Multicarrier cdma transmission system and transmission method

Abstract

In multicarrier transmission for multiplying transmit data individually by each code constituting orthogonal codes and transmitting each result of multiplication by a prescribed subcarrier, a plurality of different subcarriers are assigned exclusively to each user and each user performs multicarrier transmission of the transmit data by the subcarriers assigned. Further, a base station assigns a plurality of different subcarriers to each user exclusively, applies beam-forming processing on a per-user basis and performs multicarrier transmission of transmit data to each user by the subcarriers assigned.

What is claimed is: 
     
         1 . A receiving apparatus of a base station in a multicarrier CDMA transmission system for multiplying transmit data individually by each code constituting orthogonal codes and transmitting each result of multiplication by a prescribed subcarrier, comprising:
 a subcarrier separator for separating subcarrier components, on a per-user basis, from a receive signal;   a fading compensator for performing fading compensation on a per-subcarrier basis;   a multiplier/combiner for multiplying each subcarrier component of a plurality of subcarriers that have been assigned to a user by a corresponding code from among codes constituting orthogonal codes that have been assigned to the user, combining results of multiplication, and similarly multiplying each subcarrier component by a corresponding code from among codes constituting other orthogonal codes that have been assigned to said user and combining results of multiplication;   a parallel/serial converter, which accepts each of the results of multiplication and combination as parallel data, for converting this parallel data to serial data; and   a data demodulator for demodulating data based upon an output signal of said parallel/serial converter.   
     
     
         2 . A receiving apparatus of a mobile station in a multicarrier CDMA transmission system for multiplying transmit data individually by each code constituting orthogonal codes and transmitting each result of multiplication by a prescribed subcarrier, comprising:
 a filter unit for extracting subcarrier components, which have been assigned to a user, from a receive signal;   a fading compensator for performing fading compensation on a per-subcarrier basis;   a multiplier/combiner for multiplying each subcarrier component of a plurality of subcarriers that have been assigned to a user by each code constituting orthogonal codes that have been assigned to the user, combining results of multiplication, and similarly multiplying each subcarrier component by each code from among codes constituting other orthogonal codes that have been assigned to the user and combining results of multiplication;   a parallel/serial converter, which accepts each of the results of multiplication and combination as parallel data, for converting this parallel data to serial data; and   a data demodulator for demodulating data based upon an output signal of said parallel/serial converter.