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Channel Estimation Method Based on Pilot Block 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: 2015-12-02
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

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  • Channel Estimation Method Based on Pilot Block in Single Carrier Frequency Domain Equalization System
  • Channel Estimation Method Based on Pilot Block in Single Carrier Frequency Domain Equalization System
  • Channel Estimation Method Based on Pilot Block in Single Carrier Frequency Domain Equalization System

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Embodiment Construction

[0021] The present invention will be further described below in conjunction with the accompanying drawings.

[0022] 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 transmitter, the encoded data is mapped to form a data block with a length of N, and the last N of each data block is g A symbol is copied to the front of the data block as CP (CyclicPrefix, cyclic prefix), and the data block is framed according to the frame format and transmitted after shaping and filtering. At the receiving end, after the data undergoes matched filtering, synchronization, and CP removal operations, it is transformed into the frequency domain through FFT, and after channel estimation and equalization processing in the frequency domain, it is returned to the time domain through IF...

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Abstract

The invention discloses a channel estimation method based on a pilot frequency block in a single carrier frequency domain equalizing system. The method includes the steps of forming a long frame by more than one data block, inserting a unique word (UW) sequence which is composed of a plurality of UWs in each long frame, and combining two UWs as a group to form a periodic pilot frequency block; in channel estimation, firstly estimating a noise variance of a channel by utilizing periodicity of the pilot frequency block, then solving frequency responses of each component channel by utilizing an LS algorithm, setting a threshold value according to the estimated variance after backing to a time domain through an inverse discrete fourier transform (IDFT) / an inverse fast discrete fourier transform (IFFT), conducting noise suppression treatment on impulse responses of the channel, and finally estimating the frequency responses of the channel after transforming a discrete fourier transform (DFT) / a fast discrete fourier transform (FFT) to a frequency domain. According to the channel estimation method based on the pilot frequency block in the single carrier frequency domain equalizing system, aiming at characteristics of a slowly fading channel, a traditional single carrier frequency domain equalization (SC-FDE) frame structure is improved, therefore, a channel estimation algorithm based on the DFT is improved, meanwhile, the frequency responses and the noise variance of the channel are estimated, and performance of the algorithm is improved.

Description

technical field [0001] The invention relates to a channel estimation algorithm of a single-carrier frequency domain equalization system suitable for slow fading channels, which belongs to wireless communication technology. Background technique [0002] In wireless communication, due to multipath effects, intersymbol interference will occur. 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 maps the serial-to-parallel transformed signal to multiple subcarriers through IFFT (Inverse Fast Discrete Fourier Transform), and each subcarrier occupies a very narrow bandwidth. Spectrum utilization. However, the PAPR (Peak-to-averagePowerRatio, peak-to-average ratio) of the OFDM signal is too large, which requires a high linear range of the amplifier...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/02H04L27/26
Inventor 张萌蔡琰时龙兴
Owner SOUTHEAST UNIV
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