Method and system for processing MIMO pilot signals in an orthogonal frequency division multiplexing network

• US 20060245509A1
• Filed: 01/06/2006
• Published: 11/02/2006
• Est. Priority Date: 04/27/2005
• Status: Abandoned Application

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Khan, Farooq, Ding, Yinong, Rensburg, Cornelius van
• Application Number:
  US11/327,755
• Publication Number:
  US 20060245509A1
• Time in Patent Office: Days
• US Class Current: 375/260
• CPC Class Codes: H04B 7/04 using two or more spaced independent antennas
• CPC Class Codes: H04B 7/0684 using different training sequences per antenna
• CPC Class Codes: H04L 27/261 Details of reference signals

Abstract

A method of processing multiple-input/multiple-output pilot signals in an Orthogonal Frequency Division Multiplexing network is provided. The method includes, for each of a plurality of transmit antennas in a transmit antenna array, generating a processed pilot signal using a gain unique to the transmit antenna and transmitting the processed pilot signal.

Claims

1. A method of processing multiple-input/multiple-output (MIMO) pilot signals in an Orthogonal Frequency Division Multiplexing (OFDM) network, comprising, for each of a plurality of transmit antennas in a transmit antenna array:

generating a processed pilot signal using a gain unique to the transmit antenna; and

transmitting the processed pilot signal.

2. The method as set forth in claim 1, further comprising:

generating a pilot signal;

generating a modulated pilot signal based on the pilot signal using a pseudorandom noise (PN) code; and

generating the processed pilot signal comprising generating the processed pilot signal based on the modulated pilot signal.

3. The method as set forth in claim 2, further comprising:

generating a pre-spread pilot signal based on the pilot signal using an orthogonal code; and

generating the modulated pilot signal comprising generating the modulated pilot signal based on the pre-spread pilot signal using a common PN code.

4. The method as set forth in claim 3, the orthogonal code comprising a Walsh code.

5. The method as set forth in claim 2, generating the modulated pilot signal comprising generating the modulated pilot signal using a PN code unique to the transmit antenna.

6. The method as set forth in claim 1, transmitting the processed pilot signal comprising transmitting the processed pilot signal during a first OFDM symbol duration within each of a plurality of Transmission Time Intervals.

7. A transmitter capable of transmitting MIMO pilot signals in an OFDM network, comprising:

a transmit antenna array comprising a plurality of transmit antennas;

a pilot signal generator operable to generate a pilot signal for each of the transmit antennas; and

a multiple gain applier coupled to the transmit antenna array and to the pilot signal generator, the multiple gain applier operable to generate, for each of the transmit antennas, a processed pilot signal based on the pilot signal using a gain unique to the transmit antenna, each of the transmit antennas operable to transmit the processed pilot signal generated for the transmit antenna.

8. The transmitter as set forth in claim 7, further comprising a modulator coupled to the pilot signal generator and to the multiple gain applier, the modulator operable to generate, for each of the transmit antennas, a modulated pilot signal based on the pilot signal using a pseudorandom noise (PN) code, the multiple gain applier operable to generate the processed pilot signal based on the modulated pilot signal.

9. The transmitter as set forth in claim 8, the modulator further operable to generate a pre-spread pilot signal based on the pilot signal using an orthogonal code and to generate the modulated pilot signal based on the pre-spread pilot signal using a common PN code.

10. The transmitter as set forth in claim 9, the orthogonal code comprising a Walsh code.

11. The transmitter as set forth in claim 8, the modulator operable to generate the modulated pilot signal using a PN code unique to the transmit antenna.

12. The transmitter as set forth in claim 7, each of the transmit antennas operable to transmit the processed pilot signal during a first OFDM symbol duration within each of a plurality of Transmission Time Intervals.

13. A method of processing MIMO pilot signals in an OFDM network, comprising, for each of a plurality of stages at each of a plurality of receive antennas:

receiving an input signal;

generating a channel estimate based on the input signal;

generating a reconstructed signal based on the channel estimate; and

canceling the reconstructed signal from the input signal to generate a canceled signal, the input signal for a first stage comprising a combination of processed pilot signals transmitted from a plurality of transmit antennas, each processed pilot signal transmitted at a different gain.

14. The method as set forth in claim 13, the input signal for each subsequent stage comprising the canceled signal generated in an immediately previous stage.

15. The method as set forth in claim 13, further comprising:

demodulating the input signal using a pseudorandom noise (PN) code to generate an estimation signal; and

generating the channel estimate comprising generating the channel estimate based on the estimation signal.

16. The method as set forth in claim 15, the PN code associated with the stage.

17. The method as set forth in claim 15, the PN code comprising a common PN code.

18. The method as set forth in claim 13, generating the reconstructed signal comprising generating the reconstructed signal using a pilot signal associated with the stage, a PN code associated with the stage, and a gain associated with the stage.

19. The method as set forth in claim 13, generating the reconstructed signal comprising generating the reconstructed signal using a pilot signal associated with the stage, a common PN code, an orthogonal code associated with the stage, and a gain associated with the stage.

20. The method as set forth in claim 19, the orthogonal code comprising a Walsh code.