Pilot signals for synchronization and/or channel estimation

• US 7,616,681 B2
• Filed: 03/05/2009
• Issued: 11/10/2009
• 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:
  US12/398,344
• Publication Number:
  US 20090196271A1
• Time in Patent Office: 250 Days
• Field of Search: 375/149, 370/335, 370/342, 370/500
• US Class Current: 375/149
• CPC Class Codes: H04B 1/707 using direct sequence modulation
• 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 1/7095 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: 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: H04J 13/18 Allocation of orthogonal codes
• CPC Class Codes: H04L 25/0224 using sounding signals
• CPC Class Codes: H04L 25/0226 sounding signals per se

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 communication device adapted for transmitting pilot bit patterns in a mobile communication environment, the communication device comprising:

means for providing pilot bit patterns;

means for 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).

2. The communication device 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 communication device 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 communication device of claim 2 or 3, wherein said physical channel is an uplink dedicated physical control channel (DPCCH).

5. The communication device of claim 3, wherein said physical channel carries a random access channel (RACH) when N_pilot is equal to 8.

6. The communication device 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 communication device 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:

8. The communication device of claim 7, wherein the physical channel uses space time transmit diversity (STTD) encoding.

9. The communication device of any one of claims 6 to 8, wherein the physical channel is a downlink dedicated physical control channel (DPCCH).

10. The communication device of claim 7, wherein the physical channel is a secondary common control physical channel (S-CCPCH) where N_pilot is equal to 8 or 16.