Title :
Increased system gain 49-QPRS digital microwave design concept
Author :
Yang, Jiashi ; Feher, Kamilo
Author_Institution :
Dept. of Electr. Eng. & Comput. Sci., California Univ., Davis, CA, USA
Abstract :
A novel filtering strategy for 49-QPRS (quadrature partial response system) modems operated at a 90-Mb/s bit rate in a radio channel having a 20-MHz FCC (US Federal Communication Commission) authorized bandwidth is proposed. It is demonstrated that the proposed system has a 2.5-dB system gain advantage over 64-QAM (quadrature amplitude modulation) systems. The advantage of this new 49-QPRS scheme is that it is ISI (intersymbol interference)-free when operated with a bandwidth efficiency of 4.5 b/s/Hz. The BER (bit-error rate) performance, eye diagrams, and constellation of the 49-QPRS are investigated with computer simulation in a linear AWGN (additive white Gaussian noise) channel and in nonlinearly amplified AWGN channels
Keywords :
digital filters; digital radio systems; microwave links; modems; random noise; spectral analysis; telecommunication channels; 2.5 dB; 20 MHz; 90 Mbit/s; BER; FCC mask; constellation; digital microwave design concept; eye diagrams; filtering strategy; linear AWGN channel; modems; nonlinearly amplified AWGN channels; quadrature partial response system; radio channel; AWGN; Bandwidth; Bit error rate; Bit rate; FCC; Filtering; Intersymbol interference; Microwave filters; Modems; Quadrature amplitude modulation;
Conference_Titel :
Communications, 1990. ICC '90, Including Supercomm Technical Sessions. SUPERCOMM/ICC '90. Conference Record., IEEE International Conference on
Conference_Location :
Atlanta, GA
DOI :
10.1109/ICC.1990.117170
