Digital video broadcast service discovery

An apparatus comprising:

• a processor;
• and
• a memory storing executable instructions configured to, with the processor, cause the apparatus to at least:
• cause to be transmitted a first pilot orthogonal frequency division multiplexing (OFDM) symbol comprising a plurality of sparsely distributed active subcarriers;
• select a set of pseudorandom signaling sequences that is configured to provide signaling information within the plurality of sparsely distributed active subcarriers;
• and
• modulate, using differential binary phase shift keying, the plurality of sparsely distributed active subcarriers by the set of pseudorandom signaling sequences such that the signaling information is provided within the plurality of sparsely distributed active subcarriers.

A method comprising:

• receiving a first pilot orthogonal frequency division multiplexing (OFDM) symbol;
• performing a fast fourier transform on the first pilot OFDM symbol;
• detecting a frequency offset at least in part by finding a shifted subcarrier pattern;
• and
• differentially demodulating the first pilot OFDM symbol, by a processor, to generate an estimated pseudo random binary sequence.

An apparatus comprising:

• a processor;
• and
• a memory storing executable instructions configured to, with the processor, cause the apparatus to at least:
• receive a first pilot orthogonal frequency division multiplexing (OFDM) symbol;
• perform a fast fourier transform on the first pilot OFDM symbol;
• detect a frequency offset at least in part by finding a shifted subcarrier pattern;
• and
• differentially demodulate the first pilot OFDM symbol to generate an estimated pseudo random binary sequence.

One or more computer readable media comprising computer-executable instructions configured to, when executed, cause an apparatus to at least:

• cause to be transmitted a first pilot orthogonal frequency division multiplexing (OFDM) symbol comprising a plurality of sparsely distributed active subcarriers;
• select a set of pseudorandom signaling sequences that is configured to provide signaling information within the plurality of sparsely distributed active subcarriers;
• and
• modulate, using differential binary phase shift keying, the plurality of sparsely distributed active subcarriers by the set of pseudorandom signaling sequences such that the signaling information is provided within the plurality of sparsely distributed active subcarriers.

One or more computer readable media comprising computer-executable instructions configured to, when executed, cause an apparatus to at least:

• receive a first pilot orthogonal frequency division multiplexing (OFDM) symbol;
• perform a fast fourier transform on the first pilot OFDM symbol;
• detect a frequency offset at least in part by finding a shifted subcarrier pattern;
• and
• differentially demodulate the first pilot OFDM symbol to generate an estimated pseudo random binary sequence.