Implicit signaling in OFDM preamble with embedded signature sequence, and cyclic prefix and postfix aided signature detection

A method for recovering payload data in a received signal comprising Orthogonal Frequency Division multiplexed (OFDM) symbols, the method comprising:

• obtaining a time-domain signal of the received signal;
• obtaining a frequency-domain signal of the received signal;
• detecting, from the frequency-domain signal of the received signal, a preamble symbol of the OFDM symbols, the preamble symbol carrying physical layer signaling information which includes parameters for recovering the payload data;
• detecting, from the time-domain signal of the received signal, a signature sequence, wherein
• a first part of the signature sequence is modulated on a guard interval and a second part of the signature sequence is modulated on at least a portion of time-domain samples of the preamble symbol,
• the preamble symbol is immediately after the guard interval, and
• the signature sequence is a time-domain sequence and includes samples representing a message;
• and
• demodulating a frame of the received signal, the frame comprising at least the preamble symbol and payload symbols.

A receiver for recovering payload data in a received signal comprising Orthogonal Frequency Division multiplexed (OFDM) symbols, the receiver comprising:

• circuitry configured to:
• detect, from the received signal, a preamble symbol of the OFDM symbols and a signature sequence, wherein a first part of the signature sequence is modulated on a guard interval and a second part of the signature sequence is modulated on at least a portion of the preamble symbol;
• and
• demodulate a frame of the received signal, the frame comprising at least the preamble symbol and payload symbols, wherein
• the preamble symbol is immediately after the guard interval,
• the signature sequence is a time-domain signal including samples representing a message,
• the preamble symbol carries physical layer signaling information which includes parameters for recovering the payload data,
• the signature sequence includes samples representing a message, and
• the signature sequence belongs to a set of signature sequences, each signature sequence of the set of signature sequences corresponding to a different message.

A method for recovering payload data in a received signal comprising Orthogonal Frequency Division multiplexed (OFDM) symbols, the method comprising:

• detecting, from the received signal, a preamble symbol of the OFDM symbols and a signature sequence, wherein
• a first part of the signature sequence is modulated on a guard interval and a second part of the signature sequence is modulated on at least a portion of the preamble symbol;
• and
• demodulating a frame of the received signal, the frame comprising at least the preamble symbol and payload symbols, wherein
• the preamble symbol is immediately after the guard interval,
• the signature sequence is a time-domain signal, including samples representing a message,
• the preamble symbol carries physical layer signaling information which includes parameters for recovering the payload data,
• the signature sequence includes samples representing a message,
• the signature sequence belongs to a set of signature sequences, each signature sequence of the set of signature sequences corresponding to a different message.

A receiver for recovering payload data in a received signal comprising Orthogonal Frequency Division multiplexed (OFDM) symbols, the receiver comprising:

• circuitry configured to:
• obtain a time-domain signal of the received signal;
• obtain a frequency-domain signal of the received signal;
• detect, from the frequency-domain signal of the received signal, a preamble symbol of the OFDM symbols, the preamble symbol carrying physical layer signaling information which includes parameters for recovering the payload data;
• detect, from the time-domain signal of the received signal, a signature sequence, wherein a first part of the signature sequence is modulated on a guard interval and a second part of the signature sequence is modulated on at least a portion of time-domain samples of the preamble symbol;
• and
• demodulate a frame of the received signal, the frame comprising at least the preamble symbol and payload symbols, wherein
• the preamble symbol is immediately after the guard interval,
• the signature sequence is a time-domain sequence and includes samples representing a message, and
• the signature sequence is based on a Gold code sequence.

A method for recovering payload data in a received signal comprising Orthogonal Frequency Division multiplexed (OFDM) symbols, the method comprising:

• obtaining a time-domain signal of the received signal;
• obtaining a frequency-domain signal of the received signal;
• detecting, from the frequency-domain signal of the received signal, a preamble symbol of the OFDM symbols, the preamble symbol carrying physical layer signaling information which includes parameters for recovering the payload data;
• detecting, from the time-domain signal of the received signal, a signature sequence, wherein a first part of the signature sequence is modulated on a guard interval and a second part of the signature sequence is modulated on at least a portion of time-domain samples of the preamble symbol;
• and
• demodulating a frame of the received signal, the frame comprising at least the preamble symbol and payload symbols, wherein
• the preamble symbol is immediately after the guard interval,
• the signature sequence is a time-domain sequence and includes samples representing a message, and
• the signature sequence is based on a Gold code sequence.