PILOT SIGNALS FOR SYNCHRONIZATION AND/OR CHANNEL ESTIMATION

• US 20100067517A1
• Filed: 11/17/2009
• Published: 03/18/2010
• Est. Priority Date: 03/15/1999
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: SONG, Young-Joon
• Granted Patent: US 7,848,393 B2
• Time in Patent Office: Days
• US Class Current: 370/350
• CPC Class Codes: H04B 1/7075 with code phase acquisition
• CPC Class Codes: H04B 1/70755 Setting of lock conditions, e.g. threshold
• CPC Class Codes: H04B 1/709 Correlator structure
• CPC Class Codes: H04B 1/7115 Constructive combining of multi-path signals, i.e. RAKE receivers
• CPC Class Codes: H04B 2201/70701 featuring pilot assisted reception
• CPC Class Codes: H04J 3/06 Synchronising arrangements for television systems H04N5/04; bit-synchronisation H04L7/00
• CPC Class Codes: H04L 7/041 using special codes as synchronising signal

Abstract

The frame words of the embodiments are suitable for frame synchronization and/or channel estimation. By adding the autocorrelation and/or cross-correlation functions of frame words, double maximum values equal in magnitude and opposite polarity at zero and middle shifts are obtained. This property can be used to slot-by-slot, double-check frame synchronization timing, single frame synchronization and/or channel estimation and allows reduction of the synchronization search time. Further, the present invention allows a simpler construction of a correlator circuit for a receiver. A frame synchronization apparatus and method using an optimal pilot pattern is used in a wide band code division multiple Access (W-CDMA) next generation mobile communication system.

Claims

1. A method of transmitting pilot bit patterns for at least one of frame synchronization and channel estimation in a mobile communication system, the method comprising:

transmitting at least one pair of pilot bit patterns on a physical channel having a radio frame with 15 slots, each slot including pilot bits having a length of N_pilot, where 2≦

N_Pilot≦

16,

wherein the at least one pair of pilot bit patterns comprises any one of {C₁, C₂}, {C₃, C₄}, {C₅, C₆}, and {C₇, C₈} where

C₁=(100011110101100),

C₂=(101001101110000),

C₃=(110001001101011),

C₄=(001010000111011),

C₅=(111010110010001),

C₆=(110111000010100),

C₇=(100110101111000), and

C₈=(000011101100101).

2. The method of claim 1, wherein, when N_Pilot is equal to 5 or 6, the pilot bit patterns included in the 15 slots of the radio frame are as follows:

3. The method of claim 1, wherein, when N_Pilot is equal to 7 or 8, the pilot bit patterns included in the 15 slots of the radio frame are as follows:

4. The method of claim 2 or 3, wherein the physical channel is an uplink dedicated physical control channel (DPCCH).

5. The method of claim 3, wherein the physical channel carries a random access channel (RACH) when N_Pilot is equal to 8.

6. The method of claim 1, wherein, when N_Pilot is equal to 2, 4, 6 or 8, the pilot bit patterns included in the 15 slots of the radio frame are as follows:

7. The method of claim 6, wherein the physical channel is a downlink dedicated physical control channel (DPCCH).

8. The method of claim 1, wherein, when N_Pilot is equal to 4, 8 or 16, the pilot bit patterns included in the 15 slots of the radio frame are as follows:

9. The method of claim 8, wherein the physical channel uses space time transmit diversity (STTD) encoding.

10. The method of claim 9, wherein the physical channel is a downlink dedicated physical control channel (DPCCH).

11. The method of claim 9, wherein the physical channel is a secondary common control physical channel (S-CCPCH) where N_Pilot is equal to 8 or 16.

12. A communication device adapted for transmitting pilot bit patterns for at least one of frame synchronization and channel estimation in a mobile communication system, the communication device comprising:

means for providing at least one pair of pilot bit patterns; and

means transmitting the at least one pair of pilot bit patterns on a physical channel having a radio frame with 15 slots, each slot including pilot bits having a length of N_Pilot, where 2≦

N_Pilot≦

16,

wherein the at least one pair of pilot bit patterns comprises any one of {C₁, C₂}, {C₃, C₄}, {C₅, C₆}, and {C₇, C₈} where

C₁=(100011110101100),

C₂=(101001101110000),

C₃=(110001001101011),

C₄=(001010000111011),

C₅=(111010110010001),

C₆=(110111000010100),

C₇=(100110101111000), and

C₈=(000011101100101).

13. The communication device of claim 12, wherein, when N_Pilot is equal to 5 or 6, the pilot bit patterns included in the 15 slots of the radio frame are as follows:

14. The communication device of claim 12, wherein, when N_Pilot is equal to 7 or 8, the pilot bit patterns included in the 15 slots of the radio frame are as follows:

15. The communication device of claim 13 or 14, wherein the physical channel is an uplink dedicated physical control channel (DPCCH).

16. The communication device of claim 14, wherein the physical channel carries a random access channel (RACH) when N_Pilot is equal to 8.

17. The communication device of claim 12, wherein, when N_Pilot is equal to 2, 4, 6 or 8, the pilot bit patterns included in the 15 slots of the radio frame are as follows:

18. The communication device of claim 17, wherein the physical channel is a downlink dedicated physical control channel (DPCCH).

19. The communication device of claim 12, wherein, when N_Pilot is equal to 4, 8 or 16, the pilot bit patterns included in the 15 slots of the radio frame are as follows:

20. The communication device of claim 19, wherein the physical channel uses space time transmit diversity (STTD) encoding.

21. The communication device of claim 20, wherein the physical channel is a downlink dedicated physical control channel (DPCCH).

22. The communication device of claim 19, wherein the physical channel is a secondary common control physical channel (S-CCPCH) where N_Pilot is equal to 8 or 16.