TDMA communications system with adaptive equalization

A time division multiple access (TDMA) communication receiving station for receiving a transmitted TDMA signal having a first user message time-multiplexed with at least one other user message, said first user message having a plurality of first predetermined synchronization words interleaved with a plurality of first data words, said receiving station comprising:

• means for receiving said transmitted TDMA signal;
• means for de-multiplexing said first user message from said other user message of said received TDMA signal, thereby generating a TDMA control signal;
• and
• means for equalizing the time delay spread characteristics of the first user message data word portions of said received TDMA signal in response to said TDMA control signal at least the first time the plurality of predetermined synchronization word portions of said first user message are received.

A method of reducing the multipath interference distortion in a time division multiple access (TDMA) communication system comprising the steps of:

• interleaving a plurality of first predetermined synchronization words with a plurality of first data words to form a first user message;
• multiplexing said first user message with at least one other user message to form a TDMA signal;
• transmitting said TDMA signal from a transmitting station;
• receiving said transmitted TDMA signal in a receiving station;
• de-multiplexing said first user message from said other user message of said received TDMA signal, thereby generating a TDMA control signal;
• and
• equalizing the time delay spread characteristics of the first user message data word portions of said received TMA signal in response to said TDMA control signal at least the first time the plurality of predetermined synchronization word portions of said first user message are received.

A time division multiple access (TDMA) communication system comprising:

• a transmitting station including
• means for formatting a first predetermined synchronization word with a first data word to form a first user message;
• means for multiplexing said first user message with at least one other user message to form a TDMA signal;
• means for transmitting said TDMA signal;
• and a receiving station including
• means for receiving said transmitted TDMA signal;
• means for de-multiplexing said first user message from said other user message of said received TDMA signal;
• thereby generating a TDMA control signal;
• means for storing the first user message portion of said received TDMA signal in response to said TDMA control signal;
• and
• means for equalizing the time delay spread characteristics of the data word portion of said stored user message at least during the time subsequent to receiving said first user message portion of said transmitted TDMA signal.

A time division multiple access (TDMA) communication receiving station for receiving a transmitted TDMA signal having a first user message time-multiplexed with at least one other user message, said first user message having a first predetermined synchronization word formatted with a first data word, said receiving station comprising:

• means for receiving said transmitted TDMA signal;
• means for de-multiplexing said first user message from said other user message of said received TDMA signal, thereby generating a TDMA control signal;
• means for storing the first user message portion of said received TDMA signal in response to said TDMA control signal;
• and
• means for equalizing the time delay spread characteristics of the data word portion of said stored user message at least during the time subsequent to receiving said first user message portion of said transmitted TDMA signal.

An equalization circuit for reducing the multipath interference distortion in a time division multiple access (TDMA) communication receiving station adapted to receive a transmitted TDMA signal having a first user message time-multiplexed with at least one other user message, said first user message having a first predetermined synchronization word formatted with a first data word, said equalization circuit comprising:

• means for de-multiplexing said first user message from said other user message of said received TDMA signal, thereby generating a TDMA control signal;
• means for storing the first user message portion of said received TDMA signal in response to said TDMA control signal;
• and
• means for equalizing the time delay spread characteristics of the data word portion of said stored user message at least during the time subsequent to receiving said first user message portion of said transmitted TDMA signal.

A method of reducing the multipath interference distortion in a time division multiple access (TDMA) communication system comprising the steps of:

• formatting a first predetermined synchronization word with a first data word to form a first user message;
• multiplexing said first user message with at least one other user message to form a TDMA signal;
• transmitting said TDMA signal from a transmitting station;
• receiving said transmitted TDMA signal in a receiving station;
• de-multiplexing said first user from said other user message of said received TDMA signal, thereby generating a TDMA control signal;
• storing the first user message portion of said received TDMA signal in response to said TDMA control signal;
• and
• equalizing the time delay spread characteristics of the data word portion of said stored user message at least during the time subsequent to receiving said first user message portion of said transmitted TDMA signal.

A method of reducing the multipath interference distortion in a time division multiple access (TDMA) communication receiving station adapted to receive a transmitted TDMA signal having a first user message time-multiplexed with at least one other user message, said first user message having a first predetermined synchronization word formatted with a first data word, said method comprising the steps of:

• de-multiplexing said first user from said other user message of said received TDMA signal, thereby generating a TDMA control signal;
• storing the first user message portion of said received TDMA signal in response to said TDMA control signal;
• and
• equalizing the time delay spread characteristics of the data word portion of said stored user message at least during the time subsequent to receiving said first user message portion of said transmitted TDMA signal.

A method of reducing the multipath interference distortion in a time division multiple access (TDMA) communication system comprising the steps of:

• interleaving a plurality of first predetermined synchronization words with a plurality of first data words to form a first user message;
• multiplexing said first user message with at least one other user message to form a TDMA signal;
• transmitting said TDMA signal from a transmitting station;
• receiving said transmitted TDMA signal in a receiving station;
• de-multiplexing said first user message from said other user message of said received TDMA signal, thereby generating a TDMA control signal;
• adapting the time delay spread parameters of an equalizing means in response to the reception of each of said first predetermined synchronization word portions of said de-multiplexed first user message;
• and
• equalizing the time delay spread characteristics of the first user message data word portion of said received TDMA signal in response to said TDMA control signal.

A method of reducing the multipath interference distortion in a time division multiple access (TDMA) communication system comprising the steps of:

• formatting a first predetermined synchronization word with a first data word to form a first user message;
• multiplexing said first user message with at least one other user message to form a TDMA signal;
• transmitting said TDMA signal from a transmitting station;
• receiving said transmitted TDMA signal in a receiving station;
• de-multiplexing said first user from said other user message of said received TDMA signal, thereby generating a TDMA control signal;
• storing the first user message portion of said received TDMA signal in response to said TDMA control signal;
• adapting the time delay spread parameters of an equalizing means in response to the reception of each of said first predetermined synchronization word portions of said de-multiplexed first user message;
• and
• equalizing the time delay spread characteristics of the data word portion of said stored user message in response to said TDMA control signal at least during the time subsequent to receiving said first user message portion of said transmitted TDMA signal.