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Time delay estimation method based on short wave diversity signals

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: 2019-08-13
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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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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  • Time delay estimation method based on short wave diversity signals
  • Time delay estimation method based on short wave diversity signals
  • Time delay estimation method based on short wave diversity signals

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Embodiment Construction

[0024] The technical solutions of the present invention will be described in detail below with reference to the accompanying drawings and embodiments. However, it should not be construed that the scope of the above-mentioned subject of the present invention is limited to the following Example , all technologies realized based on the content of the present invention belong to the scope of the present invention.

[0025] The simulation parameters are set as follows:

[0026] Taking a 2FSK modulated signal as an example, set the symbol rate Symr=200sps, the sampling frequency Fs=9600Hz, and the number of sampling points in one symbol Nsamp=48. The selected simulation channel is a frequency selective fading channel with interference in the mid-latitude, and the channel model is as follows figure 2 shown. Suppose input signal: s(t)=cos(2πft) or s(t)=e j2πft . τ is the multipath delay, f d is the maximum Doppler frequency shift, The fading characteristics of the shortwave ...

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Abstract

The invention discloses a multipath time delay estimation method based on multipath diversity signals under a short wave channel, belongs to the technical field of channel parameter estimation in wireless communication, and relates to an estimation method based on multipath diversity signals, low in complexity and free of channel prior information time delay. Under the condition of non-data assistance, independent and fading-irrelevant signals are counted only by means of single-channel data and by means of multiple channels carrying the same information, and poor transmission characteristicsof short wave channels can be favorably resisted by means of a segmented frequency domain matching and related crowd taking method, so that estimation of multipath time delay and relative time delay is completed. Simulation results show that when the signal-to-noise ratio is low and the estimation precision is only 10 <-4 > s magnitude, the estimation of the multipath time delay and the signal relative time delay can still keep high accuracy..

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, with low complexity and without channel prior information delay. Background technique [0002] In shortwave communication, there are many problems such as multipath delay, Doppler frequency shift and frequency selective fading, which bring great difficulties to the reception and processing of signals. Therefore, diversity technology is often used to combat the poor transmission of the channel. characteristic. The present invention just utilizes the diversity signal, and can complete the estimation of the multipath delay of the channel parameters and the relative delay of the diversity signal without testing or pilot sequence. [0003] Diversity technology is a method to improve the correct decision rate of the received signal by providing multiple copies of the transmitted...

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Application Information

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Patent Type & Authority Applications(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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