Base station apparatus of mobile communication system

Abstract

A spreading and/or despreading mechanism in which the inphase component and a quadrature component of a signal are to be transmitted by using a short code and a long code. The long code has an inphase component and a quadrature component that are different from each other. The spreading and despreading operations carry out a complex-to-complex operation between a combination of the inphase component and the quadrature component of the signal and a combination of the inphase component and the quadrature component of the long code.

1 . A transmission apparatus comprising: 
 spreading means for spreading an inphase component and a quadrature component of a signal to be transmitted by using a short code and a long code, the long code having an inphase component and a quadrature component that are different from each other, wherein the spreading means is further for carrying out a complex-to-complex operation between a combination of the inphase component and the quadrature component of the signal and a combination of the inphase component and the quadrature component of the long code; and    transmission means for transmitting the signal whose inphase component and quadrature component have been spread.    
   
   
       2 . The transmission apparatus as claimed in  claim 1 , wherein the spreading means spreads the inphase component and the quadrature component of the signal by using a same short code for the inphase component and the quadrature component of the signal.  
   
   
       3 . The transmission apparatus as claimed in  claim 2 , wherein the complex-to-complex operation is a complex-to-complex multiplication.  
   
   
       4 . The transmission apparatus as claimed in  claim 1 , wherein the complex-to-complex operation is a complex-to-complex multiplication.  
   
   
       5 . A reception apparatus comprising: 
 reception means for receiving a spread signal; and    despreading means for despreading an inphase component and a quadrature component of the received signal by using a short code and a long code, the long code having an inphase component and a quadrature component that are different from each other, wherein the despreading means is further for carrying out a complex-to-complex operation between a combination of the inphase component and the quadrature component of the received signal and a combination of the inphase component and the quadrature component of the long code.    
   
   
       6 . The reception apparatus as claimed in  claim 5 , wherein the complex-to-complex operation is a complex-to-complex multiplication.  
   
   
       7 . The reception apparatus as claimed in  claim 5 , wherein the quadrature component of the long code is obtained by shifting a phase of the inphase component of the long code.  
   
   
       8 . The reception apparatus as claimed in  claim 7 , wherein the complex-to-complex operation is a complex-to-complex multiplication.  
   
   
       9 . The reception apparatus as claimed in  claim 5 , wherein the despreading means despreads the inphase component and the quadrature component of the received signal by using a same short code for the inphase component and the quadrature component of the received signal.  
   
   
       10 . The reception apparatus as claimed in  claim 9 , wherein the complex-to-complex operation is a complex-to-complex multiplication.  
   
   
       11 . A transmission method comprising: 
 spreading an inphase component and a quadrature component of a signal to be transmitted by using a short code and a long code at least by carrying out a complex-to-complex operation between a combination of the inphase component and the quadrature component of the signal and a combination of the inphase component and the quadrature component of the long code, the long code having an inphase component and a quadrature component that are different from each other; and    transmitting the signal whose inphase component and quadrature component have been spread.    
   
   
       12 . The transmission method as claimed in  claim 11 , wherein the complex-to-complex operation is a complex-to-complex multiplication.  
   
   
       13 . A reception method comprising: 
 receiving a spread signal; and    despreading an inphase component and a quadrature component of the received signal by using a short code and a long code at least by carrying out a complex-to-complex operation between a combination of the inphase component and the quadrature component of the received signal and a combination of the inphase component and the quadrature component of the long code, the long code having an inphase component and a quadrature component that are different from each other.    
   
   
       14 . The reception method as claimed in  claim 13 , wherein the complex-to-complex operation is a complex-to-complex multiplication.  
   
   
       15 . A communication system comprising a transmission apparatus and a reception apparatus, wherein 
 the transmission apparatus comprises: 
 spreading means for spreading an inphase component and a quadrature component of a signal to be transmitted by using a short code and a long code of the spreading means, the long code of the spreading means having an inphase component and a quadrature component that are different from each other, wherein the spreading means is further for carrying out a complex-to-complex operation between a combination of the inphase component and the quadrature component of the signal to be transmitted and a combination of the inphase component and the quadrature component of the long code; and  
 transmission means for transmitting the signal whose inphase component and quadrature component have been spread, and  
 the reception apparatus comprises:  
 reception means for receiving the spread signal; and  
 despreading means for despreading an inphase component and a quadrature component of the received signal by using a short code and a long code of the despreading means, the long code of the despreading means having an inphase component and a quadrature component that are different from each other, wherein the despreading means is further for carrying out a complex-to-complex operation between a combination of the inphase component and the quadrature component of the received signal and a combination of the inphase component and the quadrature component of the long code.  
   
   
   
       16 . The communication system as claimed in  claim 15 , wherein the complex-to-complex operation is a complex-to-complex multiplication.