Reception apparatus, reception method, program, and reception system

A reception method for causing a reception apparatus to execute a procedure comprising:

• receiving an orthogonal frequency division multiplexing (OFDM) signal formed by modulating common packet sequences and data packet sequences, said common packet sequences being made up of packets common to a plurality of streams, said data packet sequences being constituted by packets unique to each of said plurality of streams;
• acquiring decoding information for decoding original streams from said common packet sequences and said data packet sequences obtained by demodulating the received OFDM signal;
• searching for a common packet sequence needed to decode the original streams from a designated data packet sequence on the basis of the acquired decoding information;
• storing the decoding information about the acquired common packet sequences until the decoding information about said designated data packet sequence is acquired;
• and
• searching, when the decoding information about said designated data packet sequence is acquired, the stored decoding information about said common packet sequences for the decoding information identified by the decoding information about the acquired data packet sequences.

A non-transitory computer-readable medium comprising a program for causing a computer to execute a procedure comprising:

• receiving an orthogonal frequency division multiplexing signal known as an OFDM signal formed by modulating common packet sequences and data packet sequences, said common packet sequences being made up of packets common to a plurality of streams, said data packet sequences being constituted by packets unique to each of said plurality of streams;
• acquiring decoding information for decoding original streams from said common packet sequences and said data packet sequences obtained by demodulating the received OFDM signal;
• searching for a common packet sequence needed to decode the original streams from a designated data packet sequence on the basis of the acquired decoding information;
• storing the decoding information about the acquired common packet sequences until the decoding information about said designated data packet sequence is acquired;
• and
• searching, when the decoding information about said designated data packet sequence is acquired, the stored decoding information about said common packet sequences for the decoding information identified by the decoding information about the acquired data packet sequences.

A reception system comprising:

• communication interface circuitry configured to acquire via a transmission channel an orthogonal frequency division multiplexing (OFDM) signal formed by modulating common packet sequences and data packet sequences, said common packet sequences being made up of packets common to a plurality of streams, said data packet sequences being constituted by packets unique to each of said plurality of streams;
• processing circuitry configured to perform a transmission channel decoding process including at least a packet sequence decoding process on said OFDM signal acquired via said transmission channel;
• wherein said processing circuitry is configured to:
• acquire decoding information for decoding original streams from said common packet sequences and said data packet sequences obtained by demodulating said OFDM signal received via said transmission channel, and
• search for a common packet sequence needed to decode the original streams from a designated data packet sequence on the basis of the acquired decoding information;
• and
• a memory configured to store the decoding information about the acquired common packet sequences until the decoding information about said designated data packet sequence is acquired, wherein
• when the decoding information about said designated data packet sequence is acquired, said processing circuitry searches the stored decoding information about said common packet sequences for the decoding information identified by the decoding information about the acquired data packet sequences.

A reception system comprising:

• transmission channel decoding circuitry configured to perform a transmission channel decoding process including at least a packet sequence decoding process on an orthogonal frequency division multiplexing (OFDM) signal acquired via a transmission channel and formed by modulating common packet sequences and data packet sequences, said common packet sequences being made up of packets common to a plurality of streams, said data packet sequences being constituted by packets unique to each of said plurality of streams;
• information source decoding circuitry configured to perform an information source decoding process including at least a data decompression process on the OFDM signal having undergone said transmission channel decoding process;
• wherein said transmission channel decoding circuitry is configured to:
• acquire decoding information for decoding original streams from said common packet sequences and said data packet sequences obtained by demodulating said OFDM signal acquired via said transmission channel, and
• search for a common packet sequence needed to decode the original streams from a designated data packet sequence on the basis of the acquired decoding information;
• and
• a memory configured to store the decoding information about the acquired common packet sequences until the decoding information about said designated data packet sequence is acquired, wherein
• when the decoding information about said designated data packet sequence is acquired, said transmission channel decoding circuitry searches the stored decoding information about said common packet sequences for the decoding information identified by the decoding information about the acquired data packet sequences.

A reception system comprising:

• transmission channel decoding circuitry configured to perform a transmission channel decoding process including at least a packet sequence decoding process on an orthogonal frequency division multiplexing (OFDM) signal acquired via a transmission channel and formed by modulating common packet sequences and data packet sequences, said common packet sequences being made up of packets common to a plurality of streams, said data packet sequences being constituted by packets unique to each of said plurality of streams;
• output circuitry configured to output an image or a sound based on the OFDM signal having undergone said transmission channel decoding process;
• wherein said transmission channel decoding circuitry is configured to
• acquire decoding information for decoding original streams from said common packet sequences and said data packet sequences obtained by demodulating said OFDM signal acquired via said transmission channel, and
• search for a common packet sequence needed to decode the original streams from a designated data packet sequence on the basis of the acquired decoding information;
• and
• a memory configured to store the decoding information about the acquired common packet sequences until the decoding information about said designated data packet sequence is acquired, wherein
• when the decoding information about said designated data packet sequence is acquired, said transmission channel decoding circuitry searches the stored decoding information about said common packet sequences for the decoding information identified by the decoding information about the acquired data packet sequences.

A reception system comprising:

• transmission channel decoding circuitry configured to perform a transmission channel decoding process including at least a packet sequence decoding process on an orthogonal frequency division multiplexing (OFDM) signal acquired via a transmission channel and formed by modulating common packet sequences and data packet sequences, said common packet sequences being made up of packets common to a plurality of streams, said data packet sequences being constituted by packets unique to each of said plurality of streams;
• and
• recording circuitry configured to record the OFDM signal having undergone said transmission channel decoding process;
• wherein said transmission channel decoding circuitry is configured to
• acquire decoding information for decoding original streams from said common packet sequences and said data packet sequences obtained by demodulating said OFDM signal acquired via said transmission channel, and
• search for a common packet sequence needed to decode the original streams from a designated data packet sequence on the basis of the acquired decoding information;
• and
• a memory configured to store the decoding information about the acquired common packet sequences until the decoding information about said designated data packet sequence is acquired, wherein
• when the decoding information about said designated data packet sequence is acquired, said transmission channel decoding circuitry searches the stored decoding information about said common packet sequences for the decoding information identified by the decoding information about the acquired data packet sequences.