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US 5,966,377 AGranted
Spread spectrum communication system
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorHideshi Murai
Life of this patent
Estimating the term…
Abstract
Low rate data and middle rate data are time division multiplexed independently according to their rates by a time division multiplexer so that their rates match the rate of high rate data which are not passed through the time division multiplexer. Subsequently, the entire data are converted into biorthogonal signals by biorthogonal signal generators (BORTs), and code division multiplexed by a code division multiplexer. The code division multiplexed signal undergoes modulation by a spreading modulator and a carrier modulator, and transmitted.
Claims47
A spread spectrum communication system comprising:
- first time division multiplexing means for time division multiplexing low rate data and middle rate data;
- biorthogonal signal generating means for converting into biorthogonal signals time division multiplexed data and high rate data which have not been time division multiplexed;
- first code division multiplexing means for code division multiplexing said biorthogonal signals;
- spreading modulation means for performing spreading modulation of a multiplexed signal obtained by said first code division multiplexing means using a spreading code sequence;
- and
- carrier modulation means for performing carrier modulation by using a spreading modulated signal by said spreading modulation means.
3 more elements
A spread spectrum communication system comprising:
- second code division multiplexing means for code division multiplexing low rate data;
- time division multiplexing means for time division multiplexing middle rate data;
- biorthogonal signal generating means for converting time division multiplexed data and high rate data into biorthogonal signals;
- first code division multiplexing means for code division multiplexing the code division multiplexed signal and the biorthogonal signals;
- spreading modulation means for performing spreading modulation, by using a spreading code sequence, of a multiplexed signal obtained by said first code division multiplexing means;
- and
- carrier modulation means for performing carrier modulation by using a spreading modulated signal from said spreading modulation means.
4 more elements
A spread spectrum communication system comprising:
- time division multiplexing means for time division multiplexing low rate data and middle rate data independently in accordance with their rates;
- second code division multiplexing means for code division multiplexing the time division multiplexed low rate data;
- biorthogonal signal generating means for converting into biorthogonal signals the time division multiplexed middle rate data and high rate data which have not been time division multiplexed;
- first code division multiplexing means for code division multiplexing the code division multiplexed signals and said biorthogonal signals;
- spreading modulation means for performing spreading modulation, by using a spreading code sequence, of a multiplexed signal obtained from said first code division multiplexing means;
- and
- carrier modulation means for performing carrier modulation by using a spreading modulated signal from said spreading modulation means.
4 more elements
A spread spectrum communication method comprising the steps of:
- time division multiplexing low rate data and middle rate data;
- converting into biorthogonal signals the time division multiplexed data and high rate data which have not been time division multiplexed;
- code division multiplexing the biorthogonal signals;
- performing spreading modulation of a multiplexed signal obtained by said code division multiplexing step using a spreading code sequence;
- and
- performing carrier modulation by using a spreading modulated signal from said spreading modulation step.
3 more elements
A spread spectrum communication method comprising the steps of:
- a second code division multiplexing step for code division multiplexing low rate data and outputting a code division multiplexed signal;
- time division multiplexing middle rate data;
- converting time division multiplexed data and high rate data into biorthogonal signals;
- a first code division multiplexing step for code division multiplexing the code division multiplexed signal and the biorthogonal signals;
- performing spreading modulation, by using a spreading code sequence, of a multiplexed signal obtained from said first code division multiplexing step;
- and
- performing carrier modulation by using a spreading modulated signal from said spreading modulation step.
4 more elements
A spread spectrum communication method comprising the steps of:
- time division multiplexing low rate data and middle rate data independently in accordance with their rates;
- a second code division multiplexing step for code division multiplexing the time division multiplexed low rate data;
- converting into biorthogonal signals time division multiplexed middle rate data and high rate data which have not been time division multiplexed;
- first code division multiplexing step for code division multiplexing the code division multiplexed signals and the biorthogonal signals;
- performing spreading modulation, by using a spreading code sequence, of a multiplexed signal obtained from said first code division multiplexing step;
- and
- performing carrier modulation by using a spreading modulated signal from said spreading modulation step.
4 more elements
A spread spectrum communication system comprising:
- a first time division multiplexer connected to low and middle rate data input ports, said first time division multiplexer outputting time division multiplexed low and middle rate data;
- a first biorthogonal signal generator connected to said first time division multiplexer so as to receive the time division multiplexed low and middle rate data, said first biorthogonal signal generator outputting first biorthogonal signals;
- a second biorthogonal signal generator connected to high rate data input ports, said second biorthogonal signal generator outputting second biorthogonal signals;
- a first code division multiplexer connected to said first biorthogonal signal generator and said second biorthogonal signal generator;
- a spreading modulator connected to said first code division multiplexer;
- and
- a carrier modulator connected to said spreading modulator.
4 more elements
A spread spectrum communication system comprising:
- a second code division multiplexer connected to low data rate input ports, said first code division multiplexer outputting code division multiplexed low rate data;
- a time division multiplexer connected to middle data rate input ports, said time division multiplexer outputting time division multiplexed middle rate data;
- a first biorthogonal signal generator connected to said time division multiplexer;
- a second biorthogonal signal generator connected to high data rate input ports;
- a first code division multiplexer connected to said second code division multiplexer and to said first and second biorthogonal signal generators;
- a spreading modulator connected to said first code division multiplexer;
- and
- a carrier modulator connected to said spreading modulator.
5 more elements
A spread spectrum communication system comprising:
- a time division multiplexer connected to low and middle rate data input ports;
- a second code division multiplexer connected to said time division multiplexer and receiving the time division multiplexed low rate data;
- a first biorthogonal signal generator connected to said time division multiplexer and receiving the time division multiplexed middle rate data;
- a second biorthogonal signal generator connected to high rate data input ports:
- a first code division multiplexer connected to said second code division multiplexer and to said first and second biorthogonal signal generators;
- a spreading modulator connected to said first code division multiplexer;
- and
- a carrier modulator connected to said spreading modulator.
5 more elements
Dependencies are inferred from the claim text.