Systems and methods for generating preamble symbols in communication systems

• US 10,530,546 B2
• Filed: 10/25/2018
• Issued: 01/07/2020
• Est. Priority Date: 01/30/2012
• Status: Active Grant

• Current Assignee: Marvell Asia Pte Limited (Marvell Technology Group Limited)
• Original Assignee: Marvell World Trade Limited (Marvell Technology Group Limited)
• Inventors: Zhang, Hongyuan, Srinivasa, Sudhir
• Primary Examiner(s): George, Ayanah S
• Application Number:
  US16/170,891
• Publication Number:
  US 20190089503A1
• Time in Patent Office: 439 Days
• Field of Search: None
• CPC Class Codes: H04L 27/2613 Structure of the reference signals
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04W 84/12 WLAN [Wireless Local Area Networks]

Abstract

A method for transmitting an 802.11ah packet is provided. A training field sequence is generated using control circuitry. A preamble for a packet is generated using the control circuitry. The preamble includes a training field symbol which includes the training field sequence. A portion of the training field sequence is within a plurality of guard tones of the training field symbol. The preamble is transmitted using transmit circuitry.

Claims

1. A method for transmitting a wireless packet, the method comprising:

generating, using control circuitry, a signaling field sequence including parameters for decoding the wireless packet for a first bandwidth, wherein the signaling field sequence has a first number count of tones that is less than a number count of tones in a training field sequence that includes channel estimation information;

generating, using the control circuitry, a signaling field sequence, for a second bandwidth that is a multiple of the first bandwidth, by transmitting the signaling field sequence for the first bandwidth in each of a plurality of sub-bands, wherein generating the signaling field sequence for the second bandwidth comprises generating a copy of the signaling field sequence for the first bandwidth, phase rotating the copy of the signaling field sequence, and transmitting the phase-rotated copy of the signaling field sequence in each of the plurality of sub-bands;

generating, using the control circuitry, a preamble for a packet, wherein the preamble comprises a training field sequence and the signaling field sequence for the second bandwidth, and wherein power varies across tones in the training field sequence for the first bandwidth and across tones in the training field sequence for the second bandwidth so that the training field sequence for the first bandwidth has a same time domain power as the training field sequence for the second bandwidth; and

transmitting, using transmit circuitry, the preamble.

2. The method of claim 1, wherein a number count of tones in the training field sequence for the second bandwidth is larger than the number count of tones in the training field sequence for the first bandwidth.

3. The method of claim 1, wherein generating a copy of the signaling field sequence for the first bandwidth, phase rotating the copy of the signaling field sequence, and transmitting the phase-rotated copy of the signaling field sequence in each of the plurality of sub-bands causes tones in the signaling field sequence for the second bandwidth to increase in number count from the first number count of tones to a second number count of tones that is larger than the first number count.

4. The method of claim 3, wherein generating a signaling field sequence comprises generating a number count of tones providing configuration parameters of the wireless packet.

5. The method of claim 4, wherein generating a signaling field sequence for a second bandwidth comprises generating the second number count of tones in the signaling field sequence, wherein the second number count of tones is equal to the number count of tones in the training field sequence.

6. The method of claim 4, wherein generating a signaling field sequence for a second bandwidth comprises generating the second number count of tones in the signaling field sequence, wherein the second number count of tones is less than the number count of tones in the training field sequence.

7. The method of claim 4, wherein generating a signaling field sequence for a second bandwidth comprises generating the second number count of tones such that each tone in the signaling field sequence for the second bandwidth has a corresponding tone among the number count of tones in the training field sequence.

8. The method of claim 1, wherein generating a signaling field sequence for the second bandwidth further comprises identifying for removal, using the control circuitry, selected tones among the first number count of tones in the signaling field sequence for the first bandwidth.

9. The method of claim 8, wherein identifying for removal selected tones comprises identifying reserve bits and identification information for removal.

10. The method of claim 9, wherein identifying reserve bits and identification information for removal comprises identifying for removal Partial Association Identification (PAID) bits used to identify a wireless station.

11. An apparatus for transmitting a wireless packet, the apparatus comprising:

field generation circuitry configured to;

generate a signaling field sequence including parameters for decoding the wireless packet for a first bandwidth, wherein the signaling field sequence has a first number count of tones that is less than a number count of tones in a training field sequence that includes channel estimation information; and

generate a signaling field sequence, for a second bandwidth that is a multiple of the first bandwidth, by transmitting the signaling field sequence for the first bandwidth in each of a plurality of sub-bands, wherein generating the signaling field sequence for the second bandwidth comprises generating a copy of the signaling field sequence for the first bandwidth, phase-rotating the copy of the signaling field sequence, and transmitting the phase-rotated copy of the signaling field sequence in each of the plurality of sub-bands;

preamble generation circuitry configured to generate a preamble for a packet, wherein the preamble comprises a training field sequence and the signaling field sequence for the second bandwidth, and wherein power varies across tones in the training field sequence for the first bandwidth and across tones in the training field sequence for the second bandwidth so that the training field sequence for the first bandwidth has a same time domain power as the training field sequence for the second bandwidth; and

transmit circuitry configured to transmit the preamble.

12. The apparatus of claim 11, wherein a number count of tones in the training field sequence for the second bandwidth is larger than the number count of tones in the training field sequence for the first bandwidth.

13. The apparatus of claim 11, wherein the preamble generation circuitry is configured to cause tones in the signaling field sequence for the second bandwidth to increase in number count from the first number count of tones to a second number count of tones that is larger than the first number count, by generating a copy of the signaling field sequence for the first bandwidth, phase rotating the copy of the signaling field sequence, and transmitting the phase-rotated copy of the signaling field sequence in each of the plurality of sub-bands.

14. The apparatus of claim 13, wherein the field generation circuitry is configured to generate the first number count of tones in the signaling field sequence to provide configuration parameters of the wireless packet.

15. The apparatus of claim 14, wherein the field generation circuitry is configured to generate the second number count of tones in the signaling field sequence for the second bandwidth such that the second number count of tones is equal to the number count of tones in the training field sequence.

16. The apparatus of claim 14, wherein the field generation circuitry is configured to generate the second number count of tones in the signaling field sequence for the second bandwidth such that the second number count of tones is less than the number count of tones in the training field sequence.

17. The apparatus of claim 14, wherein the field generation circuitry is configured to generate the second number count of tones in the signaling field sequence for the second bandwidth such that each tone in the signaling field sequence for the second bandwidth has a corresponding tone among the number count of tones in the training field sequence.

18. The apparatus of claim 11, wherein the field generation circuitry is further configured to identify for removal selected tones among the first number count of tones in the signaling field sequence for the first bandwidth.

19. The apparatus of claim 18, wherein the field generation circuitry is configured to select tones for removal that comprise reserve bits and identification information.

20. The apparatus of claim 19, wherein the field generation circuitry is configured to select tones for removal that include Partial Association Identification (PAID) bits used to identify a wireless station.