10-Gbit/s BPSK Modulator and Demodulator for a 120-GHz-Band Wireless Link

This paper presents 10-Gbit/s binary phase-shift keying modulator and demodulator modules for a 120-GHz-band millimeter-wave wireless link. To reduce system complexity, we selected differentially coherent detection for the demodulator and designed the modulator and demodulator without IF circuits. T...

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Bibliographic Details
Published in:IEEE transactions on microwave theory and techniques 2011-05, Vol.59 (5), p.1361-1368
Main Authors: Takahashi, H, Kosugi, T, Hirata, A, Murata, K, Kukutsu, N
Format: Article
Language:English
Subjects:
Amplifiers
Applied sciences
Binary phase shift keying
Circuit properties
Circuits of signal characteristics conditioning (including delay circuits)
Data transmission
Demodulation
Demodulators
Electric, optical and optoelectronic circuits
Electronic circuits
Electronics
Exact sciences and technology
Gigabit-class communication
Integrated circuit modeling
Intermediate frequency
Links
Microwave circuits, microwave integrated circuits, microwave transmission lines, submillimeter wave circuits
millimeter-wave monolithic integrated circuits
MMICs
modulation
Modulators
Modules
Phase shifters
Signal convertors
Studies
Wireless communication
wireless link
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Summary:This paper presents 10-Gbit/s binary phase-shift keying modulator and demodulator modules for a 120-GHz-band millimeter-wave wireless link. To reduce system complexity, we selected differentially coherent detection for the demodulator and designed the modulator and demodulator without IF circuits. The direct-conversion modulator consists of a 180° hybrid coupler, gain-control amplifiers, and a Wilkinson combiner. The demodulator has a 100-ps delay line made with coplanar waveguides and a variable phase shifter. The modulator and demodulator were fabricated with 0.1-μm-gate HEMTs lattice-matched to an InP substrate. A test element of the modulator exhibited a static vector error magnitude of 5%. We also mounted the modulator and demodulator in WR-8 waveguide modules and evaluated the characteristics of 10-Gbit/s data transmission. The bit-error rate for 10-Gbit/s pseudorandom binary sequence 2 7 -1 data is 10 -12 at a received power of -39 dBm.
ISSN:0018-9480
1557-9670
DOI:10.1109/TMTT.2010.2097603