Communication system, transmitting apparatus and transmitting method, receiving apparatus and receiving method, unbalance code mixing method and multiple code decoding method

A transmitting apparatus for transmitting information using a non-spread spectrum system, comprising:

• frame segmenting means for segmenting transmission information into a plurality of frames;
• encoding means for encoding each frame;
• power amplification means for power amplifying each encoded signal with different amplitude;
• said power amplification means changes a rate of amplitude amplification for each frame according to a decoding capability in a receiving station side;
• interleaving means for interleaving all signals with each amplified signal collected into one channel;
• transmitting means for transmitting a transmission signal obtained by the interleaving via the one channel;
• and
• propagation path condition monitoring means for monitoring propagation path conditions such as traffic conditions at predetermined intervals, wherein said power amplification means updates an amplitude value of each code with reference to a number of interference signals satisfying predetermined criteria, defining considerable interference signals, updated number of code words for one frame, and noise power according to said propagation path conditions.

A transmitting method for transmitting information using a non-spread spectrum system, comprising:

• segmenting transmission information into a plurality of frames;
• encoding each frame;
• power amplifying each encoded signal with different amplitude said power amplification means changes a rate of amplitude amplification for each frame according to a decoding capability in a receiving station side;
• interleaving all signals with each amplified signal collected into one channel;
• transmitting a transmission signal obtained by the interleaving via the one channel;
• and
• monitoring propagation path conditions such as traffic conditions at certain intervals, wherein said power amplification updates an amplitude value of each code with reference to a number of interference signals satisfying predetermined criteria, defining considerable interference signals,updated number of code words for one frame, and noise power according to said propagation path conditions.

A receiving apparatus, comprising:

• receiving means for receiving a transmission signal from at least two sending stations each corresponding to a user, and, each employing a different interleave method, the transmission signal obtained by encoding each frame resulting from segmentation of transmission information, power amplifying each encoded signal with a different amplitude, and interleaving all signals with each amplitude signal collected into one channel, and by monitoring propagation path conditions such as traffic conditions at certain intervals to update an amplitude value of each code with reference to a number of interference signals satisfying predetermined criteria, defining considerable interference signals, updated number of code words for one frame, and noise power according to said propagation path conditions,
• de-interleaving means of de-interleaving said transmission signal from the at least two sending stations in correspondence to each different interleave method;
• decoding means of successively decoding codes of the signal in descending order of Signal-to-Interference and Noise power Ratio;
• and
• signal canceling means of re-encoding the decoded signal to successively cancel the re-encoded signal from said transmission signal.

A receiving method, comprising:

• receiving a transmission signal from at least two sending stations each corresponding to a user, and each employing a different interleave method, the transmission signal obtained by encoding each frame resulting from segmentation of transmission information, power amplifying each encoded signal with a different amplitude, and interleaving all signals with each amplitude signal collected into one channel, and by
• monitoring propagation path conditions such as traffic conditions at certain intervals to update an amplitude value of each code with reference to a number of interference signals satisfying predetermined criteria, defining considerable interference signals, updated number of code words for one frame, and noise power according to said propagation path conditions
• de-interleaving said transmission signal from the at least two sending stations in correspondence to each different interleave method;
• successively decoding codes of the signal in order of Signal to Interference and Noise power Ratio;
• and
• re-encoding the decoded signal to successively cancel of the re-encoded signal from said transmission signal.

An unbalance code mixing method for carrying out an unbalance code mixing of information transmitted using a non-spread spectrum system, comprising:

• segmenting transmission information into a plurality of frames;
• encoding each frame;
• power amplifying each encoded signal with a different amplitude said amplification changes a rate of amplitude amplification for each frame according to a decoding capability in a receiving station side;
• and
• interleaving all signals with each amplified signal collected into one channel,
• wherein said power amplification updates an amplitude value of each code with reference to a number of interference signals satisfying predetermined criteria, defining considerable interference signals, updated number of code words for one frame, and noise power according to said propagation path conditions.

A decoding method, comprising:

• decoding a transmitting signal from at least two sending stations each corresponding to a user, and each employing a different interleave method, the transmission signal obtained by encoding each frame resulting from segmentation of transmission information, power amplifying each encoded signal with a different amplitude, and interleaving all signals with each amplitude signal collected into one channel, and
• monitoring propagation path conditions such as traffic conditions at certain intervals to update an amplitude value of each code with reference to a number of interference signals satisfying predetermined criteria, defining considerable interference signals, updated number of code words for one frame, and noise power according to said propagation path conditions,
• de-interleaving said transmission signal from the at least two sending stations in correspondence to each different interleave method;
• decoding successively codes of the signal in descending order of Signal-to-Interference and Noise power Ratio;
• and
• re-encoding the decoded signal to successively cancel the re-encoded signal from said transmission signal.