Detecting delimiters for low-overhead communication in a network

• US 9,326,317 B2
• Filed: 01/08/2014
• Issued: 04/26/2016
• Est. Priority Date: 04/12/2010
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Yonge, Lawrence Winston III, Katar, Srinivas
• Primary Examiner(s): KHIRODHAR, MAHARISHI V
• Application Number:
  US14/150,605
• Publication Number:
  US 20140119351A1
• Time in Patent Office: 839 Days
• Field of Search: 370/241
• US Class Current: 1/1
• CPC Class Codes: H04L 1/1635 Cumulative acknowledgement, i.e. the acknowledgement message applying to all previous messages
• CPC Class Codes: H04L 1/1854 Scheduling and prioritising arrangements
• CPC Class Codes: H04L 12/413 with random access, e.g. carrier-sense multiple-access with collision detection [CSMA-CD]
• CPC Class Codes: H04L 12/4135 using bit-wise arbitration
• CPC Class Codes: H04L 25/0204 of multiple channels
• CPC Class Codes: H04L 25/0232 by interpolation between sounding signals
• CPC Class Codes: H04L 25/0236 using estimation of the other symbols
• CPC Class Codes: H04L 25/20 Repeater circuits; Relay circuits
• CPC Class Codes: H04L 27/2602 Signal structure
• CPC Class Codes: H04L 27/2603 Signal structure ensuring backward compatibility with legacy system
• CPC Class Codes: H04W 84/047 using dedicated repeater stations
• CPC Class Codes: H04W 88/04 adapted for relaying to or from another terminal or user

Abstract

A waveform communicated from a first station to a second station over a shared medium may include at least the first symbol comprising a first set of frequency components at predetermined carrier frequencies modulated with preamble information and a second set of frequency components at predetermined carrier frequencies modulated with frame control information. The first symbol may comprise a single symbol delimiter.

Claims

1. A method for receiving a delimiter, the method comprising:

receiving, via a communication medium at a second station, a first symbol from a first station, wherein

the first symbol includes at least,

a first set of frequency components at predetermined carrier frequencies modulated with preamble information, and

a second set of frequency components at predetermined carrier frequencies modulated with frame control information, and

the first symbol comprises a single symbol delimiter.

2. The method of claim 1, further comprising:

detecting a start of the first symbol at one of multiple time slot boundaries, the detecting including, after each of the multiple time slot boundaries,

periodically sampling values received via the communication medium starting at a beginning of a most recent time slot boundary of the multiple time slot boundaries, and

processing the sampled values to generate a metric value that indicates whether the start of the first symbol has been detected; and

demodulating, at the second station, the first symbol from the sampled values in response to detecting the start of the first symbol.

3. The method of claim 1, wherein the first symbol is preceded by a prefix representing a cyclic extension of a terminal portion of the first symbol.

4. The method of claim 1, wherein

the first symbol is received from the first station via a waveform,

a first portion of the waveform comprises the first symbol, the first symbol comprising a segment, and

a second portion of the waveform comprises a copy of the segment that is correlated with at least the segment.

5. The method of claim 4, wherein the second portion is received prior to the first portion.

6. The method of claim 1, wherein the first symbol has a predetermined symbol length that is greater than a time duration between adjacent time slot boundaries.

7. The method of claim 1, wherein the first symbol is followed by a suffix representing a cyclic extension of an initial portion of the first symbol.

8. The method of claim 1, wherein the single symbol delimiter comprises a start of a frame delimiter.

9. The method of claim 1, wherein the first symbol is followed by a second symbol having payload data.

10. An apparatus comprising:

a processor; and

memory for storing instructions which, when executed by the processor, cause the apparatus to receive, via a communication medium, a first symbol from a first station, wherein

the first symbol includes at least,

a first set of frequency components at predetermined carrier frequencies modulated with preamble information, and

a second set of frequency components at predetermined carrier frequencies modulated with frame control information, and

the first symbol comprises a single symbol delimiter.

11. The apparatus of claim 10, wherein the instructions, when executed by the processor, cause the apparatus to:

detect a start of the first symbol at one of multiple time slot boundaries, the detecting including, after each of the multiple time slot boundaries,

periodically sampling values received via the communication medium starting at a beginning of a most recent time slot boundary of the multiple time slot boundaries, and

processing the sampled values to generate a metric value that indicates whether the start of the first symbol has been detected; and

demodulate the first symbol from the sampled values in response to detecting the start of the first symbol.

12. The apparatus of claim 10, wherein the first symbol is preceded by a prefix representing a cyclic extension of a terminal portion of the first symbol.

13. The apparatus of claim 10, wherein

the first symbol is received from the first station via a waveform,

a first portion of the waveform comprises the first symbol, the first symbol comprising a segment, and

a second portion of the waveform comprises a copy of the segment that is correlated with at least the segment.

14. The apparatus of claim 13, wherein the second portion is received prior to the first portion.

15. The apparatus of claim 10, wherein the first symbol is followed by a suffix representing a cyclic extension of an initial portion of the first symbol.

16. A non-transitory computer readable medium storing instructions which, when executed by a processor of a first station, cause the first station to perform operations comprising:

receiving, via a communication medium at a second station, a first symbol, wherein the first symbol includes at least,

a first set of frequency components at predetermined carrier frequencies modulated with preamble information, and

a second set of frequency components at predetermined carrier frequencies modulated with frame control information, and

the first symbol comprises a single symbol delimiter.

17. The non-transitory computer readable medium of claim 16, wherein the instructions, when executed by the processor, cause the first station to perform operations that further comprise:

detect a start of the first symbol at one of multiple time slot boundaries, the detecting

including, after each of the multiple time slot boundaries,

periodically sampling values received via the communication medium starting at a beginning of a most recent time slot boundary of the multiple time slot boundaries, and

processing the sampled values to generate a metric value that indicates whether the start of the first symbol has been detected; and

demodulating, at the second station, the first symbol from the sampled values in response to detecting the start of the first symbol.

18. The non-transitory computer readable medium of claim 16, wherein the first symbol is preceded by a prefix representing a cyclic extension of a terminal portion of the first symbol.

19. The non-transitory computer readable medium of claim 16, wherein

the first symbol is received from the first station via a waveform,

a first portion of the waveform comprises the first symbol, the first symbol comprising a segment, and

a second portion of the waveform comprises a copy of the segment that is correlated with at least the segment.

20. The non-transitory computer readable medium of claim 19, wherein the second portion is received prior to the first portion.