Method for capturing carrier frequency bias and time delay of single carrier frequency domain equalizing system

A single-carrier frequency domain, equalization system technology, applied in the field of SC-FDE, can solve the problem of no algorithm and so on

Inactive Publication Date: 2009-04-22
北京韦加航通科技有限责任公司
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  • Abstract
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Problems solved by technology

The synchronization technology of the SC-FDE system is divided into carrier synchronization and timing synchronization. However, in the prior ar

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  • Method for capturing carrier frequency bias and time delay of single carrier frequency domain equalizing system
  • Method for capturing carrier frequency bias and time delay of single carrier frequency domain equalizing system
  • Method for capturing carrier frequency bias and time delay of single carrier frequency domain equalizing system

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[0071] The SC-FDE system is a system of frame transmission, and each frame consists of a preamble block and several data blocks. see figure 1 , the figure is a schematic diagram of the structure of the data block used by the SC-FDE system in the frame transmission process in the present invention. As can be seen from the figure, each data block is composed of useful data and a cyclic prefix, and the cyclic prefix is ​​taken as the length of L symbols The unique word sequence CP, the useful data is N symbol length, and each data block is a vector s with M=L+N symbol length. After s is transmitted through the channel, when the receiving end is sampled by V times, its corresponding sampling The signal flow is r=[r(1), . . . , r(VM)]. see figure 2 , the figure is a schematic diagram of the structure of the preamble block used by the SC-FDE system in the frame transmission process in the present invention. It can be seen from the figure that the preamble block in the SC-FDE syst...

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Abstract

The invention discloses a method used for capturing carrier frequency offset and time delay in a single-carrier frequency domain balancing system, comprising the steps as follows: frame-arrival detection is carried out on the received data; when effective data frame is detected, the frame head position of the data frame is determined roughly; the determined frame head position is used as an initial position to carry out rough frequency offset estimation and compensation on the received data frame; the rough timing estimation is carried out so as to determine the initial position of the data block; the timing deviation is locked within one code element offset; the precise timing estimation is carried out by combining a maximum-likelihood searching method with an O&M timing estimation arithmetic, thus gaining precise code element timing information; precise frequency offset estimation and compensation are carried out; synchronous error lock judgment and correction are carried out. The method designs unique preamble code data form and structure, precisely carries out the estimation and compensation on carrier frequency offset and time delay during the synchronous capturing stage,gains precise carrier frequency offset and timing information, and determines the initial position of Fourier transform windows more exactly.

Description

technical field [0001] The present invention relates to SC-FDE (single carrier system with frequency domain equalization, single carrier frequency domain equalization) technology, in particular to a method for capturing carrier frequency offset and time delay in the SC-FDE system. Background technique [0002] At present, with the rapid increase in the demand for new communication services, higher requirements are placed on the transmission rate of wireless communication systems and wireless local area networks, and the increase in transmission rate brings greater carrier frequency deviation to conventional single-carrier systems. , more serious ISI (intersymbol-interference, intersymbol interference) and other issues. OFDM (Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing) technology can effectively overcome the intersymbol interference caused by frequency-selective weak channels, and has gradually become a research hotspot in the field...

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Application Information

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IPC IPC(8): H04L27/00H04B1/69H04B1/7075
Inventor 吴南润郑波浪方立
Owner 北京韦加航通科技有限责任公司
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