SYSTEMS AND METHODS FOR WIRELESS COMMUNICATION

• US 20140078920A1
• Filed: 09/11/2013
• Published: 03/20/2014
• Est. Priority Date: 09/14/2012
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: SAMPATH, Hemanth, TANDRA, Rahul, BARRIAC, Gwendolyn Denise, VERMANI, Sameer
• Granted Patent: US 9,253,291 B2
• Time in Patent Office: Days
• US Class Current: 370/252
• CPC Class Codes: H04L 25/022 of frequency response
• CPC Class Codes: H04L 25/03159 operating in the frequency domain H04L25/03165, H04L25/03178 take precedence
• CPC Class Codes: H04L 25/03891 Spatial equalizers MIMO diversity systems H04B7/0413
• CPC Class Codes: H04L 27/2607 Cyclic extensions
• CPC Class Codes: H04L 27/265 Fourier transform demodulators, e.g. fast Fourier transform [FFT] or discrete Fourier transform [DFT] demodulators H04L27/26524 takes precedence
• CPC Class Codes: H04L 69/08 Protocols for interworking; Protocol conversion

Abstract

Systems, methods, and devices for wireless communication. In one aspect, an apparatus for wireless communication is provided. The apparatus includes a receiver configured to receive a wireless signal comprising a packet. At least a portion of the wireless signal may be received over a channel with a channel bandwidth of at least approximately five hundred megahertz. The packet may be formed from at least one orthogonal frequency-division multiplexing (OFDM) symbol comprising at least one hundred and twenty-eight tones. The apparatus further comprises a processor configured to evaluate the wireless signal. The processor may comprise a transform module configured to convert the at least one OFDM symbol into a frequency domain signal.

Claims

1. An apparatus for wireless communication, comprising:

a receiver configured to receive a wireless signal comprising a packet, at least a portion of the wireless signal being received over a channel with a channel bandwidth of at least approximately five hundred megahertz, wherein the packet is formed from at least one orthogonal frequency-division multiplexing (OFDM) symbol comprising at least one hundred and twenty-eight tones, wherein the packet further includes a cyclic prefix, wherein a duration of the cyclic prefix is a function of the channel bandwidth and is set such that the duration of the cyclic prefix is greater than a delay spread of the channel and delay introduced by front-end processing; and

a processor configured to evaluate the wireless signal, the processor comprising a transform module configured to convert the at least one OFDM symbol into a frequency domain signal.

2. The apparatus of claim 1, wherein the channel bandwidth is approximately five hundred megahertz, wherein the at least one hundred and twenty-eight tones correspond to frequency subcarriers within the channel bandwidth, wherein the cyclic prefix comprises at least thirty-two tones and a duration of sixty-four nanoseconds when the at least one OFDM symbol comprises at least one hundred and twenty-eight tones, wherein the cyclic prefix comprises at least sixty-four tones and a duration of one hundred and twenty-eight nanoseconds when the at least one OFDM symbol comprises at least two hundred and fifty-six tones, and wherein the cyclic prefix comprises at least sixty-four tones and a duration of one hundred and twenty-eight nanoseconds when the at least one OFDM symbol comprises five hundred and twelve tones.

3. The apparatus of claim 1, wherein the channel bandwidth is approximately one thousand megahertz, wherein the at least one hundred and twenty-eight tones correspond to frequency subcarriers within the channel bandwidth, wherein the cyclic prefix comprises at most sixty-four tones and a duration between forty-eight nanoseconds and fifty-six nanoseconds when the at least one OFDM symbol comprises at least two hundred and fifty-six tones, wherein the cyclic prefix comprises at most one hundred and twenty-eight tones and a duration between one hundred and twelve nanoseconds and one hundred and twenty nanoseconds when the at least one OFDM symbol comprises at least five hundred and twelve tones, and wherein the cyclic prefix comprises at most one hundred and twenty-eight tones and a duration between one hundred and twelve nanoseconds and one hundred and twenty nanoseconds when the at least one OFDM symbol comprises at least one thousand and twenty-four tones.

4. The apparatus of claim 1, wherein the channel bandwidth is approximately two thousand megahertz, wherein the at least one hundred and twenty-eight tones correspond to frequency subcarriers within the channel bandwidth, wherein the cyclic prefix comprises at most one hundred and twenty-eight tones and a duration between thirty nanoseconds and sixty-four nanoseconds when the at least one OFDM symbol comprises at least five hundred and twelve tones, wherein the cyclic prefix comprises at most two hundred and fifty-six tones and a duration between one hundred and four nanoseconds and one hundred and sixteen nanoseconds when the at least one OFDM symbol comprises at least one thousand and twenty-four tones, and wherein the cyclic prefix comprises at most two hundred and fifty-six tones and a duration between one hundred and four nanoseconds and one hundred and sixteen nanoseconds when the at least one OFDM symbol comprises at least two thousand and forty-eight tones.

5. A method for wireless communication, comprising:

receiving a wireless signal comprising a packet, at least a portion of the wireless signal being received over a channel with a channel bandwidth of at least approximately five hundred megahertz, wherein the packet is formed from at least one orthogonal frequency-division multiplexing (OFDM) symbol comprising at least one hundred and twenty-eight tones, wherein the packet further includes a cyclic prefix, wherein a duration of the cyclic prefix is a function of the channel bandwidth and is set such that the duration of the cyclic prefix is greater than a delay spread of the channel and delay introduced by front-end processing; and

evaluating the wireless signal, the evaluating comprising converting the at least one OFDM symbol into a frequency domain signal.

6. The method of claim 5, wherein the channel bandwidth is approximately five hundred megahertz, wherein the at least one hundred and twenty-eight tones correspond to frequency subcarriers within the channel bandwidth, wherein the cyclic prefix comprises at least thirty-two tones and a duration of sixty-four nanoseconds when the at least one OFDM symbol comprises at least one hundred and twenty-eight tones, wherein the cyclic prefix comprises at least sixty-four tones and a duration of one hundred and twenty-eight nanoseconds when the at least one OFDM symbol comprises at least two hundred and fifty-six tones, and wherein the cyclic prefix comprises at least sixty-four tones and a duration of one hundred and twenty-eight nanoseconds when the at least one OFDM symbol comprises five hundred and twelve tones.

7. The method of claim 5, wherein the channel bandwidth is approximately one thousand megahertz, wherein the at least one hundred and twenty-eight tones correspond to frequency subcarriers within the channel bandwidth, wherein the cyclic prefix comprises at most sixty-four tones and a duration between forty-eight nanoseconds and fifty-six nanoseconds when the at least one OFDM symbol comprises at least two hundred and fifty-six tones, wherein the cyclic prefix comprises at most one hundred and twenty-eight tones and a duration between one hundred and twelve nanoseconds and one hundred and twenty nanoseconds when the at least one OFDM symbol comprises at least five hundred and twelve tones, and wherein the cyclic prefix comprises at most one hundred and twenty-eight tones and a duration between one hundred and twelve nanoseconds and one hundred and twenty nanoseconds when the at least one OFDM symbol comprises at least one thousand and twenty-four tones.

8. The method of claim 5, wherein the channel bandwidth is approximately two thousand megahertz, wherein the at least one hundred and twenty-eight tones correspond to frequency subcarriers within the channel bandwidth, wherein the cyclic prefix comprises at most one hundred and twenty-eight tones and a duration between thirty nanoseconds and sixty-four nanoseconds when the at least one OFDM symbol comprises at least five hundred and twelve tones, wherein the cyclic prefix comprises at most two hundred and fifty-six tones and a duration between one hundred and four nanoseconds and one hundred and sixteen nanoseconds when the at least one OFDM symbol comprises at least one thousand and twenty-four tones, and wherein the cyclic prefix comprises at most two hundred and fifty-six tones and a duration between one hundred and four nanoseconds and one hundred and sixteen nanoseconds when the at least one OFDM symbol comprises at least two thousand and forty-eight tones.

9. An apparatus for wireless communication, comprising:

means for receiving a wireless signal comprising a packet, at least a portion of the wireless signal being received over a channel with a channel bandwidth of at least approximately five hundred megahertz, wherein the packet is formed from at least one orthogonal frequency-division multiplexing (OFDM) symbol comprising at least one hundred and twenty-eight tones, wherein the packet further includes a cyclic prefix, wherein a duration of the cyclic prefix is a function of the channel bandwidth and is set such that the duration of the cyclic prefix is greater than a delay spread of the channel and delay introduced by front-end processing; and

means for evaluating the wireless signal, wherein the means for evaluating the wireless signal comprises means for converting the at least one OFDM symbol into a frequency domain signal.

10. The apparatus of claim 9, wherein the channel bandwidth is approximately five hundred megahertz, wherein the at least one hundred and twenty-eight tones correspond to frequency subcarriers within the channel bandwidth, wherein the cyclic prefix comprises at least thirty-two tones and a duration of sixty-four nanoseconds when the at least one OFDM symbol comprises at least one hundred and twenty-eight tones, wherein the cyclic prefix comprises at least sixty-four tones and a duration of one hundred and twenty-eight nanoseconds when the at least one OFDM symbol comprises at least two hundred and fifty-six tones, and wherein the cyclic prefix comprises at least sixty-four tones and a duration of one hundred and twenty-eight nanoseconds when the at least one OFDM symbol comprises five hundred and twelve tones.

11. The apparatus of claim 9, wherein the channel bandwidth is approximately one thousand megahertz, wherein the at least one hundred and twenty-eight tones correspond to frequency subcarriers within the channel bandwidth, wherein the cyclic prefix comprises at most sixty-four tones and a duration between forty-eight nanoseconds and fifty-six nanoseconds when the at least one OFDM symbol comprises at least two hundred and fifty-six tones, wherein the cyclic prefix comprises at most one hundred and twenty-eight tones and a duration between one hundred and twelve nanoseconds and one hundred and twenty nanoseconds when the at least one OFDM symbol comprises at least five hundred and twelve tones, and wherein the cyclic prefix comprises at most one hundred and twenty-eight tones and a duration between one hundred and twelve nanoseconds and one hundred and twenty nanoseconds when the at least one OFDM symbol comprises at least one thousand and twenty-four tones.

12. The apparatus of claim 9, wherein the channel bandwidth is approximately two thousand megahertz, wherein the at least one hundred and twenty-eight tones correspond to frequency subcarriers within the channel bandwidth, wherein the cyclic prefix comprises at most one hundred and twenty-eight tones and a duration between thirty nanoseconds and sixty-four nanoseconds when the at least one OFDM symbol comprises at least five hundred and twelve tones, wherein the cyclic prefix comprises at most two hundred and fifty-six tones and a duration between one hundred and four nanoseconds and one hundred and sixteen nanoseconds when the at least one OFDM symbol comprises at least one thousand and twenty-four tones, and wherein the cyclic prefix comprises at most two hundred and fifty-six tones and a duration between one hundred and four nanoseconds and one hundred and sixteen nanoseconds when the at least one OFDM symbol comprises at least two thousand and forty-eight tones.

13. The apparatus of claim 9, wherein the means for receiving comprises a receiver and the means for evaluating comprises a processor.

14. A non-transitory computer-readable medium comprising code that, when executed, causes an apparatus to:

receive a wireless signal comprising a packet, at least a portion of the wireless signal being received over a channel with a channel bandwidth of at least approximately five hundred megahertz, wherein the packet is formed from at least one orthogonal frequency-division multiplexing (OFDM) symbol comprising at least one hundred and twenty-eight tones, wherein the packet further includes a cyclic prefix, wherein a duration of the cyclic prefix is a function of the channel bandwidth and is set such that the duration of the cyclic prefix is greater than a delay spread of the channel and delay introduced by front-end processing; and

convert the at least one OFDM symbol into a frequency domain signal.

15. The medium of claim 14, wherein the channel bandwidth is approximately five hundred megahertz, wherein the at least one hundred and twenty-eight tones correspond to frequency subcarriers within the channel bandwidth, wherein the cyclic prefix comprises at least thirty-two tones and a duration of sixty-four nanoseconds when the at least one OFDM symbol comprises at least one hundred and twenty-eight tones, wherein the cyclic prefix comprises at least sixty-four tones and a duration of one hundred and twenty-eight nanoseconds when the at least one OFDM symbol comprises at least two hundred and fifty-six tones, and wherein the cyclic prefix comprises at least sixty-four tones and a duration of one hundred and twenty-eight nanoseconds when the at least one OFDM symbol comprises five hundred and twelve tones.

16. The medium of claim 14, wherein the channel bandwidth is approximately one thousand megahertz, wherein the at least one hundred and twenty-eight tones correspond to frequency subcarriers within the channel bandwidth, wherein the cyclic prefix comprises at most sixty-four tones and a duration between forty-eight nanoseconds and fifty-six nanoseconds when the at least one OFDM symbol comprises at least two hundred and fifty-six tones, wherein the cyclic prefix comprises at most one hundred and twenty-eight tones and a duration between one hundred and twelve nanoseconds and one hundred and twenty nanoseconds when the at least one OFDM symbol comprises at least five hundred and twelve tones, and wherein the cyclic prefix comprises at most one hundred and twenty-eight tones and a duration between one hundred and twelve nanoseconds and one hundred and twenty nanoseconds when the at least one OFDM symbol comprises at least one thousand and twenty-four tones.

17. The medium of claim 14, wherein the channel bandwidth is approximately two thousand megahertz, wherein the at least one hundred and twenty-eight tones correspond to frequency subcarriers within the channel bandwidth, wherein the cyclic prefix comprises at most one hundred and twenty-eight tones and a duration between thirty nanoseconds and sixty-four nanoseconds when the at least one OFDM symbol comprises at least five hundred and twelve tones, wherein the cyclic prefix comprises at most two hundred and fifty-six tones and a duration between one hundred and four nanoseconds and one hundred and sixteen nanoseconds when the at least one OFDM symbol comprises at least one thousand and twenty-four tones, and wherein the cyclic prefix comprises at most two hundred and fifty-six tones and a duration between one hundred and four nanoseconds and one hundred and sixteen nanoseconds when the at least one OFDM symbol comprises at least two thousand and forty-eight tones.

18. An apparatus for wireless communication, comprising:

a processor configured to generate a packet for transmission via a wireless signal, wherein the packet is generated for transmission using at least one orthogonal frequency-division multiplexing (OFDM) symbol comprising at least one hundred and twenty-eight tones; and

a transmitter configured to transmit the packet via the wireless signal over a channel with a channel bandwidth of at least approximately five hundred megahertz, wherein the packet further includes a cyclic prefix, wherein a duration of the cyclic prefix is a function of the channel bandwidth and is set such that the duration of the cyclic prefix is greater than a delay spread of the channel and delay introduced by front-end processing.

19. The apparatus of claim 18, further comprising a transform module configured to convert the at least one OFDM symbol into a time domain signal using a one hundred and twenty-eight point mode, wherein the channel bandwidth is approximately five hundred megahertz, wherein the at least one hundred and twenty-eight tones correspond to frequency subcarriers within the channel bandwidth, wherein the cyclic prefix comprises at least thirty-two tones and a duration of sixty-four nanoseconds when the at least one OFDM symbol comprises at least one hundred and twenty-eight tones, wherein the cyclic prefix comprises at least sixty-four tones and a duration of one hundred and twenty-eight nanoseconds when the at least one OFDM symbol comprises at least two hundred and fifty-six tones, and wherein the cyclic prefix comprises at least sixty-four tones and a duration of one hundred and twenty-eight nanoseconds when the at least one OFDM symbol comprises five hundred and twelve tones.

20. The apparatus of claim 18, further comprising a transform module configured to convert the at least one OFDM symbol into a time domain signal using a two hundred and fifty-six point mode, wherein the channel bandwidth is approximately one thousand megahertz, wherein the at least one hundred and twenty-eight tones correspond to frequency subcarriers within the channel bandwidth, wherein the cyclic prefix comprises at most sixty-four tones and a duration between forty-eight nanoseconds and fifty-six nanoseconds when the at least one OFDM symbol comprises at least two hundred and fifty-six tones, wherein the cyclic prefix comprises at most one hundred and twenty-eight tones and a duration between one hundred and twelve nanoseconds and one hundred and twenty nanoseconds when the at least one OFDM symbol comprises at least five hundred and twelve tones, and wherein the cyclic prefix comprises at most one hundred and twenty-eight tones and a duration between one hundred and twelve nanoseconds and one hundred and twenty nanoseconds when the at least one OFDM symbol comprises at least one thousand and twenty-four tones.

21. The apparatus of claim 18, further comprising a transform module configured to convert the at least one OFDM symbol into a time domain signal using a five hundred and twelve point mode, wherein the channel bandwidth is approximately two thousand megahertz, wherein the at least one hundred and twenty-eight tones correspond to frequency subcarriers within the channel bandwidth, wherein the cyclic prefix comprises at most one hundred and twenty-eight tones and a duration between thirty nanoseconds and sixty-four nanoseconds when the at least one OFDM symbol comprises at least five hundred and twelve tones, wherein the cyclic prefix comprises at most two hundred and fifty-six tones and a duration between one hundred and four nanoseconds and one hundred and sixteen nanoseconds when the at least one OFDM symbol comprises at least one thousand and twenty-four tones, and wherein the cyclic prefix comprises at most two hundred and fifty-six tones and a duration between one hundred and four nanoseconds and one hundred and sixteen nanoseconds when the at least one OFDM symbol comprises at least two thousand and forty-eight tones.

22. A method for wireless communication, comprising:

generating a packet for transmission via a wireless signal, wherein generating the packet comprises generating the packet for transmission using at least one orthogonal frequency-division multiplexing (OFDM) symbol comprising at least one hundred and twenty-eight tones; and

transmitting the packet via the wireless signal over a channel with a channel bandwidth of at least approximately five hundred megahertz, wherein the packet further includes a cyclic prefix, wherein a duration of the cyclic prefix is a function of the channel bandwidth and is set such that the duration of the cyclic prefix is greater than a delay spread of the channel and delay introduced by front-end processing.

23. The method of claim 22, further comprising converting the at least one OFDM symbol into a time domain signal using a one hundred and twenty-eight point mode, wherein the channel bandwidth is approximately five hundred megahertz, wherein the at least one hundred and twenty-eight tones correspond to frequency subcarriers within the channel bandwidth, wherein the cyclic prefix comprises at least thirty-two tones and a duration of sixty-four nanoseconds when the at least one OFDM symbol comprises at least one hundred and twenty-eight tones, wherein the cyclic prefix comprises at least sixty-four tones and a duration of one hundred and twenty-eight nanoseconds when the at least one OFDM symbol comprises at least two hundred and fifty-six tones, and wherein the cyclic prefix comprises at least sixty-four tones and a duration of one hundred and twenty-eight nanoseconds when the at least one OFDM symbol comprises five hundred and twelve tones.

24. The method of claim 22, further comprising converting the at least one OFDM symbol into a time domain signal using a two hundred and fifty-six point mode, wherein the channel bandwidth is approximately one thousand megahertz, wherein the at least one hundred and twenty-eight tones correspond to frequency subcarriers within the channel bandwidth, wherein the cyclic prefix comprises at most sixty-four tones and a duration between forty-eight nanoseconds and fifty-six nanoseconds when the at least one OFDM symbol comprises at least two hundred and fifty-six tones, wherein the cyclic prefix comprises at most one hundred and twenty-eight tones and a duration between one hundred and twelve nanoseconds and one hundred and twenty nanoseconds when the at least one OFDM symbol comprises at least five hundred and twelve tones, and wherein the cyclic prefix comprises at most one hundred and twenty-eight tones and a duration between one hundred and twelve nanoseconds and one hundred and twenty nanoseconds when the at least one OFDM symbol comprises at least one thousand and twenty-four tones.

25. The method of claim 22, further comprising converting the at least one OFDM symbol into a time domain signal using a five hundred and twelve point mode, wherein the channel bandwidth is approximately two thousand megahertz, wherein the at least one hundred and twenty-eight tones correspond to frequency subcarriers within the channel bandwidth, wherein the cyclic prefix comprises at most one hundred and twenty-eight tones and a duration between thirty nanoseconds and sixty-four nanoseconds when the at least one OFDM symbol comprises at least five hundred and twelve tones, wherein the cyclic prefix comprises at most two hundred and fifty-six tones and a duration between one hundred and four nanoseconds and one hundred and sixteen nanoseconds when the at least one OFDM symbol comprises at least one thousand and twenty-four tones, and wherein the cyclic prefix comprises at most two hundred and fifty-six tones and a duration between one hundred and four nanoseconds and one hundred and sixteen nanoseconds when the at least one OFDM symbol comprises at least two thousand and forty-eight tones.

26. An apparatus for wireless communication, comprising:

means for generating a packet for transmission via a wireless signal, wherein the means for generating the packet comprises means for generating the packet for transmission using at least one orthogonal frequency-division multiplexing (OFDM) symbol comprising at least one hundred and twenty-eight tones; and

means for transmitting the packet via the wireless signal over a channel with a channel bandwidth of at least approximately five hundred megahertz, wherein the packet further includes a cyclic prefix, wherein a duration of the cyclic prefix is a function of the channel bandwidth and is set such that the duration of the cyclic prefix is greater than a delay spread of the channel and delay introduced by front-end processing.

27. The apparatus of claim 26, further comprising means for converting the at least one OFDM symbol into a time domain signal using a one hundred and twenty-eight point mode, wherein the channel bandwidth is approximately five hundred megahertz, wherein the at least one hundred and twenty-eight tones correspond to frequency subcarriers within the channel bandwidth, wherein the cyclic prefix comprises at least thirty-two tones and a duration of sixty-four nanoseconds when the at least one OFDM symbol comprises at least one hundred and twenty-eight tones, wherein the cyclic prefix comprises at least sixty-four tones and a duration of one hundred and twenty-eight nanoseconds when the at least one OFDM symbol comprises at least two hundred and fifty-six tones, and wherein the cyclic prefix comprises at least sixty-four tones and a duration of one hundred and twenty-eight nanoseconds when the at least one OFDM symbol comprises five hundred and twelve tones.

28. The apparatus of claim 26, further comprising means for converting the at least one OFDM symbol into a time domain signal using a two hundred and fifty-six point mode, wherein the channel bandwidth is approximately one thousand megahertz, wherein the at least one hundred and twenty-eight tones correspond to frequency subcarriers within the channel bandwidth, wherein the cyclic prefix comprises at most sixty-four tones and a duration between forty-eight nanoseconds and fifty-six nanoseconds when the at least one OFDM symbol comprises at least two hundred and fifty-six tones, wherein the cyclic prefix comprises at most one hundred and twenty-eight tones and a duration between one hundred and twelve nanoseconds and one hundred and twenty nanoseconds when the at least one OFDM symbol comprises at least five hundred and twelve tones, and wherein the cyclic prefix comprises at most one hundred and twenty-eight tones and a duration between one hundred and twelve nanoseconds and one hundred and twenty nanoseconds when the at least one OFDM symbol comprises at least one thousand and twenty-four tones.

29. The apparatus of claim 26, further comprising means for converting the at least one OFDM symbol into a time domain signal using a five hundred and twelve point mode, wherein the channel bandwidth is approximately two thousand megahertz, wherein the at least one hundred and twenty-eight tones correspond to frequency subcarriers within the channel bandwidth, wherein the cyclic prefix comprises at most one hundred and twenty-eight tones and a duration between thirty nanoseconds and sixty-four nanoseconds when the at least one OFDM symbol comprises at least five hundred and twelve tones, wherein the cyclic prefix comprises at most two hundred and fifty-six tones and a duration between one hundred and four nanoseconds and one hundred and sixteen nanoseconds when the at least one OFDM symbol comprises at least one thousand and twenty-four tones, and wherein the cyclic prefix comprises at most two hundred and fifty-six tones and a duration between one hundred and four nanoseconds and one hundred and sixteen nanoseconds when the at least one OFDM symbol comprises at least two thousand and forty-eight tones.

30. The apparatus of claim 26, wherein the means for generating comprises a processor, and wherein the means for transmitting comprises a transmitter.

31. A non-transitory computer-readable medium comprising code that, when executed, causes an apparatus to:

generate a packet for transmission via a wireless signal, wherein the packet is generated for transmission using at least one orthogonal frequency-division multiplexing (OFDM) symbol comprising at least one hundred and twenty-eight tones; and

transmit the packet via the wireless signal over a channel with a channel bandwidth of at least approximately five hundred megahertz, wherein the packet further includes a cyclic prefix, wherein a duration of the cyclic prefix is a function of the channel bandwidth and is set such that the duration of the cyclic prefix is greater than a delay spread of the channel and delay introduced by front-end processing.

32. The medium of claim 31, further comprising code that, when executed, causes an apparatus to convert the at least one OFDM symbol into a time domain signal using a one hundred and twenty-eight point mode, wherein the channel bandwidth is approximately five hundred megahertz, wherein the at least one hundred and twenty-eight tones correspond to frequency subcarriers within the channel bandwidth, wherein the cyclic prefix comprises at least thirty-two tones and a duration of sixty-four nanoseconds when the at least one OFDM symbol comprises at least one hundred and twenty-eight tones, wherein the cyclic prefix comprises at least sixty-four tones and a duration of one hundred and twenty-eight nanoseconds when the at least one OFDM symbol comprises at least two hundred and fifty-six tones, and wherein the cyclic prefix comprises at least sixty-four tones and a duration of one hundred and twenty-eight nanoseconds when the at least one OFDM symbol comprises five hundred and twelve tones.

33. The medium of claim 31, further comprising code that, when executed, causes an apparatus to convert the at least one OFDM symbol into a time domain signal using a two hundred and fifty-six point mode, wherein the channel bandwidth is approximately one thousand megahertz, wherein the at least one hundred and twenty-eight tones correspond to frequency subcarriers within the channel bandwidth, wherein the cyclic prefix comprises at most sixty-four tones and a duration between forty-eight nanoseconds and fifty-six nanoseconds when the at least one OFDM symbol comprises at least two hundred and fifty-six tones, wherein the cyclic prefix comprises at most one hundred and twenty-eight tones and a duration between one hundred and twelve nanoseconds and one hundred and twenty nanoseconds when the at least one OFDM symbol comprises at least five hundred and twelve tones, and wherein the cyclic prefix comprises at most one hundred and twenty-eight tones and a duration between one hundred and twelve nanoseconds and one hundred and twenty nanoseconds when the at least one OFDM symbol comprises at least one thousand and twenty-four tones.

34. The medium of claim 31, further comprising code that, when executed, causes an apparatus to convert the at least one OFDM symbol into a time domain signal using a five hundred and twelve point mode, wherein the channel bandwidth is approximately two thousand megahertz, wherein the at least one hundred and twenty-eight tones correspond to frequency subcarriers within the channel bandwidth, wherein the cyclic prefix comprises at most one hundred and twenty-eight tones and a duration between thirty nanoseconds and sixty-four nanoseconds when the at least one OFDM symbol comprises at least five hundred and twelve tones, wherein the cyclic prefix comprises at most two hundred and fifty-six tones and a duration between one hundred and four nanoseconds and one hundred and sixteen nanoseconds when the at least one OFDM symbol comprises at least one thousand and twenty-four tones, and wherein the cyclic prefix comprises at most two hundred and fifty-six tones and a duration between one hundred and four nanoseconds and one hundred and sixteen nanoseconds when the at least one OFDM symbol comprises at least two thousand and forty-eight tones.