Method of synchronising base stations

• US 20020039906A1
• Filed: 09/26/2001
• Published: 04/04/2002
• Est. Priority Date: 10/03/2000
• Status: Active Grant

• Current Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Original Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Inventors: Rudolf, Marian, Jechoux, Bruno
• Granted Patent: US 6,922,406 B2
• Time in Patent Office: Days
• US Class Current: 455/502
• CPC Class Codes: H04B 1/70754 Setting of search window, i.e. range of code offsets to be searched H04B1/70758 takes precedence
• CPC Class Codes: H04B 1/7077 Multi-step acquisition, e.g. multi-dwell, coarse-fine or validation
• CPC Class Codes: H04B 1/708 Parallel implementation
• CPC Class Codes: H04B 2201/70701 featuring pilot assisted reception
• CPC Class Codes: H04B 7/2668 Arrangements for Wireless Code-Division Multiple Access [CDMA] System Synchronisation, for code acquisition H04B1/7075, for code tracking H04B1/7085
• CPC Class Codes: H04B 7/2687 Inter base stations synchronisation
• CPC Class Codes: H04B 7/2693 Centralised synchronisation, i.e. using external universal time reference, e.g. by using a global positioning system [GPS] or by distributing time reference over the wireline network
• CPC Class Codes: H04J 13/0014 Golay
• CPC Class Codes: H04J 13/102 Combining codes
• CPC Class Codes: H04J 13/107 by concatenation
• CPC Class Codes: H04L 7/042 Detectors therefor, e.g. correlators, state machines digital correlators in general G06F17/15

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.

Claims

1. 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.

2. Synchrsonisation method according to claim 1, characterised in, that the first and second sequences are Golay complementary sequences.

3. Synchronisation method according to claim 1 or 2, characterised in that the said synchronisation sequence comprises guard times around the first and second sequences.

4. Synchronisation method according to claim 1 or 2, characterised in that the said synchronisation sequence comprises a periodic extension of the first sequence followed by a periodic extension of the second sequence.

5. Synchronisation method according to claim 2, characterised in that the first sequence is generated by means of a first Golay sequence and a first ancillary sequence by successively multiplying the said first Golay sequence by the bits of the first ancillary sequence.

6. Synchronisation method according to claim 5, characterised in that the second sequence is generated by means of a second Golay sequence, complementary to the said first Golay sequence, and a second ancillary sequence by successively multiplying the said second Golay sequence by the bits of the second ancillary sequence.

7. Synchronisation method according to claim 6, characterised in that the first ancillary sequence and the second ancillary sequence are Golay complementary sequences.

8. Synchronisation method according to one of the preceding claims, characterised in that the correlation is effected by a trellis filtering.