Phase Modulation multiplexing transmission unit and phase modulation multiplexing method

Abstract

In the phase modulation multiplexing transmission unit 1, a digital input signal is divided by a signal division unit, each of the resultant division signal is output to multiplication units 3 a and 3 b, respectively. The multiplication units 3 a and 3 b multiply the division signals by spread code signals output from spread code generators 2 a and 2 b, respectively. A multiplication signal Sb output from the multiplication unit 3 b is shifted by π/2 radian through a phase shifter 4, which is added to a multiplexing signal Sa output from the multiplication unit 3 a through an adder 5. A synthetic signal Se(n) output from the adder 5 is BPSK modulated through a modulator 6, which is transmitted through a transmission amplifier 7 and an antenna 8.

What is claimed is:  
     
         1 . A phase modulation multiplexing transmission unit comprising: 
 multiplication means for outputting a plurality of multiplication signals derived from multiplying a plurality of division signals obtained by dividing a digital input signal by a plurality of spread code signals;    phase shifting means for turning a phase so that each of said plurality of multiplication signals has a phase difference;    addition means for outputting a multiplexing signal by summing said plurality of multiplication signals each having a phase difference; and    modulation means for modulating said multiplexing signal for outputting.    
     
     
         2 . The phase modulation multiplexing transmission unit of    claim 1   , wherein said modulation means phase modulates said multiplexing signal.  
     
     
         3 . The phase modulation multiplexing transmission unit of    claim 1    comprises signal division means for dividing a digital input signal and a plurality of spread code generation means for generating spread code signals for spectrum spreading.  
     
     
         4 . The phase modulation multiplexing transmission unit of    claim 1    further comprises radio transmission means for radio transmitting a modulation signal output from said modulation means.  
     
     
         5 . A phase modulation multiplexing transmission unit comprising: 
 signal division means for dividing a digital input signal;    a plurality of spread code generation means for generating spread code signals for spectrum spreading;    a plurality of multiplication means for outputting multiplication signals by multiplying an output signal divided by said signal division means by said spread code signal;    phase shifting means for turning a phase of at least 1 multiplication signal or more output from said plurality of multiplication means so that each of said plurality of multiplication signals has a phase difference;    addition means for generating a multiplexing signal by summing multiplication signals each having a phase difference; and    modulation means for modulating a multiplexing signal from said addition means for outputting.    
     
     
         6 . The phase modulation multiplexing transmission unit of    claim 5   , wherein said modulation means phase modulates said multiplexing signal.  
     
     
         7 . The phase modulation multiplexing transmission unit of    claim 6    comprises radio transmission means for radio transmitting a modulation signal output from said modulation means.  
     
     
         8 . The phase modulation multiplexing transmission unit of    claim 5   , wherein said addition means sums a multiplication signal output from said multiplication means and a signal with its phase turned through said phase shifting means.  
     
     
         9 . The phase modulation multiplexing transmission unit of    claim 5   , wherein said addition means sums all output signals output from said phase shifting means when each phase of all multiplication signals has been turned.  
     
     
         10 . A phase modulation multiplexing method comprising steps of: 
 generating a plurality of multiplication signals by multiplying a plurality of division signals obtained by dividing a digital input signal by a plurality of spread code signals;    turning a phase so that each of said plurality of multiplication signals has a phase difference;    generating a multiplexing signal by summing a plurality of multiplication signals each having a phase difference; and    modulating said multiplexing signal.    
     
     
         11 . The phase modulation multiplexing method of    claim 10   , wherein said modulating step comprising a step of phase modulating said multiplexing signal.  
     
     
         12 . The phase modulation multiplexing method of    claim 10    further comprises a step of dividing a digital input signal and a step of generating a plurality of spread code signals for spectrum spreading.  
     
     
         13 . The phase modulation multiplexing method of    claim 10    further comprises a step of radio transmitting said modulation signal.