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Channel estimation method based on OFDM transmission technology in aviation communication system

A transmission technology and channel estimation technology, which can be used in baseband system components, multi-frequency code systems, etc., and can solve problems such as large delays

Inactive Publication Date: 2013-12-25
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

[0005] The purpose of the present invention is to provide a channel estimation method based on OFDM transmission technology in the aeronautical communication system, which can solve the problem of large time delay in the aeronautical channel estimation

Method used

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  • Channel estimation method based on OFDM transmission technology in aviation communication system
  • Channel estimation method based on OFDM transmission technology in aviation communication system
  • Channel estimation method based on OFDM transmission technology in aviation communication system

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specific Embodiment approach

[0038] In this embodiment, the Matlab2013a simulation platform is used for running experiments. OFDM system parameters: subcarrier N=1024, cyclic prefix 660, number of pilot symbols N p =256, the number of data symbols is 768, and the symbol period T s =0.05us. p(1),p(2),...,p(N p ) is determined by the position of the subcarrier where the pilot is located, and every group of 4 is evenly distributed in the transmitted signal. The pilot structure is as follows figure 2 shown.

[0039] The wireless channel environment is a Doppler frequency shift of f d =4533.3Hz and maximum multipath delay τ max = 33us aviation two-path channel model, Rice factor (ratio of direct path to reflection path) is 15dB, channel bandwidth W=20MHz. J 1 The value is 11.

[0040] The carrier frequency is 2G, the modulation method is QPSK, 1 / 2 convolutional code, and the interleaving method is 48*32. At this time, the normalized maximum Doppler frequency shift (W / (N*f d )) is 0.23, and the maxim...

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Abstract

The invention belongs to the field of communication, and particularly relates to a channel estimation method of an OFDM technology transmission scheme in an aviation communication system. Based on the features that an aviation channel only has two routines and the feature of linear vibration, the positions of the two routines are found out at first, and apart from the two routines, other routines are set to be zero. Thus, the influences of noise on channel estimation are reduced, the estimation accuracy is improved and also, the pilot frequency amount for estimating massive channel parameters is reduced.

Description

technical field [0001] The invention belongs to the communication field, and in particular relates to a channel estimation method of an OFDM technology transmission scheme in an aeronautical communication system. Background technique [0002] With the further development of global informatization, the demand for aviation communication services has become increasingly urgent. The transmission technology used in the current aviation wireless communication system has been in use since the 1950s and 1960s. Its modulation technology adopts double sideband-amplitude modulation, and the channel spacing bandwidth is 8.33kHz. The minimum transmission bandwidth of the double sideband-amplitude modulation system is 8kHz, and it is impossible to increase the capacity of the communication system by reducing the channel spacing. So far, double sideband - amplitude modulation communication technology has been developed to the end. In order to meet the needs of VHF aeronautical wireless ...

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Application Information

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IPC IPC(8): H04L27/26H04L25/02
Inventor 谭黎明王军陈亚丁李少谦
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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