TDMA communications system with adaptive equalization
First Claim
1. A time division multiple access (TDMA) communication system comprising:
- a transmitting station includingmeans for interleaving a plurality of first predetermined synchronization words with a plurality of first data words 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 includingmeans 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.
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Abstract
A method and means for reducing multipath interference distortion in a time-division multiple access (TDMA) communications system is disclosed. A transmitting station (100) formats one or more equalizer synchronization words with a first user'"'"'s data word, time-multiplexes this formatted user message with at least one other user message, and transmits the combined signal. The receiving station (200) receives the transmitted TDMA signal, de-multiplexes the first user message from the other user messages, and equalizes the time delay spread characteristics of the data word portion of the first user message (or a stored version of such) in response to this de-multiplexing. Performing the adaptive equalization process more than once per user time slot provides an even higher data throughout for the system. Storing the first user message in a data buffer permits the adaptive equalization process to be performed in non-real time, thereby lowering the required signal processing data rate in any particular receiver.
217 Citations
28 Claims
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1. A time division multiple access (TDMA) communication system comprising:
a transmitting station including means for interleaving a plurality of first predetermined synchronization words with a plurality of first data words 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 includingmeans 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. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. 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:
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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.
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9. 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 plurality of first predetermined synchronization words interleaved with a plurality of first data words, said equalization circuit comprising:
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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.
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10. A method of reducing the multipath interference distortion in a time division multiple access (TDMA) communication system comprising the steps of:
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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.
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11. 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 plurality of first predetermined synchronization words interleaved with a plurality of first data words, said method comprising the steps of:
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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 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.
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12. 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 includingmeans 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. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. 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:
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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.
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24. 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:
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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.
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25. A method of reducing the multipath interference distortion in a time division multiple access (TDMA) communication system comprising the steps of:
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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.
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26. 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:
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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.
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27. A method of reducing the multipath interference distortion in a time division multiple access (TDMA) communication system comprising the steps of:
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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.
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28. A method of reducing the multipath interference distortion in a time division multiple access (TDMA) communication system comprising the steps of:
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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.
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Specification