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Synchronous signal sending and detecting method for orthogonal frequency division complex system

A technology of synchronization signal and detection method, applied in the direction of multi-frequency code system, etc., can solve problems such as troublesome multiplexing of synchronization signal and other signals

Inactive Publication Date: 2007-07-25
ZTE CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method requires standard support, and the synchronization signal is usually only sent on a part of the carrier of the OFDM symbol. This mandatory regulation brings trouble to the multiplexing of the synchronization signal and other signals

Method used

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  • Synchronous signal sending and detecting method for orthogonal frequency division complex system
  • Synchronous signal sending and detecting method for orthogonal frequency division complex system
  • Synchronous signal sending and detecting method for orthogonal frequency division complex system

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Embodiment Construction

[0044] First, two types of cyclic prefixes are taken as examples to illustrate the key steps of the synchronization signal transmission and detection method based on OFDM technology in the present invention:

[0045] (1) Sending: In this system, the size of the FFT is assumed to be 2N, and there are two types of cyclic prefixes, respectively cyclic prefix type 1 and type 2, and the number of samples included in the cyclic prefix are respectively: L1, L2. Without loss of generality, for cyclic prefix type 1, it is assumed that the synchronization signal sent by the system is sent in one OFDM symbol, and its data part is: x(0), x(1)....x(2N-1). And The following conditions are satisfied: x(n)=x(n+N), n=0, 1...N-1. That is, the signal is repeated in the time domain. Let the cross-correlation R(u) between x(0), x(1)...x(N) and its cyclic shift be:

[0046] R ( u ) = Σ n ...

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Abstract

In the invention, the transmitting method comprises: with cyclic shift, letting the peak value of cyclic convolution of circular convolution made for the synchronous signals roughly synchronized at receiving terminal and the local reference signals to be at different positions. The detection method comprises: when making synchronous timing, simultaneously using said positions to detect the cyclic prefix type. By the invention, in the process of getting the synchronous signal timing, the mobile station simultaneously gets the cyclic prefix length type of OFDM symbol so as to have no need to take extra steps used for detecting the cyclic prefix type.

Description

technical field [0001] The invention relates to an orthogonal frequency division multiplexing system, in particular to a method for sending and detecting synchronous signals based on the orthogonal frequency division multiplexing system with multiple cyclic prefixes. Background technique [0002] In an Orthogonal Frequency Division Multiplexing system, each OFDM (Orthogonal Frequency Division Multiplexing) symbol includes two parts: a cyclic prefix part and a data part. The cyclic prefix part is a copy of the part behind the data part, and it has dual functions of resisting inter-symbol interference and inter-carrier interference. Generally speaking, the longer the data of the cyclic prefix part is, the stronger its ability to resist inter-symbol interference and inter-carrier interference is. However, there are also negative effects. The longer the data in the cyclic prefix part, the greater the overhead of the system. In practical applications, in order to reduce the neg...

Claims

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Application Information

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IPC IPC(8): H04L27/26
Inventor 夏树强梁春丽
Owner ZTE CORP
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