Source coding for interference reduction

A method for reducing multiple access interference at a receiver, the method comprising:

• receiving at a multiple access receiver a modulated signal having multiple transmitted signals thereon wherein each transmitted signal is encoded using low energy encoding;
• identifying a transmitted signal according to a unique identifying pattern within the signal;
• and
• decoding a transmitted signal using low energy decoding.

A method for determining codeword length for a low energy coded system in order reduce an error probability of receiving a complete codeword, the method comprising:

• determining a signal to noise ratio for a low energy encoded frequency;
• obtaining a length for binary encoded signal based upon a known number of symbols;
• determining a critical length based upon the length of the binary encoded signal and the determined signal to noise ratio;
• and
• setting the codeword length for low energy encoding to a length that is less than or equal to the critical length.

A method for determining a codeword length for low energy encoding of a data source for transmission in a code division multiple access system, the method comprising:

• receiving a bit energy to noise ratio for the system;
• providing a number of total symbols in the data source;
• providing a number of transmissions for a given frequency;
• determining a critical length based upon the selected bit energy to noise ratio, the number of words in the data source, and the number of transmissions for a given frequency;
• and
• selecting a codeword that is less than the critical length.

A system for transmitting transmission signals, the system including:

• a low energy data source encoder for encoding a data source into codewords using low energy encoding;
• a pseudo-random pattern generator wherein each pseudorandom generator adds a pseudorandom signal to the codewords for the data source forming a transmission signal;
• and
• a modulator for modulating each transmission signal on a carrier frequency.

A receiver for receiving a code division multiple access signal, the receiver comprising:

• a demodulator for removing the carrier frequency from the code division multiple access signal;
• pseudo-random module for separating each low energy encoded signal from the code division multiple access signal;
• and
• a low energy decoder for decoding each low energy encoded signal.

A computer program product for use with a computer processor for encoding a transmission signal to reduce multiple access interference at a receiver, the computer program product having computer code thereon, the computer code comprising:

• computer code for receiving a data source signal including a plurality of source symbols;
• computer code for encoding the source symbols using low energy encoding forming encoded codewords;
• and
• computer code for applying pseudo-random pattern to the encoded codewords forming a transmission signal.

A computer program product for use with a computer processor for reducing multiple access interference at a receiver, the computer program product having computer code thereon, the computer code comprising:

• computer code for receiving a modulated signal having multiple transmitted signals thereon wherein each transmitted signal is encoded using low energy encoding;
• computer code for identifying each transmitted signal according to a unique pseudorandom number within the signal;
• and
• computer code for decoding each transmitted signal using low energy decoding.

A computer program product for use with a computer processor for determining codeword length for a low energy coded system in order reduce an error probability of receiving a complete codeword, the computer program product having computer code thereon, the computer code comprising:

• computer code for determining a signal to noise ratio for a low energy encoded frequency;
• computer code for obtaining a length for binary encoded signal based upon a known number of symbols;
• computer code for determining a critical length based upon the length of the binary encoded signal and the determined signal to noise ratio;
• and
• computer code for setting the codeword length for low energy encoding to a length that is less than or equal to the critical length.

A computer program product for use with a computer processor for determining a codeword length for low energy encoding of a data source for transmission in a code division multiple access system, the computer program product having computer code thereon, the computer code comprising:

• computer code for receiving a bit energy to noise ratio for the system;
• computer code for receiving a number of source symbols in the data source;
• computer code for receiving a number of transmissions for a given frequency;
• computer code for determining a critical length based upon the selected bit energy to noise ratio, the number of words in the data source, and the number of transmissions for a given frequency;
• and
• computer code for selecting a codeword length that is less than the critical length.