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Autor:
S.E. Carter, D.C. Malocha
Publikováno v:
IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control. 47:967-973
This paper introduces a new weighted stepped chirp code signal for direct sequence spread spectrum (DS/SS) communications systems. This code signal uses the truncated cosine series functions as the chip functions, and it is the result of discretizing
Publikováno v:
IEEE Transactions on Communications. 42:1465-1470
Classical cosine series functions have been applied to the synthesis of finite impulse response filters because of their closed analytic form and low sidelobe levels. It is proposed that cosine series functions be applied to the synthesis of pulse sh
Publikováno v:
IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control. 40:496-503
A surface acoustic wave (SAW) modulation system has been built, using a combination of a digital message sequence, an impulse driver, and different SAW modulator filters, for experimental testing of a wide variety of quadrature binary modulation sche
Publikováno v:
IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control. 40:504-511
Approaches for designing surface acoustic wave (SAW) filters used in pulsed quadrature binary modulation (QBM) systems are presented. Several previously defined pulse shapes were implemented by a SAW filter and showed good QBM system performance with
Publikováno v:
IEEE Transactions on Communications. 41:11-15
It is proposed that classical cosine series window functions be applied to finite symbol duration quadrature binary modulation systems as pulse shapes in the interest of increasing the spectral confinement of the resulting modulated signals. The resp
A simplified and efficient numerical model for charge injection in acoustic charge transport devices
Publikováno v:
IEEE Transactions on Electron Devices. 39:1811-1820
A numerically efficient model for simulating electrical charge injection in acoustic charge transport (ACT) devices is developed. This model simplifies an existing charge injection model and is derived using the coupled set of semiconductor device eq
Differential phase shift keying direct sequence spread spectrum single SAW based correlator receiver
Publikováno v:
IEEE transactions on ultrasonics, ferroelectrics, and frequency control. 45(3)
This paper presents the design and measurement of a SAW device to be used in a correlator receiver for a differential phase shift keying direct sequence spread spectrum (DPSK/DSSS) system. The DPSK modulation format allows noncoherent data demodulati
Publikováno v:
IEEE transactions on ultrasonics, ferroelectrics, and frequency control. 46(4)
This paper presents the design, fabrication, and experimental results for a differential phase shift keying (DPSK) single SAW-based correlator on GaAs for direct sequence spread spectrum applications. The DPSK modulation format allows for noncoherent
Autor:
Jiann-Shiun Yuan, Juin J. Liou, M. Belkerdid, Kalpathy B. Sundaram, K. R. Lee, D.C. Malocha, S.M. Knapp
Publikováno v:
Solid-State Electronics. 33:1629-1632
The quasi-static approximation, which assumes that free-carrier propagation delay in the semiconductor device is zero, is often used in device modeling. Consequently, the quasi-static model is adequate only for low-frequency excitations for which fre