Title :
A 8.75-MBaud single-chip digital QAM modulator with frequency-agility and beamforming diversity
Author :
Cho, Kyung-Ho ; Samueli, Henry
Author_Institution :
CogNet MicroSyst., Los Angeles, CA, USA
Abstract :
A VLSI implementation of an all-digital frequency-agile single-chip quadrature amplitude modulation (QAM) modulator is presented. The proposed chip supports wide variety data rates with diversity in spatial and frequency domain suitable for a wireless modem. The QAM modulator accepts either a parallel or serial bit stream input and assigns these to various QAM symbol formats for transmission. An optimized architecture for the variable modulator supports QAM symbol rates from 6 kBaud to 8.75 MBaud continuously and digitally-flexible IF frequencies up to 70 MHz with four channel beamforming diversity
Keywords :
VLSI; application specific integrated circuits; array signal processing; data communication equipment; digital communication; digital signal processing chips; frequency agility; modulators; quadrature amplitude modulation; 70 MHz; ASIC; QAM symbol formats; VLSI implementation; beamforming diversity; data rates; digital QAM modulator; digitally-flexible IF frequencies; four channel diversity; frequency-agility; optimized architecture; parallel bit stream input; quadrature amplitude modulation; serial bit stream input; single-chip modulator; variable modulator; wireless modem; Array signal processing; Clocks; Digital modulation; Filters; Frequency conversion; Frequency diversity; Frequency modulation; Optical modulation; Quadrature amplitude modulation; Sampling methods;
Conference_Titel :
Custom Integrated Circuits Conference, 2000. CICC. Proceedings of the IEEE 2000
Conference_Location :
Orlando, FL
Print_ISBN :
0-7803-5809-0
DOI :
10.1109/CICC.2000.852611
