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Method and device of iteration channel estimation based on asymmetrical training sequence filled block transmission system

A training sequence and channel estimation technology, applied in the field of iterative channel estimation, can solve the problems of reducing the spectral efficiency of the system, reducing the channel estimation performance, and resisting the shortening of the maximum multipath delay, so as to improve the channel estimation accuracy and improve the maximum multipath time delay. The effect of elongation and improving the time-varying performance of the system

Active Publication Date: 2013-04-24
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to windowing, the training sequence of the frame body no longer conforms to the cyclic prefix structure, resulting in shortened resistance to maximum multipath delay, reduced channel estimation performance, and reduced system spectral efficiency.

Method used

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  • Method and device of iteration channel estimation based on asymmetrical training sequence filled block transmission system
  • Method and device of iteration channel estimation based on asymmetrical training sequence filled block transmission system
  • Method and device of iteration channel estimation based on asymmetrical training sequence filled block transmission system

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Embodiment 1

[0065] Such as figure 2 Shown is a schematic diagram of a frame structure of a dual-PN TDS-OFDM system applicable to PLC in this embodiment.

[0066] S0. The signal frame includes a frame header and a frame body. The frame header is composed of the first training sequence and the second training sequence. The length of the second training sequence is N, and the frame body is a single carrier data block or OFDM data block. ;

[0067] In this embodiment, the guard interval Contains two identical training sequences of length N=255, of which the frequency domain of the two training sequences is a PN sequence of length N=255 Of course, for the convenience of distinction, we still remember that the length of the first training sequence is L, and the length of the second training sequence is N, where N=L. However, in order to improve the effect of the notch, the first W / 2=32 symbols of the first training sequence have been windowed, so the first and second training sequences lo...

Embodiment 2

[0100] Such as Figure 5 Shown is a schematic diagram of a frame structure of a TDS-OFDM system in this embodiment.

[0101] S0. The signal frame includes a frame header and a frame body. The frame header is composed of the first training sequence and the second training sequence. The length of the second training sequence is N, and the frame body is a single carrier data block or OFDM data block. ;

[0102] In this embodiment, the guard interval Including two training sequences, the second training sequence is a time-domain PN sequence with a length of N=511 The first training sequence is composed of the last L=434 symbols of the second training sequence, which can be understood as the cyclic extension of the second training sequence. Obviously, the first and second training sequences lose their equivalence, so The first and second training sequences are denoted as with The frequency domain symbol to be transmitted in the i-th frame is S i (k), appropriate coding, i...

Embodiment 3

[0135] Such as Image 6 Shown is a schematic diagram of a frame structure of a TDS-SC-FDE system in this embodiment.

[0136] S0. The signal frame includes a frame header and a frame body. The frame header is composed of the first training sequence and the second training sequence. The length of the second training sequence is N, and the frame body is a single carrier data block or OFDM data block. ;

[0137] In this embodiment, the guard interval Including two training sequences, the second training sequence is a time-domain PN sequence with a length of N=255 The first training sequence is composed of the last L=165 symbols of the second training sequence, which can be understood as the cyclic extension of the second training sequence. Obviously, the first and second training sequences lose their equivalence, so The first and second training sequences are denoted as with Using single-carrier transmission, the symbols to be transmitted in the i-th frame are processed ...

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Abstract

The invention discloses a method and a device of iteration channel estimation based on an asymmetrical training sequence filled block transmission system. The method comprises the following steps: S0, a signal frame comprises a frame head and a frame body, the frame head is composed of a first section training sequence and a second training sequence, the length of the second training sequence is N, and the frame body is single carrier data block or orthogonal frequency division multiplexing (OFDM) data block; S1, an initial estimation result of frame channel impulse response is obtained; S2, the second section training sequence and the first section training sequence of the current signal frame are decreased gradually, the sequence which is decreased and the estimated linear convolution of the channel are calculated, the sequence after an Nth signal of a linear convolution is used as a reconstruction item of the second section training sequence; S3, according to the reconstruction item, the second section training sequence and the circulating convolution of the channel impact response are reconstructed; S4, channel estimation is conducted by using the reconstructed circulating convolution, the estimation result of the channel impact response is updated, and postprocessing of the channel estimation is conducted; and S5, the estimation result of the channel impact response is output or the step S1 is returned.

Description

technical field [0001] The invention belongs to the technical field of digital signal transmission, and in particular relates to an iterative channel estimation method and a device thereof based on an asymmetric training sequence filling block transmission system. Background technique [0002] In broadband high-speed wireless data transmission, there is serious multipath fading, which causes frequency selective fading and ISI (Inter Symbol Interference, intersymbol interference) to affect the quality of data transmission. In terms of combating multipath fading channels, the basic transmission technologies can be divided into two categories: multi-carrier and single-carrier, the most representative of which are Orthogonal Frequency Division Multiplexing (OFDM) technology and single-carrier frequency domain Equalization (Single Carrier Time-Domain Equalization, SC-FDE) technology. OFDM and SC-FDE technologies are considered to be very promising block transmission technologies...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/02H04L25/03
Inventor 杨昉丁文伯宋健阳辉
Owner TSINGHUA UNIV
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