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Channel estimation method based on unique word in single carrier frequency domain equalization system

A single-carrier frequency domain, channel estimation technology, applied in the field of wireless communication, channel estimation algorithm, can solve the problem that the channel noise cannot be estimated, and achieve the effect of improving performance

Inactive Publication Date: 2013-08-28
SOUTHEAST UNIV
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Problems solved by technology

This algorithm can effectively improve the accuracy of channel estimation, but it cannot estimate the channel noise variance

Method used

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  • Channel estimation method based on unique word in single carrier frequency domain equalization system
  • Channel estimation method based on unique word in single carrier frequency domain equalization system
  • Channel estimation method based on unique word in single carrier frequency domain equalization system

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Embodiment Construction

[0041] The present invention will be further described below in conjunction with the accompanying drawings.

[0042] The schematic diagram of the single-carrier frequency domain equalization system is as follows figure 1 As shown, in practical applications, in order to reduce the implementation complexity, FFT is usually used instead of DFT, and IFFT is used instead of IDFT. At the transmitting end, the encoded data is mapped to form a data block of length N, and the last N of each data block is g The symbols are copied to the front of the data block as a CP (Cyclic Prefix, cyclic prefix), and the data block is framed according to the frame format and transmitted after shaping filtering. At the receiving end, after matched filtering, synchronization and CP removal, the data is transformed to the frequency domain through FFT, and after channel estimation and equalization processing in the frequency domain, it is returned to the time domain through IFFT for judgment and decodin...

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Abstract

The invention discloses a channel estimation method based on a unique word in a single carrier frequency domain equalization system. The channel estimation method comprises the following steps: designing a frame structure, estimating noise variance and estimating channel frequency response. In the process of designing the frame structure, more than one data block forms a long frame, and a section of UW sequence formed by a plurality of UWs is inserted in each long frame. In the process of channel estimation, firstly an LS algorithm is used for determining a frequency response value of each sub-channel, the frequency response value goes back to a time domain through IDFT / FFT, the noise variance is estimated according to a channel pulse response value which exceeds a cyclic prefix length, then noise reduction treatment is conducted on the channel pulse response value, eventually the channel pulse response value is converted to a frequency domain through DFT / FFT, and channel frequency response values are estimated. According to the channel estimation method based on the unique word in the single carrier frequency domain equalization system, specific to characteristics of slow fading channels, a traditional SC-FDE frame structure is improved, a channel estimation algorithm based on DFT is improved on the basis, and meanwhile the frequency response and the noise variance of the channel are estimated, and therefore the performance of the algorithm is improved.

Description

technical field [0001] The invention relates to a channel estimation algorithm for a single carrier frequency domain equalization system suitable for slow fading channels, and belongs to wireless communication technology. Background technique [0002] In wireless communication, intersymbol interference occurs due to multipath effects. OFDM (Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing) and SC-FDE (Single Carrier Frequency Domain Equalization, Single Carrier Frequency Domain Equalization) technologies are two effective ways to combat multipath effects. [0003] The OFDM system uses IFFT (Inverse Fast Discrete Fourier Transform, Inverse Fast Fourier Transform) to map the serial-parallel transformed signal to multiple sub-carriers, each sub-carrier occupies a very narrow bandwidth, and the spectrum of each sub-carrier overlaps with each other but keeps the Orthogonal, improving spectrum utilization. However, the PAPR (Peak-to-average ...

Claims

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Application Information

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IPC IPC(8): H04L25/02
Inventor 张萌蔡琰潘旭章玮贺秋荣宋慧滨
Owner SOUTHEAST UNIV
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