초록 ▼

A technique for modulating and demodulating CPM spread spectrum signals and variations of CPM spread spectrum signals uses a set of codes or multiple sets of codes that reduce cross-correlation interference. A transmitter divides a signal data stream into I and Q data streams, independently modulate

A technique for modulating and demodulating CPM spread spectrum signals and variations of CPM spread spectrum signals uses a set of codes or multiple sets of codes that reduce cross-correlation interference. A transmitter divides a signal data stream into I and Q data streams, independently modulates the I and Q data streams using CPM or a related technique, and superposes the plurality of resultants for transmission. A receiver receives the superposed spread spectrum signal, simultaneously attempts to correlate for I and Q chip sequences, and interleaves the correlated I and Q data streams into a unified signal data stream. In one embodiment the receiver separates the received spread spectrum signal into real and imaginary parts, attempts to correlate both real and imaginary parts for a plurality of chip sequences, and combines separate correlation signals into a unified signal data stream. In other embodiments single-bit or multi-bit digitization of the received spread spectrum signal is carried out prior to correlation. In another embodiment the transmitter differentially phase encodes the information to be transmitted, and the receiver decodes the phase-encoded information.

대표청구항 ▼

[ What is claimed is:] [1.]1. A communication system comprising a spread spectrum transmitter and a spread spectrum receiver, said spread spectrum transmitter and said spread spectrum receiver communicating using a set of spread spectrum codes selected from seven sets of codes for minimizing cross-c

[ What is claimed is:] [1.]1. A communication system comprising a spread spectrum transmitter and a spread spectrum receiver, said spread spectrum transmitter and said spread spectrum receiver communicating using a set of spread spectrum codes selected from seven sets of codes for minimizing cross-correlation interference in spread spectrum communication, wherein:a first set of the seven sets of codes comprises:01111010100010011100000110010110; 00101111110111001001010011000011; 01001001101110101111001010100101; 00011100111011111010011111110000; 01110101100001101100111010011001; 00100000110100111001101111001100; 01000110101101011111110110101010; 00010011111000001010100011111111; 01111010011101101100000101101001; 00101111001000111001010000111100; 01001001010001011111001001011010; 00011100000100001010011100001111; 01110101011110011100111001100110; 00100000001011001001101100110011; 01000110010010101111110101010101; 00010011000111111010100000000000; 01111010100010010011111001101001; 00101111110111000110101100111100; 01001001101110100000110101011010; 00011100111011110101100000001111; 01110101100001100011000101100110; 00100000110100110110010000110011; 01000110101101010000001001010101; 00010011111000000101011100000000; 01111010011101100011111010010110; 00101111001000110110101111000011; 01001001010001010000110110100101; 00011100000100000101100011110000; 01110101011110010011000110011001; 00100000001011000110010011001100; 01000110010010100000001010101010; and 00010011000111110101011111111111;a second set of the seven sets of codes comprises:11111100110001100111100100111011; 11111100110001100111100100111011; 10101001100100110010110001101110; 11001111111101010100101000001000; 10011010101000000001111101011101; 11110011110010010111011000110100; 10100110100111000010001101100001; 11000000111110100100010100000111; 10010101101011110001000001010010; 11111100001110010111100111000100; 10101001011011000010110010010001; 11001111000010100100101011110111; 10011010010111110001111110100010; 11110011001101100111011011001011; 10100110011000110010001110011110; 11000000000001010100010111111000; 10010101010100000001000010101101; 11111100110001101000011011000100; 10101001100100111101001110010001; 11001111111101011011010111110111; 10011010101000001110000010100010; 11110011110010011000100111001011; 10100110100111001101110010011110; 11000000111110101011101011111000; 10010101101011111110111110101101; 11111100001110011000011000111011; 10101001011011001101001101101110; 11001111000010101011010100001000; 10011010010111111110000001011101; 11110011001101101000100100110100; 10100110011000111101110001100001; 11000000000001011011101000000111; and 10010101010100001110111101010010;a third set of the seven sets of codes comprises:10010100101000101000001010110001; 11000001111101111101011111100100; 10100111100100011011000110000010; 11110010110001001110010011010111; 10011011101011011000110110111110; 11001110111110001101100011101011; 10101000100111101011111010001101; 11111101110010111110101111011000; 10010100010111011000001001001110; 11000001000010001101011100011011; 10100111011011101011000101111101; 11110010001110111110010000101000; 10011011010100101000110101000001; 11001110000001111101100000010100; 10101000011000011011111001110010; 11111101001101001110101100100111; 10010100101000100111110101001110; 11000001111101110010100000011011; 10100111100100010100111001111101; 11110010110001000001101100101000; 10011011101011010111001001000001; 11001110111110000010011100010100; 10101000100111100100000101110010; 11111101110010110001010000100111; 10010100010111010111110110110001; 11000001000010000010100011100100; 10100111011011100100111010000010; 11110010001110110001101111010111; 10011011010100100111001010111110; 11001110000001110010011111101011; 10101000011000010100000110001101; and 11111101001101000001010011011000;a fourth set of the seven sets of codes comprises:11000010001001001100110100001001; 10010111011100011001100001011100; 11110001000101111111111000111010; 10100100010000101010101101101111; 11001101001010111100001000000110; 10011000011111101001011101010011; 11111110000110001111000100110101; 10101011010011011010010001100000; 11000010110110111100110111110110; 10010111100011101001100010100011; 11110001111010001111111011000101; 10100100101111011010101110010000; 11001101110101001100001011111001; 10011000100000011001011110101100; 11111110111001111111000111001010; 10101011101100101010010010011111; 11000010001001000011001011110110; 10010111011100010110011110100011; 11110001000101110000000111000101; 10100100010000100101010010010000; 11001101001010110011110111111001; 10011000011111100110100010101100; 11111110000110000000111011001010; 10101011010011010101101110011111; 11000010110110110011001000001001; 10010111100011100110011101011100; 11110001111010000000000100111010; 10100100101111010101010001101111; 11001101110101000011110100000110; 10011000100000010110100001010011; 11111110111001110000111000110101; and 10101011101100100101101101100000;a fifth set of the seven sets of codes comprises:10111111111000011010010101101100; 11101010101101001111000000111001; 10001100110100101001011001011111; 11011001100001111100001100001010; 10110000111011101010101001100011; 11100101101110111111111100110110; 10000011110111011001100101010000; 11010110100010001100110000000101; 10111111000111101010010110010011; 11101010010010111111000011000110; 10001100001011011001011010100000; 11011001011110001100001111110101; 10110000000100011010101010011100; 11100101010001001111111111001001; 10000011001000101001100110101111; 11010110011101111100110011111010; 10111111111000010101101010010011; 11101010101101000000111111000110; 10001100110100100110100110100000; 11011001100001110011110011110101; 10110000111011100101010110011100; 11100101101110110000000011001001; 10000011110111010110011010101111; 11010110100010000011001111111010; 10001100001011010110100101011111; 11011001011110000011110000001010; 10110000000100010101010101100011; 11100101010001000000000000110110; 10000011001000100110011001010000; and 11010110011101110011001100000101;a sixth set of the seven sets of codes comprises:11011011000110100010111110111100; 10001110010011110111101011101001; 11101000001010010001110010001111; 10111101011111000100100111011010; 11010100000101010010000010110011; 10000001010000000111010111100110; 11100111001001100001001110000000; 10110010011100110100011011010101; 11011011111001010010111101000011; 10001110101100000111101000010110; 11101000110101100001110001110000; 10111101100000110100100100100101; 11010100111010100010000001001100; 10000001101111110111010100011001; 11100111110110010001001101111111; 10110010100011000100011000101010; 11011011000110101101000001000011; 10001110010011111000010100010110; 11101000001010011110001101110000; 10111101011111001011011000100101; 11010100000101011101111101001100; 10000001010000001000101000011001; 11100111001001101110110001111111; 10110010011100111011100100101010; 11011011111001011101000010111100; 10001110101100001000010111101001; 11101000110101101110001110001111; 10111101100000111011011011011010; 11010100111010101101111110110011; 10000001101111111000101011100110; 11100111110110011110110010000000; and 10110010100011001011100111010101; anda seventh set of the seven sets of codes comprises:0011100110101110111000001; 01101100111110110100100010010100; 00001010100111010010111011110010; 01011111110010000111101110100111; 00110110101000010001001011001110; 01100011111101000100011110011011; 00000101100100100010000111111101; 01010000110001110111010010101000; 00111001010100010001110100111110; 01101100000001000100100001101011; 00001010011000100010111000001101; 01011111001101110111101101011000; 00110110010111100001001000110001; 01100011000010110100011101100100; 00000101011011010010000100000010; 01010000001110000111010001010111; 00111001101011101110001000111110; 01101100111110111011011101101011; 00001010100111011101000100001101; 01011111110010001000010001011000; 00110110101000011110110100110001; 01100011111101001011100001100100; 00000101100100101101111000000010; 01010000110001111000101101010111; 00111001010100011110001011000001; 01101100000001001011011110010100; 00001010011000101101000111110010; 01011111001101111000010010100111; 00110110010111101110110111001110; 01100011000010111011100010011011; 00000101011011011101111011111101; and 01010000001110001000101110101000; selectively transmitting and receiving said set of codes by said transmitter and receiver respectively.