PILOT SIGNAL TRANSMISSION FOR AN ORTHOGONAL FREQUENCY DIVISION WIRELESS COMMUNICATION SYSTEM

• US 20090213950A1
• Filed: 11/24/2008
• Published: 08/27/2009
• Est. Priority Date: 03/17/2005
• Status: Abandoned Application

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Gore, Dhananjay Ashok, Naguib, Ayman Fawzy, Gorokhov, Alexei, Sutivong, Arak, Ji, Tingfang
• Application Number:
  US12/276,649
• Publication Number:
  US 20090213950A1
• Time in Patent Office: Days
• US Class Current: 375/260
• CPC Class Codes: H04B 1/715 Interference-related aspects
• CPC Class Codes: H04B 2001/7154 with means for preventing interference
• CPC Class Codes: H04B 7/0697 using spatial multiplexing
• CPC Class Codes: H04B 7/12 Frequency diversity
• CPC Class Codes: H04L 25/0204 of multiple channels
• CPC Class Codes: H04L 25/0216 with estimation of channel length
• CPC Class Codes: H04L 25/0226 sounding signals per se
• CPC Class Codes: H04L 25/0228 with direct estimation from sounding signals
• CPC Class Codes: H04L 25/03866 using scrambling
• CPC Class Codes: H04L 5/0012 Hopping in multicarrier systems for frequency hopping in spread spectrum systems H04B1/713
• CPC Class Codes: H04L 5/0026 Division using four or more dimensions
• CPC Class Codes: H04L 5/0037 Inter-user or inter-terminal allocation
• CPC Class Codes: H04L 5/0051 of dedicated pilots, i.e. pilots destined for a single user or terminal
• CPC Class Codes: H04L 5/0058 Allocation criteria

Abstract

Transmission patterns for pilot symbols transmitted from a mobile station or base station are provided. The pattern allows for improved receipt of the pilot symbols transmitted. In addition, schemes for improving the ability to multiplex pilot symbols without interference and/or biasing from different mobile stations over the same frequencies and in the same time slots.

Claims

1. A method for estimating a channel, the method comprising:

receiving a plurality of tiles, each of the plurality of tiles having a plurality of data symbols and a plurality of pilot symbols; and

estimating the channel based on the plurality of pilot signals in the plurality of tiles.

3. The method of claim 1, wherein said first group of data symbols is for a specific terminal.

4. The method of claim 1, wherein said first group of data symbols is for a plurality of terminals.

5. The method of claim 1, further comprising:

providing N hop regions, said N hop regions including said first hop region, N being a positive integer; and

transmitting a second group of data symbols and a second group of pilot symbols, said second group of data symbols and said second group of pilot symbols being located in one of said N hop regions.

6. The method of claim 4, wherein said N hop regions does not span an entire system bandwidth.

7. The method of claim 4, wherein said N hop regions span an entire system bandwidth.

8. The method of claim 6, further comprising transmitting pilot symbols in M hop regions, M being a positive integer not greater than said N.

2. A method of wireless communication, comprising:

transmitting a first group of data symbols; and

transmitting a first group of pilot symbols,

wherein said first group of data symbols and said first group of pilot symbols are located in a first hop region.

9. An apparatus for wireless communication, comprising a transmitter operable to transmit a first group of data symbols and a first group of pilot symbols, wherein said first group of data symbols and said first group of pilot symbols are located in a first hop region.

10. The apparatus of claim 9 wherein said transmitter is operable to hop over N hop regions including said first hop region, N being a positive integer;

and transmit a second group of data symbols and a second group of pilot symbols, said second group of data symbols and said second group of pilot symbols being located in one of said N hop regions.

11. A method of wireless communication, comprising:

receiving a first group of data symbols and a first group of pilot symbols, said first group of data symbols and said first group of pilot symbols being located in a first hop region; and

performing channel estimation based on said first group of pilot symbols.

12. The method of claim 11, wherein at least part of said first group of data symbols is for a terminal, and said channel estimation is performed for said terminal.

13. The method of claim 11, further comprising:

receiving a second group of data symbols and a second group of pilot symbols, said second group of data symbols and said second group of pilot symbols being located in a second hop region; and

performing channel estimation based on said first group of pilot symbols and said second group of pilot symbols.

14. The method of claim 13, wherein at least part of said first group of data symbols is for a terminal, at least part of said second group of data symbols is for said terminal, and said channel estimation is performed for said terminal.

15. An apparatus for wireless communication, comprising:

means for transmitting a first group of data symbols; and

means for transmitting a first group of pilot symbols,

wherein said first group of data symbols and said first group of pilot symbols are located in a first hop region.

16. The apparatus of claim 15, further comprising:

means for providing N hop regions, said N hop regions including said first hop region, N being a positive integer; and

means for transmitting a second group of data symbols and a second group of pilot symbols, said second group of data symbols and said second group of pilot symbols being located in one of said N hop regions.

17. A computer-readable medium comprising:

code for generating a first group of data symbols; and

code for transmitting a first group of pilot symbols,

wherein said first group of data symbols and said first group of pilot symbols are located in a first hop region.

18. The computer-readable medium of claim 17, further comprising:

code for hopping over N hop regions, said N hop regions including said first hop region, N being a positive integer; and

code for transmitting a second group of data symbols and a second group of pilot symbols, said second group of data symbols and said second group of pilot symbols being located in one of said N hop regions.