single carrier channel estimation and equalization method and device

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specific Embodiment

[0030] The device of the present invention is applied to a single-carrier communication system, and is realized by DFT-S-OFDM single-carrier modulation technology, and the number of DFT points is 1024, and the number of IDFT points is 2048. Its transmission signal waveform has a low PARR (peak-to-average ratio), which can avoid the problems of RF power amplifier device distortion and low conversion efficiency caused by too high peak-to-average ratio, so that the system can be used under the same power consumption. Cover a wider area. The specific implementation process of the anti-interference channel estimation and equalization of the present invention is as attached Figure 8 As shown, the implementation steps include:

[0031] Step S1, generating a local frequency domain pilot. The local pilot is composed of a complex symbol p=(1+i) / 2 through a length of 1024 and all 1 After sequence spreading, and after Sequence scrambling is obtained, where for scrambling The sequ...

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Abstract

The invention provides an anti-interference single carrier channel estimation and equalization method and device. The apparatus includes a first Fourier transform module, an LS frequency domain channel estimation module, an interference position detection module, and a white noise suppression module which are connected in sequence. The white noise suppression module is used for performing noise suppression after the time domain transformation and then transforming the frequency domain. The white noise suppression module comprises a Fourier transform module, a time domain noise reduction processing module, and a second Fourier transform module which are connected in sequence. The device also comprises an interference suppression module which is connected with output ends of the white noise suppression module and the interference position detection module. The technical scheme adopts anti-interference optimization to complex interference environments. The system utilizes the characteristics of the cyclic code division multiple access frequency domain channel estimation and the strong interference detection algorithm to track the amplitude-phase characteristics of the in-band frequency point channel, automatically detect the interference frequency range, and suppress the power spectrum components of the interference, thus effectively eliminating the impact of in-band interference on the system and improving the reliability of wireless communication links.

Description

technical field [0001] The present invention relates to a communication technology, which is a frequency domain channel estimation and equalization technology in a wireless spread spectrum communication system, in particular to a channel estimation and equalization method and device capable of suppressing white noise and resisting single-frequency and narrow-band interference. Background technique [0002] Since the 21st century, aerospace technology and UAV technology have developed rapidly, and the communication environment in related fields has become even harsher. In key communication technologies such as channel estimation and equalization, there are still many technical difficulties to be solved and improved. [0003] At present, the research on channel estimation and equalization technology at home and abroad is relatively extensive. The research hotspots focus on channel estimation technology based on pilot sequence. It can be divided into two categories: one is the...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/02H04L25/03
CPCH04L25/0202H04L25/03159H04L25/03878
Inventor 张龙田朝阳杜翀
Owner SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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