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

fYear

1989

fDate

27-30 Nov 1989

Firstpage

413

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Global Telecommunications Conference and Exhibition 'Communications Technology for the 1990s and Beyond' (GLOBECOM), 1989. IEEE

Conference_Location

Dallas, TX

Type

conf

DOI

10.1109/GLOCOM.1989.64005

Filename

64005