Matched filter for scalable spread spectrum communications systems
First Claim
1. A spread spectrum communications system, comprising:
- (A) a transmitter, said transmitter further comprising;
(1) a data source;
(2) a first multiplier/mixer spreading data from said data source with a first pseudo noise source;
(3) a second multiplier/mixer spreading data from said first mixer with a second pseudo noise source;
(4) an RE transmitter;
(B) a receiver, said receiver further comprising;
(1) an RE receiver;
(2) a first matched filter receiving data from said RE receiver;
(3) a plurality of phase/frequency shifters, receiving a signal from said first matched filter;
(4) a plurality of second matched filters receiving data from said plurality of phase/frequency shifters; and
(5) an equalizer/decoder receiving signals from said plurality of phase/frequency shifters.
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Accused Products
Abstract
A spread spectrum communications system uses long, scalable PN sequences to achieve variable communication rates. A low-complexity and scalable matched filter architecture is used to provide a large processing gain and robust recovery of multiple devices in long reach, high ambient-noise environments. The spread spectrum communications system includes a transmitter and a receiver. The receiver includes an RF receiver and a first matched filter receiving data from the RF receiver. A plurality of phase/frequency shifters receives a signal from the first matched filter. A plurality of second matched filters receive data from the plurality of phase/frequency shifters. An equalizer/decoder receives signals from the plurality of phase/frequency shifters.
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Citations
10 Claims
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1. A spread spectrum communications system, comprising:
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(A) a transmitter, said transmitter further comprising; (1) a data source; (2) a first multiplier/mixer spreading data from said data source with a first pseudo noise source; (3) a second multiplier/mixer spreading data from said first mixer with a second pseudo noise source; (4) an RE transmitter; (B) a receiver, said receiver further comprising; (1) an RE receiver; (2) a first matched filter receiving data from said RE receiver; (3) a plurality of phase/frequency shifters, receiving a signal from said first matched filter; (4) a plurality of second matched filters receiving data from said plurality of phase/frequency shifters; and (5) an equalizer/decoder receiving signals from said plurality of phase/frequency shifters. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification