Receiver for spread spectrum communication

A receiver for spread spectrum communication for decoding into information by first and second correlation outputs, comprising:

• reference signal generating means for generating first and second reference signals, each of which is a 4-phase-modulated signal formed on the basis of a first PN code, a second PN code and a first CW signal;
• a first convolver for producing the first correlation output from a received spread spectrum signal and the first reference signal which are respectively applied to first and second inputs thereof;
• and
• a second convolver for producing the second correlation output from the received spread spectrum signal and the second reference signal which are respectively applied to first and second inputs thereof;
• wherein said reference signal generating means includes a first multiplier for multiplying said first PN code and said first CW signal, a second multiplier for multiplying said second PN code and a second CW signal whose phase is shifted by 90.degree. or -90.degree. with respect to said first CW signal, a third multiplier for multiplying said second PN code and a third CW signal whose phase is shifted by 180.degree. or -180.degree. with respect to said second CW signal, a first adder for adding the output of said first multiplier and that of said second multiplier, and a second adder for adding the output of said first multiplier and that of said third multiplier, the outputs of said first and said second adders being said first and said second reference signals, respectively.

A receiver for spread spectrum communication for decoding into information by first and second correlation outputs, comprising:

• reference signal generating means for generating first and second reference signals, each of which is a 4-phase-modulated signal formed on the basis of a first PN code, a second PN code and a first CW signal;
• a first convolver for producing the first correlation output from a received spread spectrum signal and the first reference signal which are respectively applied to first and second inputs thereof;
• and
• a second convolver for producing the second correlation output from the received spread spectrum signal and the second reference signal which are respectively applied to first and second inputs thereof;
• wherein said reference signal generating means includes a first multiplier for multiplying said first PN code and said first CW signal, a second multiplier for multiplying said second PN code and said first CW signal, first and second delaying means for delaying the output of said second multiplier, a first adder for adding the output of said first multiplier and that of said first delaying means, and a second adder for adding the output of said first multiplier and that of said second delaying means, the outputs of said first and said second adders being said first and said second reference signals, respectively.

A receiver for spread spectrum communication, comprising:

• a first convolver having first and second inputs and an output;
• a second convolver having first and second inputs and an output;
• reference signal generating means for generating a first reference signal PN.sub.1 (t).multidot.cos (.omega..sub.o t+.psi.)+PN.sub.2 (t).multidot.sin (.omega..sub.o t+.psi.) and a second reference signal PN.sub.1 (t).multidot.cos (.omega..sub.o t+.psi.)-PN.sub.2 (t).multidot.sin (.omega..sub.o t+.psi.), where PN.sub.1 (t) is a first pseudo-noise code, PN.sub.2 (t) is a second pseudo-noise code, and .omega..sub.o and .phi. are respectively the frequency of a first CW signal and a phase;
• first means for supplying a received spread spectrum signal to said first input of each of said first and second convolvers;
• and
• second means for supplying each of said first and second reference signals to the second input of a respective one of said first and second convolvers.