Doppler midamble signaling for wireless communications

• US 20180006687A1
• Filed: 08/29/2017
• Published: 01/04/2018
• Est. Priority Date: 04/24/2011
• Status: Active Grant

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: Avago Technologies General IP (Singapore) PTE Limited (Broadcom, Inc.)
• Inventors: Porat, Ron
• Granted Patent: US 10,530,430 B2
• Time in Patent Office: Days
• CPC Class Codes: H04B 2201/70706 with means for reducing the peak-to-average power ratio
• CPC Class Codes: H04B 7/0413 MIMO systems
• CPC Class Codes: H04L 1/00 Arrangements for detecting or preventing errors in the information received correcting synchronisation H04L7/00
• CPC Class Codes: H04L 1/004 by using forward error control H04L1/0618 takes precedence; coding, decoding or code conversion, for error detection or correction H03M13/00
• CPC Class Codes: H04L 1/0618 Space-time coding
• CPC Class Codes: H04L 25/0202 Channel estimation
• 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: H04L 27/26035 Maintenance of orthogonality, e.g. for signals exchanged between cells or users, or by using covering codes or sequences using different training sequence per antenna H04B7/0684; code allocation H04J13/16
• CPC Class Codes: H04L 27/2613 Structure of the reference signals
• CPC Class Codes: H04L 27/26132 using repetition
• CPC Class Codes: H04L 27/2621 Reduction thereof using phase offsets between subcarriers
• CPC Class Codes: H04L 27/2666 Acquisition of further OFDM parameters, e.g. bandwidth, subcarrier spacing, or guard interval length
• CPC Class Codes: H04W 84/12 WLAN [Wireless Local Area Networks]
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A wireless communication device (alternatively, device, WDEV, etc.) includes at least one processing circuitry configured to support communications with other WDEV(s) and to generate and process signals for such communications. In some examples, the device includes a communication interface and a processing circuitry, among other possible circuitries, components, elements, etc. to support communications with other WDEV(s) and to generate and process signals for such communications. The wireless communication device is configured to generate an orthogonal frequency division multiplexing (OFDM) packet that includes a preamble followed by data symbol(s) followed by a midamble followed by other data symbol(s). The wireless communication device is also configured to transmit the OFDM packet to another wireless communication device to be processed by the other wireless communication device to perform channel estimation of a wireless communication channel using at least one of the preamble or the midamble.

Claims

1. A wireless communication device comprising:

a communication interface; and

processing circuitry that is coupled to the communication interface, wherein at least one of the communication interface or the processing circuitry configured to;

generate an orthogonal frequency division multiplexing (OFDM) packet that includes a preamble followed by a first one or more data symbols followed by a midamble followed by a second one or more data symbols; and

transmit the OFDM packet to another wireless communication device to be processed by the another wireless communication device to perform channel estimation of a wireless communication channel between the wireless communication device and the another wireless communication device using at least one of the preamble or the midamble.

2. The wireless communication device of claim 1, wherein:

the preamble includes a first one or more long training fields (LTFs) and the midamble includes a second one or more LTFs;

each of the first one or more LTFs and the second one or more LTFs includes a same number of LTFs; and

the OFDM packet to be processed by the another wireless communication device to perform a first channel estimation of the wireless communication channel between the wireless communication device using the preamble and a second channel estimation of the wireless communication channel between the wireless communication device using the midamble.

3. The wireless communication device of claim 1, wherein:

the preamble includes a first one or more fields based on a first communication protocol followed by a second one or more fields based on a second communication protocol;

the first communication protocol is a legacy communication protocol to the second communication protocol;

the first one or more fields includes a first signal field (SIG);

the second one or more fields includes a second SIG followed by one or more short training fields (STFs) followed by a first one or more long training fields (LTFs);

the midamble includes a second one or more LTFs; and

each of the first one or more LTFs and the second one or more LTFs includes a same number of LTFs.

4. The wireless communication device of claim 1, wherein the at least one of the communication interface or the processing circuitry is further configured to:

generate another OFDM packet that includes another preamble followed by a third one or more data symbols followed by another midamble followed by a fourth one or more data symbols; and

transmit the another OFDM packet to the another wireless communication device to be processed by the another wireless communication device to perform channel estimation of the wireless communication channel between the wireless communication device and the another wireless communication device using at least one of the another preamble or the another midamble; and

wherein;

each of the first one or more data symbols and the second one or more data symbols includes a first same number of data symbols; and

each of the third one or more data symbols and the fourth one or more data symbols includes a second same number of data symbols that is different than the first same number of data symbols.

5. The wireless communication device of claim 1, wherein the at least one of the communication interface or the processing circuitry is further configured to:

perform a capabilities exchange with the another wireless communication device to coordinate a doppler operational mode among a plurality of doppler operational modes including a low doppler operational mode, a medium doppler operational mode, and a high doppler operational mode, wherein the doppler operational mode that is coordinated specifies a number of data symbols within each of the first one or more data symbols and the second one or more data symbols.

6. The wireless communication device of claim 1, wherein the OFDM packet includes an orthogonal frequency division multiple access (OFDMA) packet that is modulated based on a plurality of OFDMA sub-carriers and includes first data intended for the another wireless communication device that is modulated within a first subset of the plurality of OFDMA sub-carriers and second data intended for at least one other wireless communication device that is modulated within a second subset of the plurality of OFDMA sub-carriers.

7. The wireless communication device of claim 1 further comprising:

an access point (AP), wherein the another wireless communication device includes a wireless station (STA).

8. The wireless communication device of claim 1 further comprising:

a wireless station (STA), wherein the another wireless communication device includes an access point (AP).

9. A wireless communication device comprising:

a communication interface; and

processing circuitry that is coupled to the communication interface, wherein at least one of the communication interface or the processing circuitry configured to;

perform a capabilities exchange with another wireless communication device to coordinate a doppler operational mode among a plurality of doppler operational modes including a low doppler operational mode, a medium doppler operational mode, and a high doppler operational mode, wherein the doppler operational mode that is coordinated specifies a number of data symbols within each of a first one or more data symbols and a second one or more data symbols of an orthogonal frequency division multiple access (OFDMA) packet;

generate the OFDM packet that includes a preamble followed by the first one or more data symbols followed by a midamble followed by the second one or more data symbols, wherein the preamble includes a first one or more long training fields (LTFs) and the midamble includes a second one or more LTFs, and wherein each of the first one or more LTFs and the second one or more LTFs includes a same number of LTFs; and

transmit the OFDM packet to the another wireless communication device to be processed by the another wireless communication device to perform a first channel estimation of a wireless communication channel between the wireless communication device using the preamble and a second channel estimation of the wireless communication channel between the wireless communication device using the midamble.

10. The wireless communication device of claim 9, wherein:

the preamble includes a first one or more fields based on a first communication protocol followed by a second one or more fields based on a second communication protocol;

the first communication protocol is a legacy communication protocol to the second communication protocol;

the first one or more fields includes a first signal field (SIG);

the second one or more fields includes a second SIG followed by one or more short training fields (STFs) followed by the first one or more LTFs; and

the midamble includes the second one or more LTFs.

11. The wireless communication device of claim 9, wherein the at least one of the communication interface or the processing circuitry is further configured to:

generate another OFDM packet that includes another preamble followed by a third one or more data symbols followed by another midamble followed by a fourth one or more data symbols; and

transmit the another OFDM packet to the another wireless communication device to be processed by the another wireless communication device to perform a third channel estimation of the wireless communication channel between the wireless communication device using the another preamble and a fourth channel estimation of the wireless communication channel between the wireless communication device using the another midamble; and

wherein;

each of the first one or more data symbols and the second one or more data symbols includes a first same number of data symbols; and

each of the third one or more data symbols and the fourth one or more data symbols includes a second same number of data symbols that is different than the first same number of data symbols.

12. The wireless communication device of claim 9, wherein the OFDM packet includes an orthogonal frequency division multiple access (OFDMA) packet that is modulated based on a plurality of OFDMA sub-carriers and includes first data intended for the another wireless communication device that is modulated within a first subset of the plurality of OFDMA sub-carriers and second data intended for at least one other wireless communication device that is modulated within a second subset of the plurality of OFDMA sub-carriers.

13. The wireless communication device of claim 9 further comprising:

an access point (AP), wherein the another wireless communication device includes a wireless station (STA).

14. A method for execution by a wireless communication device, the method comprising:

generating an orthogonal frequency division multiplexing (OFDM) packet that includes a preamble followed by a first one or more data symbols followed by a midamble followed by a second one or more data symbols; and

transmitting, via a communication interface of the wireless communication device, the OFDM packet to another wireless communication device to be processed by the another wireless communication device to perform channel estimation of a wireless communication channel between the wireless communication device and the another wireless communication device using at least one of the preamble or the midamble.

15. The method of claim 14, wherein:

the preamble includes a first one or more long training fields (LTFs) and the midamble includes a second one or more LTFs;

each of the first one or more LTFs and the second one or more LTFs includes a same number of LTFs; and

the OFDM packet to be processed by the another wireless communication device to perform a first channel estimation of the wireless communication channel between the wireless communication device using the preamble and a second channel estimation of the wireless communication channel between the wireless communication device using the midamble.

16. The method of claim 14, wherein:

the preamble includes a first one or more fields based on a first communication protocol followed by a second one or more fields based on a second communication protocol;

the first communication protocol is a legacy communication protocol to the second communication protocol;

the first one or more fields includes a first signal field (SIG);

the second one or more fields includes a second SIG followed by one or more short training fields (STFs) followed by a first one or more long training fields (LTFs);

the midamble includes a second one or more LTFs; and

each of the first one or more LTFs and the second one or more LTFs includes a same number of LTFs.

17. The method of claim 14 further comprising:

generating another OFDM packet that includes another preamble followed by a third one or more data symbols followed by another midamble followed by a fourth one or more data symbols; and

transmitting, via the communication interface of the wireless communication device, the another OFDM packet to the another wireless communication device to be processed by the another wireless communication device to perform channel estimation of the wireless communication channel between the wireless communication device and the another wireless communication device using at least one of the another preamble or the another midamble; and

wherein;

each of the first one or more data symbols and the second one or more data symbols includes a first same number of data symbols; and

each of the third one or more data symbols and the fourth one or more data symbols includes a second same number of data symbols that is different than the first same number of data symbols.

18. The method of claim 14 further comprising:

performing a capabilities exchange with the another wireless communication device to coordinate a doppler operational mode among a plurality of doppler operational modes including a low doppler operational mode, a medium doppler operational mode, and a high doppler operational mode, wherein the doppler operational mode that is coordinated specifies a number of data symbols within each of the first one or more data symbols and the second one or more data symbols.

19. The method of claim 14, wherein the OFDM packet includes an orthogonal frequency division multiple access (OFDMA) packet that is modulated based on a plurality of OFDMA sub-carriers and includes first data intended for the another wireless communication device that is modulated within a first subset of the plurality of OFDMA sub-carriers and second data intended for at least one other wireless communication device that is modulated within a second subset of the plurality of OFDMA sub-carriers.

20. The method of claim 14, wherein the wireless communication device includes an access point (AP), and the another wireless communication device includes a wireless station (STA).