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Wireless time-varying channel estimation method for SC-FDE system

A SC-FDE and time-varying channel technology, applied in the field of communication, can solve problems such as distortion of short-wave received signals, and achieve the effect of improving estimation accuracy

Inactive Publication Date: 2019-09-17
SUN YAT SEN UNIV
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Problems solved by technology

At the same time, rapid changes in the ionosphere will lead to Doppler frequency shift and Doppler spread, resulting in distortion of shortwave received signals, which is also time-varying

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  • Wireless time-varying channel estimation method for SC-FDE system
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  • Wireless time-varying channel estimation method for SC-FDE system

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[0055] The present invention will be further described below in conjunction with the accompanying drawings, so as to further explain the technical features and advantages of the method of the present invention. However, embodiments of the present invention are not limited thereto.

[0056] The present invention provides a high-precision, low-complexity SC-FDE system wireless time-varying channel estimation method, and the specific implementation steps are as follows:

[0057] 1. Insert the training sequence after the unknown data in each data frame

[0058] According to the structure requirements of the data frame of the US military standard MIL_STD_188_110C, the data frame structure is as follows figure 2 As shown, a training sequence of length P is inserted after the unknown data of each data frame. P is greater than the number of channel paths L. The training sequence adopts the Chu sequence with constant amplitude and strong autocorrelation. The expression of the Chu seq...

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Abstract

The invention relates to a wireless time-varying channel estimation method for an SC-FDE system. The wireless time-varying channel estimation method comprises the following steps: 1) inserting a training sequence with a certain length after unknown data of a transmitting end according to a transmission data frame structure specified by an American military standard MIL-STD_188_110C of a third-generation short wave communication system; 2) approximating the change of channel response in the received training sequence by using a linear function to obtain a channel coefficient at the midpoint moment in each training sequence; 3) in a time frame (generally a transmission block), establishing a BEM model by using the channel coefficient of each training sequence at the midpoint moment, and fitting an impulse response curve at the unknown data; and 4) in the same time frame, eliminating the edge error of the time frame of the BEM model by partially overlapping in the adjacent transmission blocks. Compared with a traditional estimation method, the wireless time-varying channel estimation method is suitable for slow time varying and fast time varying channels at the same time, and the estimation precision is high. When the signal-to-noise ratio is 30dB, compared with a traditional method, the wireless time-varying channel estimation method has the advantage that the estimation precision is improved by about two orders of magnitude. Therefore, the wireless time-varying channel estimation method greatly improves the wireless communication time-varying channel estimation performance of the SC-FDE system.

Description

technical field [0001] The present invention relates to the technical field of communication, and more specifically, to a wireless time-varying channel estimation method based on an SC-FDE system. Background technique [0002] The working frequency of short-wave communication is in the range of 3MHz to 30MHz. It is widely used in various fields such as military communication and emergency communication by virtue of its advantages of simple equipment, flexibility, and strong invulnerability. The short-wave communication system can be mainly divided into two types: multi-carrier modulation and single-carrier modulation. In a wireless communication system, the transmission performance of the system is largely restricted by the wireless channel, and single-carrier frequency domain equalization (SC-FDE), as an anti-multipath interference technology, has the function of orthogonal frequency division with multi-carrier systems. Multiplexing (OFDM) similar system block diagram, whi...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/02
CPCH04L25/0212H04L25/0224H04L25/024
Inventor 何燕妹余宝贤戴宪华
Owner SUN YAT SEN UNIV
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