Title :
High-speed QPSK modulator and demodulator with subharmonic pumping
Author :
Trambarulo, R. ; Schneider, M.V. ; Gans, M.J.
Author_Institution :
AT&T Bell Lab., Holmdel, NJ, USA
Abstract :
A high-speed quadrature-phase-shift-keying (QPSK) modulator-demodulator is described. Both units are pumped with a common 6.5-GHz local oscillator giving a modulated carrier at 13 GHz. The performance of each unit was evaluated and adjusted to give satisfactory performance with a single tuning element in the local oscillator circuits. Bit error rates were measured for transmission of pseudorandom data streams through the modulator-demodulator pair. Typical operating conditions and bit error rates for the combination are summarized. Data can be transmitted and recovered at speeds up to a total information rate of 3.6 Gb/s with an error rate less than 10/sup -11/.<>
Keywords :
data communication equipment; demodulators; digital communication systems; microwave links; modulators; phase shift keying; 13 GHz; 3.6 Gbit/s; 6.5 GHz; BER; QPSK; bit error rates; data transmission; demodulator; digital communication; high-speed; local oscillator; microwave links; modulated carrier; modulator; pseudorandom data streams; quadrature-phase-shift-keying; subharmonic pumping; Baseband; Circuits; Demodulation; Digital communication; Digital modulation; Frequency; Information rates; Local oscillators; Phase modulation; Quadrature phase shift keying;
Conference_Titel :
Microwave Symposium Digest, 1988., IEEE MTT-S International
Conference_Location :
New York, NY, USA
DOI :
10.1109/MWSYM.1988.22167
