Title :
An 11-tap 0.9-μm CMOS digital transversal equalizer for digital radio
Author :
Reeve, H.C. ; Ward, R.B. ; Lin, C.J. ; Martin, G.D.
Author_Institution :
AT&T Bell Lab., North Andover, MA, USA
Abstract :
A 0.9-μm CMOS VLSI device was designed and developed to perform as an adaptive transversal equalizer for digital radio. The device contains an 11-tap multiply-add structure complete with control hardware for 12-b coefficients. Void of any pipelining, the device is guaranteed for 27-MHz operation, and it has demonstrated speeds in excess of 40 MHz. A digital radio modem has been designed by AT&T using the VLSI device and is now being manufactured for a 64-QAM (quadrature amplitude modulation) 4-GHz radio system. BER (bit error rate) performance versus S/N ratio was within 1.8 dB of theoretical (no error correction) at a BER of 1×10-8. M-curves were measured for the 20-MHz channel and were very close to theoretical. Finally, modem acquisition statistics were tabulated under various channel distortions, with the average time of acquisition being less than 200 ms
Keywords :
CMOS integrated circuits; VLSI; adaptive systems; digital integrated circuits; digital radio systems; equalisers; error statistics; microwave links; modems; radio equipment; 0.9 micron; 11-tap multiply-add structure; 200 ms; 27 to 40 MHz; 4 GHz; 64-QAM radio system; AT&T; BER; CMOS VLSI device; M-curves; S/N ratio; SHF; SNR; acquisition time; adaptive equaliser; bit error rate; control hardware; digital radio modem; digital transversal equalizer; modem acquisition statistics; quadrature amplitude modulation; Bit error rate; Digital communication; Equalizers; Error correction; Hardware; Manufacturing; Modems; Pipeline processing; Quadrature amplitude modulation; Very large scale integration;
Conference_Titel :
Global Telecommunications Conference and Exhibition 'Communications Technology for the 1990s and Beyond' (GLOBECOM), 1989. IEEE
Conference_Location :
Dallas, TX
DOI :
10.1109/GLOCOM.1989.64005
