Channel estimation method based on circuit training sequence

A channel estimation and training sequence technology, which is applied in baseband system components, shaping network in transmitter/receiver, multi-frequency code system, etc., can solve the problem that the estimation performance is difficult to meet the actual requirements, and achieve simple and effective compensation, Significant noise suppression and low complexity effects

Inactive Publication Date: 2013-07-31
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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The LS method is characterized by simple calculation and easy implementat...

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  • Channel estimation method based on circuit training sequence
  • Channel estimation method based on circuit training sequence
  • Channel estimation method based on circuit training sequence

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Embodiment Construction

[0046] Taking an OFDM system for power line carrier communication as an example, the specific configuration of the parameters of the channel estimation part of the system is given below, and the specific implementation steps of the present invention are described.

[0047] There are 36 subcarriers in this OFDM system, and the number of FFT points is 256; the basic sequence p(n) is obtained by performing 256-point IFFT on P(k) modulated on 36 available subcarriers. Table 1 shows the P(n) of this system k) sequence, wherein 23≤k≤58, that is, the distribution of 36 subcarriers; the training sequence is composed of 2 basic sequences; the maximum time delay L of the channel max It is 18 sampling points, that is, 45μs. The specific channel delay power spectrum model is shown in Table 2.

[0048] Table 1 Basic sequence P(k) defined in the frequency domain

[0049]

[0050] Table 2 Channel delay power spectrum model

[0051]

[0052] The received sequence passes through a mat...

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Abstract

The invention provides a channel estimation method based on a circuit training sequence. According to the method, output matched with a filter (related device) is subjected to interception and zero fill by taking a related peak as a center at a receiving end, so that a time domain denoising effect is achieved; and the sequence subjected to interception and zero fill is compensated in a frequency domain, so that energy loss caused by zero fill is reduced.

Description

technical field [0001] The present invention relates to various digital communication systems, including wireless communication systems and wired communication systems. Wireless communication systems such as mobile communication systems and wireless local area networks, etc., wired communication systems such as coaxial cables, telephone lines, and power line communication systems. It is especially concerned with the problem of channel estimation based on cyclic training sequences in single-carrier or multi-carrier systems. Background technique [0002] There are often multiple propagation paths between the transmitter and receiver of a communication system. This multipath channel causes serious distortion to the frequency spectrum of the transmitted signal, that is, the multipath channel causes frequency selective distortion of the transmitted signal. How to solve the frequency selectivity problem of multipath channel is a challenge faced by communication system design. Ch...

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Application Information

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IPC IPC(8): H04L27/26H04L25/03
Inventor 徐大专查佳佳王荣军张小飞
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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