Variable rate signal transmission method and device in expansion spectrum communication system using coset code


Application Number  00128964 Application Date  1994.11.01
Publication Number  1295391 Publication Date  2001.05.16
Priority Information   1993/11/1 US 08/146,642  
International
Classification
 H04B1/707;H04J13/00;H04L27/34  
Applicant(s) Name  Qualcomm Inc.  
Address    
Inventor(s) Name  Iforren Chiharvie  
Patent Agency Code  31100 Patent Agent  chen liang
AbstractAn improved system and method for communicating information at variable data rates over in-phase (I) and quadrature phase (Q) communication channels in a CDMA spread spectrum communication system is disclosed herein. The information signal is initially divided into first and second subsignals, which are respectively provided to first and second coset-encoding networks. The first coset-encoding combines the first subsignal with a first coset code, while the second coset-encoding network combines the second subsignal with a second cosed code orthogonal to the first cosed code. A composite coset-encoded signal formed from the first and second coset-encoded signals is then modulated by an orthogonal function signal to provide a first modulated signal. In-phase pseudorandom noise and quadrature phase pseudorandom noise signals of predetermined PN codes are used for spreading the first modulated signal for transmission to a receiver over either the I or Q communication channel, respectively.