Method and apparatus for selection mechanism between OFDM-MIMO and LFDM-SIMO

• US 8,081,698 B2
• Filed: 06/28/2007
• Issued: 12/20/2011
• Est. Priority Date: 06/29/2006
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Xu, Hao, Kim, Byoung-Hoon, Malladi, Durga Prasad
• Primary Examiner(s): Fan, Chieh M
• Assistant Examiner(s): Malek, Leila
• Application Number:
  US11/770,600
• Publication Number:
  US 20080095263A1
• Time in Patent Office: 1,636 Days
• Field of Search: 375/267, 375/295, 370/329, 370/437, 370/465, 370/466, 370/467
• US Class Current: 375/267
• CPC Class Codes: H04B 7/0689 using different transmission schemes, at least one of them being a diversity transmission scheme
• CPC Class Codes: H04L 1/0002 by adapting the transmission rate
• CPC Class Codes: H04L 1/0021 in which the algorithm uses adaptive thresholds
• CPC Class Codes: H04L 1/0025 Transmission of mode-switching indication
• CPC Class Codes: H04L 27/2601 Multicarrier modulation systems
• CPC Class Codes: H04L 27/2614 Peak power aspects
• CPC Class Codes: H04W 52/245 taking into account received signal strength
• CPC Class Codes: H04W 52/367 Power values between minimum and maximum limits, e.g. dynamic range
• CPC Class Codes: H04W 52/42 in systems with time, space, frequency or polarisation diversity

Abstract

Systems and methodologies are described that facilitate switching between various combinations of MIMO, SIMO, SISO and OFDM, LFDM and IFDM. According to various aspects, a method for a wireless communication network is provided that includes: receiving a first set of data information, wherein the first set of information comprising a first value, determining if the first value is above a threshold and transmitting an indication to switch to using a first transmission technique if determined that the first value is above the threshold.

Claims

1. A method for a wireless communication network, comprising:

receiving a first set of data information, wherein the first set of information comprising a first value;

determining if the first value is above a threshold, using a processor;

transmitting an indication to switch to using a first transmission technique if determined that the first value is above the threshold, wherein the first transmission technique comprises an orthogonal frequency division multiplexing-multiple input multiple output (OFDM-MIMO) transmission technique which bypasses a Discrete Fourier Transform (DFT) operation; and

transmitting another indication to use a second transmission technique if determined that the first value is not above the threshold, wherein the second transmission technique comprises a localized frequency division multiplexing-single input multiple output (LFDM-SIMO) transmission technique.

2. The method as claimed in claim 1, wherein, the determining if the first value is above the threshold, comprises determining if signal to noise ratio (SNR) value is above the threshold.

3. The method as claimed in claim 2, further comprising, measuring the SNR value of a terminal.

4. The method as claimed in claim 1, wherein, determining if the first value is above the threshold, comprises determining if a data rate value is above the threshold.

5. The method as claimed in claim 4, further comprising, receiving the first value from a terminal, wherein the first value is the data rate requested by the terminal.

6. The method as claimed in claim 5, further comprising, determining if the terminal requesting the data rate is using the OFDM-MIMO transmission technique prior to the transmitting the indication.

7. The method as claimed in claim 1, wherein, determining if the first value is above the threshold, comprises determining if a power head room (PHR) value is above the threshold.

8. The method as claimed in claim 7, further comprising,

splitting power among transmit antennas if determined that the PHR value is above the threshold;

and

calculating data rate of each stream prior to transmitting the indication.

9. The method as claimed in claim 7, further comprising, receiving a PHR value from a terminal.

10. An apparatus for wireless communication, comprising:

means for receiving a first set of data information, wherein the first set of information comprising a first value;

means for determining if the first value is above a threshold;

means for transmitting an indication to switch to using a first transmission technique if determined that the first value is above the threshold, wherein the first transmission technique comprises an orthogonal frequency division multiplexing-multiple input multiple output (OFDM-MIMO) transmission technique which bypasses a Discrete Fourier Transform (DFT) operation; and

means for transmitting another indication to use a second transmission technique if determined that the first value is not above the threshold, wherein the second transmission technique comprises a localized frequency division multiplexing-single input multiple output (LFDM-SIMO) transmission technique.

11. The apparatus as claimed in claim 10, wherein, the means for determining if the first value is above the threshold, comprises means for determining if signal to noise ratio (SNR) value is above the threshold.

12. The apparatus as claimed in claim 11, further comprising, means for measuring the SNR value of a terminal.

13. The apparatus as claimed in claim 10, wherein, means for determining if the first value is above the threshold, comprises means for determining if a data rate value is above the threshold.

14. The apparatus as claimed in claim 13, further comprising, means for receiving the first value from a terminal, wherein the first value is the data rate requested by the terminal.

15. The apparatus as claimed in claim 14, further comprising, means for determining if the terminal requesting the data rate is using the OFDM-MIMO transmission technique prior to the transmitting the indication.

16. The apparatus as claimed in claim 10, wherein, means for determining if the first value is above the threshold, comprises means for determining if a power head room (PHR) value is above the threshold.

17. The apparatus as claimed in claim 16, further comprising,

means for splitting power among transmit antennas if determined that the PHR value is above the threshold;

and

means for calculating data rate of each stream prior to transmitting the indication.

18. The apparatus as claimed in claim 16, further comprising, means for receiving a PHR value from a terminal.

19. A non-transitory computer readable medium having stored thereon computer executable instructions for performing the following instructions:

receiving a first set of data information, wherein the first set of information comprising a first value;

determining if the first value is above a threshold;

transmitting an indication to switch to using a first transmission technique if determined that the first value is above the threshold, wherein the first transmission technique comprises an orthogonal frequency division multiplexing-multiple input multiple output (OFDM-MIMO) transmission technique which bypasses a Discrete Fourier Transform (DFT) operation; and

transmitting another indication to use a second transmission technique if determined that the first value is not above the threshold, wherein the second transmission technique comprises a localized frequency division multiplexing-single input multiple output (LFDM-SIMO) transmission technique.

20. A method for a wireless communication network, comprising:

monitoring a reference signal level;

calculating available power headroom (PHR) value using the reference signal level, by a processor;

transmitting the PHR value;

receiving a first indication to use an orthogonal frequency division multiplexing-multiple input multiple output (OFDM-MIMO) transmission technique if the PHR value is above a threshold and a second indication to use a localized frequency division multiplexing-single input multiple output (LFDM-SIMO) transmission technique if the PHR value is not above the threshold;

responsive to receiving the first indication, switching to the OFDM-MIMO transmission technique by bypassing a Discrete Fourier Transform (DFT) operation; and

responsive to receiving the second indication, transmitting information using the LFDM-SIMO transmission technique.

21. An apparatus for wireless communication, comprising:

means for monitoring a reference signal level;

means for calculating available power headroom (PHR) value using the reference signal level;

means for transmitting the PHR value;

means for receiving a first indication to use an orthogonal frequency division multiplexing-multiple input multiple output (OFDM-MIMO) transmission technique if the PHR value is above a threshold and a second indication to use a localized frequency division multiplexing-single input multiple output (LFDM-SIMO) transmission technique if the PHR value is not above the threshold;

means for, responsive to receiving the first indication, switching to the OFDM-MIMO transmission technique by bypassing a Discrete Fourier Transform (DFT) operation; and

means for, responsive to receiving the second indication, transmitting information using the LFDM-SIMO transmission technique.

22. A non-transitory computer readable medium having stored thereon computer executable instructions for performing the following instructions:

monitoring a reference signal level;

calculating available power headroom (PHR) value using the reference signal level;

transmitting the PHR value;

receiving a first indication to use an orthogonal frequency division multiplexing-multiple input multiple output (OFDM-MIMO) transmission technique if the PHR value is above a threshold and a second indication to use a localized frequency division multiplexing-single input multiple output (LFDM-SIMO) transmission technique if the PHR value is not above the threshold;

responsive to receiving the first indication, switching to the OFDM-MIMO transmission technique by bypassing a Discrete Fourier Transform (DFT) operation; and

responsive to receiving the second indication, transmitting information using the LFDM-SIMO transmission technique.

23. A method for a wireless communication network, comprising:

transmitting a data rate value request;

receiving a first indication to use an orthogonal frequency division multiplexing-multiple input multiple output (OFDM-MIMO) transmission technique if a requested data rate value is above a threshold and a second indication to use a localized frequency division multiplexing-single input multiple output (LFDM-SIMO) transmission technique if the data rate value is not above the threshold;

responsive to receiving the first indication, switching to the OFDM-MIMO transmission technique by bypassing a Discrete Fourier Transform (DFT) operation; and

responsive to receiving the second indication, transmitting information using the LFDM-SIMO transmission technique.

24. An apparatus for wireless communication, comprising:

means for transmitting a data rate value request;

means for receiving a first indication to switch to using an orthogonal frequency division multiplexing-multiple input multiple output (OFDM-MIMO) transmission technique if a requested data rate value is above a threshold and a second indication to use a localized frequency division multiplexing-single input multiple output (LFDM-SIMO) transmission technique if the data rate value is not above the threshold;

means for, responsive to receiving the first indication, switching to the OFDM-MIMO transmission technique by bypassing a Discrete Fourier Transform (DFT) operation; and

means for, responsive to receiving the second indication, transmitting information using the LFDM-SIMO transmission technique.

25. A non-transitory computer readable medium having stored thereon computer executable instructions for performing the following instructions:

transmitting a data rate value request;

receiving a first indication to switch to using an orthogonal frequency division multiplexing-multiple input multiple output (OFDM-MIMO) transmission technique if a data requested rate value is above a threshold and a second indication to use a localized frequency division multiplexing-single input multiple output (LFDM-SIMO) transmission technique if the data rate value is not above the threshold;

responsive to receiving the first indication, switching to the OFDM-MIMO transmission technique by bypassing a Discrete Fourier Transform (DFT) operation; and

responsive to receiving the second indication, transmitting information using the LFDM-SIMO transmission technique.

26. A method for a wireless network, comprising:

calculating signal to noise ratio (SNR) value, using a processor;

transmitting the SNR value;

receiving a first indication to switch to using an orthogonal frequency division multiplexing-multiple input multiple output (OFDM-MIMO) transmission technique if the SNR value is above a threshold and a second indication to use a localized frequency division multiplexing-single input multiple output (LFDM-SIMO) transmission technique if the SNR value is not above the threshold;

responsive to receiving the first indication, switching to the OFDM-MIMO transmission technique by bypassing a Discrete Fourier Transform (DFT) operation; and

responsive to receiving the second indication, transmitting information using the LFDM-SIMO transmission technique.

27. An apparatus for wireless communication, comprising:

means for calculating signal to noise ratio (SNR) value;

means for transmitting the SNR value;

means for receiving a first indication to switch to using an orthogonal frequency division multiplexing-multiple input multiple output (OFDM-MIMO) transmission technique if the SNR value is above a threshold and a second indication to use a localized frequency division multiplexing-single input multiple output (LFDM-SIMO) transmission technique if the SNR value is not above the threshold;

means for, responsive to receiving the first indication, switching to the OFDM-MIMO transmission technique by bypassing a Discrete Fourier Transform (DFT) operation; and

means for, responsive to receiving the second indication, transmitting information using the LFDM-SIMO transmission technique.

28. A non-transitory computer readable medium having stored thereon computer executable instructions for performing the following instructions:

calculating signal to noise ratio (SNR) value;

transmitting the SNR value;

receiving a first indication to switch to using an orthogonal frequency division multiplexing-multiple input multiple output (OFDM-MIMO) transmission technique if the SNR value is above a threshold and a second indication to use a localized frequency division multiplexing-single input multiple output (LFDM-SIMO) transmission technique if the SNR value is not above the threshold;

responsive to receiving the first indication, switching to the OFDM-MIMO transmission technique by bypassing a Discrete Fourier Transform (DFT) operation; and

responsive to receiving the second indication, transmitting information using the LFDM-SIMO transmission technique.

29. An integrated circuit comprising:

at least one processor configured to;

receive a first set of data information, wherein the first set of information comprising a first value;

determine if the first value is above a threshold;

transmit an indication to switch to using a first transmission technique if determined that the first value is above the threshold, wherein the first transmission technique comprises an orthogonal frequency division multiplexing-multiple input multiple output (OFDM-MIMO) transmission technique which bypasses a Discrete Fourier Transform (DFT) operation; and

transmit another indication to use a second transmission technique if determined that the first value is not above the threshold, wherein the second transmission technique comprises a localized frequency division multiplexing-single input multiple output (LFDM-SIMO) transmission technique.

30. The integrated circuit as claimed in claim 29, wherein the at least one processor is configured to determine one of:

if a signal to noise ratio (SNR) value is above the threshold, the SNR value being measured with respect to a terminal;

if a data rate value is above the threshold, the data rate value being requested by a terminal; and

if a power head room (PHR) value is above the threshold, the PHR value being received from a terminal.