Dynamic configuration of a flexible orthogonal frequency division multiplexing PHY transport data frame preamble

• US 10,833,789 B2
• Filed: 04/05/2017
• Issued: 11/10/2020
• Est. Priority Date: 08/25/2014
• Status: Active Grant

• Current Assignee: One Media LLC (Sinclair, Inc.)
• Original Assignee: One Media LLC (Sinclair, Inc.)
• Inventors: Shelby, Kevin A., Simon, Michael J., Earnshaw, Mark, Raza, Zahir Jaffer
• Primary Examiner(s): Wong, Linda
• Application Number:
  US15/480,106
• Publication Number:
  US 20170207945A1
• Time in Patent Office: 1,315 Days
• CPC Class Codes: H04J 11/00 Orthogonal multiplex systems, e.g. using WALSH codesH04J13/00 takes precedence
• CPC Class Codes: H04J 13/0059 CAZAC [constant-amplitude and zero auto-correlation]
• CPC Class Codes: H04J 13/0062 Zadoff-Chu
• CPC Class Codes: H04J 13/14 Generation of codes with a zero correlation zone
• CPC Class Codes: H04L 27/26136 Pilot sequence conveying additional information
• CPC Class Codes: H04L 27/2627 Modulators
• CPC Class Codes: H04L 27/2646 using feedback from receiver for adjusting OFDM transmission parameters, e.g. transmission timing or guard interval length
• CPC Class Codes: H04L 27/2656 Frame synchronisation, e.g. packet synchronisation, time division duplex [TDD] switching point detection or subframe synchronisation
• CPC Class Codes: H04L 27/2663 Coarse synchronisation, e.g. by correlation
• CPC Class Codes: H04L 27/2692 with preamble design, i.e. with negotiation of the synchronisation sequence with transmitter or sequence linked to the algorithm used at the receiver
• CPC Class Codes: H04L 5/0044 allocation of payload
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver

Abstract

A method for operating a transmitting device to communicate with a receiving device is described herein. The method includes the step of the transmitting device selecting a root index value from a set of root index values. The method further includes the step of the transmitting device generating a frequency domain Constant Amplitude Zero Auto-Correlation sequence based on the selected root index value. The method further includes the step of the transmitting device modulating the Constant Amplitude Zero Auto-Correlation sequence by a pseudo-noise sequence. The method further includes the step of the transmitting device generating an Orthogonal Frequency Division Multiplexing symbol, wherein the frequency domain Constant Amplitude Zero Auto-Correlation sequence modulated by the pseudo-noise sequence defines subcarrier values for the Orthogonal Frequency Division Multiplexing symbol. The method further includes the step of the transmitting device transmitting the Orthogonal Frequency Division Multiplexing symbol as an initial Orthogonal Frequency Division Multiplexing symbol of a preamble of a frame to the receiving device.

Claims

1. A method for generating a frame control of a broadcast frame in a broadcast network, the method comprising:

generating, by a base station or a broadcast gateway of the broadcast network, an initial Orthogonal Frequency Division Multiplexing (OFDM) symbol of the frame control using a first sequence, wherein the initial OFDM symbol is a synchronization symbol configured to enable synchronization and initial channel estimation at a receiver, and wherein the first sequence is generated based on a Zadoff-Chu (ZC) root index value;

transmitting, by the base station or the broadcast gateway of the broadcast network, the initial OFDM symbol of the frame control of the broadcast frame to the receiver;

determining, by the base station or the broadcast gateway of the broadcast network, a first cyclic shift based on information to be signaled to the receiver, wherein the information used for determining the first cyclic shift comprises frame configuration information associated with the broadcast frame;

applying, by the base station or the broadcast gateway of the broadcast network, the first cyclic shift to the first sequence to generate a second sequence, wherein the second sequence is based on the ZC root index value;

generating, by the base station or the broadcast gateway of the broadcast network, a second OFDM symbol of the frame control using the second sequence;

transmitting, by the base station or the broadcast gateway of the broadcast network, the second OFDM symbol of the frame control of the broadcast frame to the receiver;

applying, by the base station or the broadcast gateway of the broadcast network, a second cyclic shift to the first sequence to generate a third sequence, wherein the third sequence is based on the ZC root index value and wherein the second cyclic shift is based on the frame configuration information associated with the broadcast frame;

generating, by the base station or the broadcast gateway of the broadcast network, a third OFDM symbol of the frame control using the third sequence; and

transmitting, by the base station or the broadcast gateway of the broadcast network, the third OFDM symbol of the frame control of the broadcast frame to the receiver.

2. The method of claim 1, wherein the first sequence is a frequency domain Constant Amplitude Zero Auto-Correlation (CAZAC) sequence.

3. The method of claim 2, wherein the CAZAC sequence includes a Zadoff-Chu (ZC) sequence.

4. The method of claim 2, further comprising:

selecting the ZC root index value from a set of root index values; and

generating the frequency domain CAZAC sequence based on the selected ZC root index value.

5. The method of claim 2, further comprising:

modulating the frequency domain CAZAC sequence by a pseudo-noise (PN) sequence to generate a complex sequence; and

mapping the complex sequence to a plurality of subcarriers to generate the initial OFDM symbol.

6. The method of claim 5, further comprising:

generating the PN sequence using a linear feedback shift register.

7. The method of claim 1, wherein the frame configuration information comprises parameters of a preamble of the broadcast frame or an interval of the broadcast frame.

8. The method of claim 1, wherein the broadcast frame is an Advanced Television Systems Committee (ATSC) 3.0 broadcast frame.

9. A transmitter of a base station or a broadcast gateway in a broadcast network, comprising:

a memory storing program instructions; and

a processor, upon executing the program instructions, configured to;

generate an initial Orthogonal Frequency Division Multiplexing (OFDM) symbol of a frame control of a broadcast frame in the broadcast network using a first sequence, wherein the initial OFDM symbol is a synchronization symbol configured to enable synchronization and initial channel estimation at a receiver, and wherein the first sequence is generated based on a Zadoff-Chu (ZC) root index value;

transmit the initial OFDM symbol of the frame control of the broadcast frame to the receiver;

determine a first cyclic shift based on information to be signaled to the receiver, wherein the information used for determining the first cyclic shift comprises frame configuration information associated with the broadcast frame;

apply the first cyclic shift to the first sequence to generate a second sequence, wherein the second sequence is based on the ZC root index value;

generate a second OFDM symbol of the frame control using the second sequence;

transmit the second OFDM symbol of the frame control of the broadcast frame to the receiver;

apply a second cyclic shift to the first sequence to generate a third sequence, wherein the third sequence is based on the ZC root index value and wherein the second cyclic shift is based on the frame configuration information associated with the broadcast frame;

generate a third OFDM symbol of the frame control using the third sequence; and

transmit the third OFDM symbol of the frame control of the broadcast frame to the receiver.

10. The transmitter of claim 9, wherein the first sequence is a frequency domain Constant Amplitude Zero Auto-Correlation (CAZAC) sequence.

11. The transmitter of claim 10, wherein the CAZAC sequence includes a Zadoff-Chu (ZC) sequence.

12. The transmitter of claim 10, wherein the processor, upon executing the instructions, is further configured to:

select the ZC root index value from a set of root index values; and

generate the frequency domain CAZAC sequence based on the selected ZC root index value.

13. The transmitter of claim 10, wherein the processor, upon executing the instructions, is further configured to:

modulate the frequency domain CAZAC sequence by a pseudo-noise (PN) sequence to generate a complex sequence; and

map the complex sequence to a plurality of subcarriers to generate the initial OFDM symbol.

14. The transmitter of claim 13, wherein the processor, upon executing the instructions, is further configured to:

generate the PN sequence using a linear feedback shift register.

15. The transmitter of claim 9, wherein the frame configuration information comprises parameters of a preamble of the broadcast frame or an interval of the broadcast frame.

16. The transmitter of claim 9, wherein the broadcast frame is an Advanced Television Systems Committee (ATSC) 3.0 communication frame.

17. The transmitter of claim 9, wherein the first and second cyclic shifts comprise values to convey the frame configuration information associated with the broadcast frame to the receiver.

18. The transmitter of claim 9, wherein the first sequence identifies at least one of a service class, an operating mode, or a transmitter operator.

19. A transmitter of a base station or a broadcast gateway in a broadcast network for generating a frame control of a broadcast frame, the transmitter comprising:

means for generating an initial Orthogonal Frequency Division Multiplexing (OFDM) symbol of the frame control using a first sequence, wherein the initial OFDM symbol is a synchronization symbol configured to enable synchronization and initial channel estimation at a receiver, and wherein the first sequence is generated based on a Zadoff-Chu (ZC) root index value;

means for transmitting the initial OFDM symbol of the frame control of the broadcast frame to the receiver;

means for determining a first cyclic shift based on information to be signaled to the receiver, wherein the information used for determining the first cyclic shift comprises frame configuration information associated with the broadcast frame;

means for applying the first cyclic shift to the first sequence to generate a second sequence, wherein the second sequence is based on the ZC root index value;

means for generating a second OFDM symbol of the frame control using the second sequence;

means for transmitting the second OFDM symbol of the frame control of the broadcast frame to the receiver;

means for applying a second cyclic shift to the first sequence to generate a third sequence, wherein the third sequence is based on the ZC root index value and wherein the second cyclic shift is based on the frame configuration information associated with the broadcast frame;

means for generating a third OFDM symbol of the frame control using the third sequence; and

means for transmitting the third OFDM symbol of the frame control of the broadcast frame to the receiver.