Pilot signals for synchronization and/or channel estimation

• US 7,602,841 B2
• Filed: 08/07/2008
• Issued: 10/13/2009
• Est. Priority Date: 03/15/1999
• Status: Expired due to Fees

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Song, Young-Joon
• Primary Examiner(s): Pathak; Sudhanshu C
• Application Number:
  US12/188,025
• Publication Number:
  US 20080298438A1
• Time in Patent Office: 432 Days
• Field of Search: 375/149, 370/335, 370/342, 370/500
• US Class Current: 375/149
• 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 1/708 Parallel implementation
• CPC Class Codes: H04B 1/709 Correlator structure
• CPC Class Codes: H04B 1/7095 Sliding correlator type
• 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 13/10 Code generation

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 or channel estimation in a mobile communication system, the method comprising:

transmitting pilot bit patterns through a physical channel having a radio frame with 15 slots, each slot including pilot bits having a length N_Pilot, where 2≦

N_Pilot≦

16,

wherein pilot bit patterns included in the 15 slots of the radio frame includes at least two of the following pilot bit patterns;

C1=(100011110101100)

C2=(101001101110000),

C3=(110001001101011)

C4=(001010000111011),

C5=(111010110010001)

C6=(110111000010100),

C7=(100110101111000), and

C8=(000011101100101), wherein

at least two of the pilot bit patterns are used by one of a mobile terminal or a communication apparatus for at least one of frame synchronization or channel estimation.

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 arc 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.