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

• US 10,630,411 B2
• Filed: 04/05/2017
• Issued: 04/21/2020
• 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:
  US15/480,109
• Publication Number:
  US 20170207873A1
• Time in Patent Office: 1,112 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 signaling termination of a frame control of a preamble of a broadcast communication frame in a broadcast network, comprising:

generating an initial Orthogonal Frequency Division Multiplexing (OFDM) symbol of the frame control using a modulation of a frequency domain Constant Amplitude Zero Auto-Correlation (CAZAC) sequence by a pseudo-noise (PN) sequence, wherein the frequency domain CAZAC sequence modulated by the PN sequence determines a service type associated with the broadcast communication frame and wherein the PN sequence is reset at a start of the preamble;

transmitting the initial OFDM symbol of the broadcast communication frame to a receiver;

generating a subsequent OFDM symbol of the frame control; and

transmitting the subsequent OFDM symbol of the broadcast communication frame to the receiver,

wherein when the subsequent OFDM symbol corresponds to a last OFDM symbol of the frame control, the subsequent OFDM symbol is characterized by a 180°

phase inversion of the frequency domain CAZAC sequence to signal, to the receiver, the termination of the frame control of the broadcast communication frame such that the frame control includes an extensible number of OFDM symbols to increase signaling capacity.

2. The method of claim 1, wherein the CAZAC sequence includes a Zadoff-Chu (ZC) sequence.

3. The method of claim 1, further comprising:

selecting a root index value from a set of root index values;

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

4. The method of claim 3, further comprising:

modulating the frequency domain CAZAC sequence by the 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.

5. The method of claim 1, wherein a portion of the frame control employs a fixed configuration known to the receiver.

6. A transmitter configured to be used in a broadcast network, the transmitter 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 preamble of a broadcast communication frame using a modulation of a frequency domain Constant Amplitude Zero Auto-Correlation (CAZAC) sequence by a pseudo-noise (PN) sequence, wherein the frequency domain CAZAC sequence modulated by the PN sequence determines a service type associated with the broadcast communication frame and wherein the PN sequence is reset at a start of the preamble;

transmit the initial OFDM symbol of the broadcast communication frame to a receiver in the broadcast network;

generate a subsequent OFDM symbol of the frame control; and

transmit the subsequent OFDM symbol of the broadcast communication frame to the receiver in the broadcast network,

wherein when the subsequent OFDM symbol corresponds to a last OFDM symbol of the frame control, the subsequent OFDM symbol is characterized by a 180°

phase inversion of the frequency domain CAZAC sequence to signal, to the receiver, termination of the frame control of the broadcast communication frame such that the frame control includes an extensible number of OFDM symbols to increase signaling capacity.

7. The transmitter of claim 6, wherein the CAZAC sequence includes a Zadoff-Chu (ZC) sequence.

8. The transmitter of claim 6, wherein the processor, upon executing the instructions, is further configured to:

select a root index value from a set of root index values;

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

9. The transmitter of claim 8, wherein the processor, upon executing the instructions, is further configured to:

modulate the frequency domain CAZAC sequence by the 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.

10. The transmitter of claim 6, a portion of the frame control employs a fixed configuration known to the receiver.