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Frequency domain channel estimation method based on two-value full-pass sequence protection interval filling

A technology of guard interval and frequency domain channel, which is applied in the field of digital information transmission and can solve problems such as affecting the accuracy of channel estimation and training sequence distortion.

Active Publication Date: 2008-01-09
TSINGHUA UNIV
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Problems solved by technology

[0005] The training sequence filled with the guard interval will produce distortion in the case of noise and data interference, which seriously affects the channel estimation accuracy based on the training sequence

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  • Frequency domain channel estimation method based on two-value full-pass sequence protection interval filling
  • Frequency domain channel estimation method based on two-value full-pass sequence protection interval filling
  • Frequency domain channel estimation method based on two-value full-pass sequence protection interval filling

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Embodiment Construction

[0055] The purpose of the present invention is to propose a new guard interval filling method based on the training sequence, which can be used in single carrier and multi-carrier systems, and the specific implementation in digital integrated circuits or computers is as follows:

[0056] Definition of BAP sequence The present invention proposes a new training sequence, binary all-pass sequence (BinaryAll Pass, BAP). The Discrete Fourier Transform (DFT) that defines the BAP sequence has only two values, +1 or -1. For example, the inverse discrete Fourier transform (Inverse Discrete Fourier Transform, DFT) of the PN sequence is the BAP sequence.

[0057] BAP Sequence Search Peak-to-average ratio is an important characteristic of multi-carrier and single-carrier wireless systems. Considering that the peak-to-average ratios of different BAP sequences are very different, the present invention proposes a method to simplify the search for the BAP sequence with the smallest peak-to-a...

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Abstract

The invention is concerned with the space protection filling method of the training sequence for the single or multi-carrier wave radio communication system with multi-pathway interference. It is to achieve compatible of the single-single carrier wave modulating system of the BAP sequence and the PN sequence. The definition of the new training sequence is the Binary All Pass, BAP. Its average peak ratio closes to the least BAP sequence because its anti-dispersing Transformee de Fourier is the PN sequence. The BAP sequence is with invariableness frequency domain, like low average peak ratio and so on.

Description

technical field [0001] The invention belongs to the technical field of digital information transmission, in particular to an Orthogonal Frequency Division Multiplexing (OFDM) multi-carrier system (Multi Carrier, MC) or a single carrier (Single Carrier, SC) system based on a training sequence (Training Sequence , TS) guard interval filling method. Background technique [0002] The main problem to be solved by the current wireless communication technology is how to reliably increase the transmission rate within the limited bandwidth. Single-carrier and multi-carrier modulation systems will produce frequency-selective fading under multi-path transmission channels, that is, Inter Symbol Interference (ISI), which will cause Inter Block Interference (Inter Block Interference) for systems that transmit in units of data blocks. , IBI), as shown in Figure 1.a. [0003] One way to combat multipath interference is to add a guard interval (Guard Interval, GI) between transmitted data ...

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Application Information

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IPC IPC(8): H03M13/15H03M13/23H04L27/26
Inventor 杨知行彭克武宋健王军王劲涛潘长勇张彧阳辉
Owner TSINGHUA UNIV
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