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A Time Delay Estimation Method Based on HF Diversity Signal

A short-wave channel and signal technology, applied in baseband systems, baseband system components, digital transmission systems, etc., can solve problems such as difficult to achieve, and achieve the effect of small algorithm complexity, accurate estimation, and high accuracy

Active Publication Date: 2021-03-30
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Description
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  • Application Information

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Problems solved by technology

There are many classic algorithms under these three types of models: such as correlation algorithms, algorithms based on cost functions, and algorithms based on signal space characteristics, etc., but these algorithms require the receiver to know the special test sequence or pilot signal sent. However, this requirement is difficult to meet in non-cooperative communication

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  • A Time Delay Estimation Method Based on HF Diversity Signal
  • A Time Delay Estimation Method Based on HF Diversity Signal
  • A Time Delay Estimation Method Based on HF Diversity Signal

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Embodiment Construction

[0023] The technical scheme of the present invention will be described in detail below in conjunction with the accompanying drawings and embodiments. However, it should not be understood that the scope of the above-mentioned subject of the present invention is limited to the following examples, and all technologies realized based on the content of the present invention belong to the scope of the present invention.

[0024] The simulation parameters are set as follows:

[0025] Taking the 2FSK modulation signal as an example, set the symbol rate Symr=200sps, the sampling frequency Fs=9600Hz, and the number of sampling points Nsamp=48 in one symbol. The selected simulation channel is a frequency selective fading channel with interference in mid-latitude, and the channel model is as follows: figure 2 shown. Suppose the input signal: s(t)=cos(2πft) or s(t)=e j2πft . τ is the multipath delay, f d is the maximum Doppler shift, Describes the fading characteristics of the shor...

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Abstract

The invention discloses a method for estimating multipath time delay based on multi-path diversity signals in a shortwave channel, which belongs to the technical field of channel parameter estimation in wireless communication, and relates to a method based on multi-path diversity signals with low complexity and without channel prior Estimation method of information delay. In the case of non-data assistance, only relying on single-channel data, using multiple channels to carry the same information, counting independent and fading uncorrelated signals, and using the method of segmented frequency domain matching correlation to take the mode, can be beneficial to combat bad transmission of short-wave channels Features, to complete the estimation of multipath delay and relative delay. Simulation results show that: at a lower SNR, the estimation accuracy is only 10 ‑4 When the magnitude of s, the estimation of multipath time delay and signal relative time delay can still maintain a high accuracy rate.

Description

technical field [0001] The invention belongs to the technical field of channel parameter estimation in wireless communication, and relates to an estimation method based on multi-channel diversity signals, low in complexity, and without channel prior information time delay. Background technique [0002] In short-wave communication, there are many problems such as multipath delay, Doppler frequency shift and frequency selective fading, which bring great difficulties to signal reception and processing, so diversity technology is often used to combat the bad transmission of channels characteristic. The present invention just utilizes the diversity signal, and can complete the estimation of the channel parameter multipath time delay and the relative time delay of the diversity signal without testing or pilot sequence. [0003] Diversity technology is a method of improving the correct judgment rate of received signals by providing multiple copies of transmitted signals, which is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/02
CPCH04L25/0222
Inventor 张存林董彬虹曹蕾蔡沅沅李昊
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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