초록 ▼

A cordless telephone system connectable to the public switched telephone network having a base station and one or more handsets communicating with the base station by an RF link utility time division duplex direct sequence spread spectrum modulation technique, having a digital variable rate automati

A cordless telephone system connectable to the public switched telephone network having a base station and one or more handsets communicating with the base station by an RF link utility time division duplex direct sequence spread spectrum modulation technique, having a digital variable rate automatic gain control loop. The gain is varied by changing the scale factor for the discriminator output. A high gain scale factor is used during signal acquisition. When the signal has been acquired, a low scale factor is utilized during signal tracking. The controller in the base station and in the handset causes gain use of the different scale factor at the appropriate time.

대표청구항 ▼

[ What is claimed is:] [1.] In a direct sequence spread spectrum communication link, a digital automatic gain control circuit connected to receive in-phase and quadrature baseband signals that have been converted to digital format, the digital automatic gain control circuit comprising: means for gen

[ What is claimed is:] [1.] In a direct sequence spread spectrum communication link, a digital automatic gain control circuit connected to receive in-phase and quadrature baseband signals that have been converted to digital format, the digital automatic gain control circuit comprising: means for generating a discrimination signal from the received in-phase and quadrature baseband digital signals; and means for multiplying the generated discriminator signal by a first gain constant during signal acquisition and a second different gain constant during signal tracking.