Multi-standard simulation of WLAN/UMTS/GSM transceivers for analog front-end validation and design
ABSTRACT A system-level multi-standard simulator is set up to help the architectural and circuit-level design of RF front-ends whose building blocks are meant to be shared between transceiver chains of different standards. The simulator distinguishes the baseband digital processing and analog processing. Non idealities of analog blocks are modeled in detail taking into account the nonlinearities, band limitation, losses, thermal noise, etc. The simulator provides all classical compliance tests (sensitivity, maximum input, adjacent channel rejection, pureness of modulation, spectral profile, etc.) and can also assess the joint effect of high-level analog design parameters on the performance of the transmission chain at bit- or packet- level.
Conference Proceeding: Effects of HPA-Nonlinearity on a 4-DPSK/OFDM-Signal for a Digital Sound Broadcasting System.[show abstract] [hide abstract]
ABSTRACT: Orthogonal Frequency Division Multiplexing (OFDM) in conjunction with a 4-DPSK modulation format has been proposed for the future digital audio broadcasting system (DAB), that should provide compact disk sound quality in portable, vehicular and fixed receivers. With properly chosen parameters, this system should be appropriate for both terrestrial and satellite transmission. In this paper the influence of the nonlinear distortions introduced by the high power amplifier (HPA) of the transmitter is examined. In particular, the degradation in power efficiency due to intermodulation effects and backoff operating, as well as spectral degradations are investigated.It is shown for three different kinds of limiting amplifier models, that even with an output backoff (OBO) in the region of 5-6 dB, the degradation of, e.g., a 512-carrier 4-DPSK/OFDM system relative to the linear case is below 1.7 dB, while the regenerated sidelobes of the transmitted spectrum are kept below -20 dB.Second European Conf. on Sat. Comm., 22. - 24.10.91, Liege, Belgium.; 10/1991
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ABSTRACT: Simple two-parameter formulas are presented for the functions involved in the amplitude-phase and the quadrature nonlinear models of a TWT amplifier, and are shown to fit measured data very well. Also, a closed-form expression is derived for the output signal of a TWT amplifier excited by two phase-modulated carriers, and an expression containing a single integral is given when more than two such earriers are involved. Finally, a frequencydependent quadrature model is proposed whose parameters are obtainable from single-tone measurements.IEEE Transactions on Communications 12/1981; · 1.75 Impact Factor
Article: Cmos wireless transceiver design