Data transmitter and receiver of a DS-CDMA communication system

A transmitter in a Direct-Sequence Code Division Multiple Access communication system, comprising:

• a pilot channel encoder for multiplying pilot channel data by a predetermined pilot channel orthogonal code and outputting encoded pilot channel data;
• a user channel encoder for multiplying a plurality of user channel data by a plurality of user channel orthogonal codes, each orthogonal to an adjacent code, and outputting a plurality of encoded user channel data;
• a pseudo-random noise generator for generating an I-arm pseudo-random noise code and a Q-arm pseudo-random noise code;
• a pilot channel spreader for multiplying the encoded pilot channel data by the I-arm pseudo-random noise code and the Q-arm pseudo-random noise code, respectively, and outputting I-arm and Q-arm spread pilot channel data;
• a user channel spreader for multiplying the plurality of encoded user channel data by an inverted Q-arm pseudo-random noise code and the I-arm pseudo-random noise code, respectively, and outputting a plurality of I-arm spread user channel data and a plurality of Q-arm spread user channel data;
• a first adder for adding the I-arm spread pilot channel data and the plurality of I-arm spread user channel data to produce I-arm spread data;
• a second adder for adding the Q-arm spread pilot channel data and the plurality of Q-arm spread user channel data to produce Q-arm spread data;
• a first modulator for multiplying the I-arm spread data by an in-phase component of a predetermined carrier to produce an I-arm modulated signal;
• a second modulator for multiplying the Q-arm spread data by a quadrature-phase component of the predetermined carrier to produce a Q-arm modulated signal;
• a third adder for adding the I-arm modulated signal and the Q-arm modulated signal;
• a band pass filter for band-pass filtering the output of the third adder;
• and
• an amplifier for power-amplifying the output of the band pass filter and outputting a radio frequency signal for transmission via a communication channel.

A transmitter in a spread spectrum communication system using a pilot channel, comprising:

• means for generating first and second pseudo-random noise codes and an inverted second pseudo-random noise code;
• a first band spreader for band spreading a modulated pilot channel signal with each of the first pseudo-random noise code and the second pseudo-random noise code to produce band spreaded in-phase and quadrature-phase pilot channel signals;
• a second band spreader for band spreading modulated information signals of multiple user channels with each of the first pseudo-random noise code and the inverted second pseudo-random noise code to produce band spreaded in-phase and quadrature-phase information signals of said multiple user channels;
• and
• means for combining the band spreaded in-phase pilot channel signal and the band spread in-phase information signals of said multiple user channels, and combining the band spreaded quadrature-phase pilot channel signal and the band spreaded quadrature-phase information signals of said multiple user channels so as to generate a spread spectrum signal comprising in-phase and a quadrature-phase components for transmission via a communication channel.