Title :
A baseband processor for IS-54 cellular telephony
Author :
Friedman, Vladimir ; Lakshmikumar, Kadaba R. ; Price, David L. ; Le, Tuan N. ; Kumar, Jit
Author_Institution :
AT&T Bell Labs., Middletown, NJ, USA
fDate :
5/1/1996 12:00:00 AM
Abstract :
This paper describes the design of a baseband processor for IS-54 North American cellular telephony standard. The effect of diverse circuit impairments on the error vector in digital mode and on the parasitic amplitude modulation in analog mode are analyzed. An analog offset compensation scheme, which takes advantage of the TDMA operation, is presented. The device incorporates a Manchester data decoder for data transmission in analog mode. The messages can be sent via two interfaces to the DSP or μ-processor. The architecture of the digital signal processing chain is discussed. The device is fabricated in a 0.9 μ CMOS technology with an area of 40 mm2
Keywords :
CMOS integrated circuits; amplitude modulation; cellular radio; microprocessor chips; telecommunication standards; time division multiple access; 0.9 micron; CMOS technology; IS-54 cellular telephony; Manchester data decoder; TDMA operation; analog offset compensation; baseband processor; circuit impairments; data transmission; digital signal processing chain; error vector; parasitic amplitude modulation; telephony standard; Baseband; CMOS technology; Circuits; Decoding; Digital signal processing; Modems; Quadrature amplitude modulation; Radio frequency; Telephony; Time division multiple access;
Journal_Title :
Solid-State Circuits, IEEE Journal of
