Method for synchronizing base stations

A technology for synchronizing base stations and base stations, which is applied in the direction of synchronization devices, communication between multiple stations, transmission systems, etc., and can solve problems such as loss of autocorrelation characteristics

Inactive Publication Date: 2002-05-01
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Also, the choice of sequence lengths is reduced, since they can, as stated, only take the value 2 N -1, and truncation would result in a substantial loss of autocorrelation properties

Method used

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  • Method for synchronizing base stations
  • Method for synchronizing base stations
  • Method for synchronizing base stations

Examples

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Embodiment Construction

[0023] The general idea underlying the invention is to use a pair of complementary polyphase codes and more specifically a pair of Golay complementary codes for synchronizing neighboring base stations. In the rest of the description, it is not polyphase codes but Golay codes. However, it is clear that the invention is applicable to polyphase codes in general.

[0024] These complementary codes, as known herein, have the remarkable property that the sum of their aperiodic autocorrelation functions is a Dirac function. In other words, if a pair of such complementary codes is denoted as (A, B), we get  AA (m)+ BB (m)=δ(m), where m is the time label, δ is the Kronecker symbol, and  is the aperiodic autocorrelation function.

[0025] In addition, as in the article entitled "Efficient pulse compressor for Golay complementary sequences (Efficient pulse compressor for Golay complementary sequences)" in Eletronics Letters Vol.27 No.3, pp. 219-220, published in January 1991, S.Z. ...

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Abstract

Method of synchronising base stations in a mobile radio telecommunication system, characterised in that a first base station transmits a synchronisation sequence having a first sequence followed by a second sequence, the said first and second sequences being obtained from polyphase complementary sequences and in that at least one second base station effects the correlation of the said synchronisation sequence with a replica of the first sequence and a replica of the second sequence, the correlation results then being added in order to provide synchronisation information.

Description

technical field [0001] The invention relates to a method for synchronizing base stations in a mobile radio telecommunication system. In particular, the invention relates to a method of synchronizing base stations for a time division duplex (TDD) type telecommunication system. The telecommunication system may for instance be the system for which a standard commonly referred to as 3GPP W-CDMA TDD is currently being drafted. Background technique [0002] figure 1 A radio frame of such a telecommunication system is illustrated. It contains fifteen time slots, some of which, such as IT 0 , IT 1 , IT 2 , IT 5 , IT 6 and IT 8 , used to transmit data (generalized data) in the downlink direction (base station to mobile terminal), while other time slots, IT 3 , IT 4 , IT 7 , IT 9 , IT 10 , IT 11 , IT 12 , IT 13 and IT 14 , used to transmit data in the uplink direction (mobile station to base station). In a transmission slot, data (D) is transmitted in the form of a s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L7/00H04B1/707H04B1/7075H04B1/7077H04B1/708H04B7/216H04B7/26H04J13/00H04J13/10H04W56/00H04W92/00
CPCH04B1/70754H04B7/2693H04J13/102H04J13/0014H04B2201/70701H04L7/042H04B1/708H04J13/107H04B1/7077H04B7/2687H04B7/2668
Inventor M·鲁多尔夫B·杰乔西
Owner MITSUBISHI ELECTRIC CORP
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