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  
Applicant(s) Name  Qualcomm Inc.  
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.