1,930 research outputs found
Patterns of Technology, Industry Concentration, and Productivity Growth Without Scale Effects
Get PDFThis paper investigates the relationship between geographic patterns of industrial activity and endogenous growth in a two region model of trade that exhibits no scale effect. The in-house process innovation of manufacturing firms drives productivity growth and is closely associated with firm-level scales of production and relative levels of accessible technical knowledge. Focusing on long-run industry shares and a cross-region productivity gap, we find that dispersed equilibria with positive industry shares for both regions always produce higher growth rates than core-periphery equilibria with all industry locating in one region. Moreover, the highest growth rate arises in a symmetric steady state that features no productivity gap and equal shares of industry leading to the conclusion that the geographic concentration of industry has a negative impact on overall growth. Convergence towards a dispersed equilibrium, however, is contingent on the levels of inter-regional transport costs and knowledge dispersion. Finally, we explore the implications of greater economic integration arising from reduced transport costs and greater knowledge dispersion for patterns of industry and productivity, and for regional welfare levels within a dispersed equilibrium.Industry Concentration, Industry Share, Productivity Gap, Productivity Growth, Scale Effect
Development of a coded 16-ary CPFSK coherent demodulator
Get PDFTheory and hardware are described for a proof-of-concept 16-ary continuous phase frequency shift keying (16-CPFSK) digital modem. The 16 frequencies are spaced every 1/16th baud rate for 2 bits/sec/Hz operation. Overall rate 3/4 convolutional coding is incorporated. The demodulator differs significantly from typical quadrature phase detector approaches in that phase is coherently measured by processing the baseband output of a frequency discriminator. Baud rate phase samples from the baseband processor are decoded to yield the original data stream. The method of encoding onto the 16-ary phase nodes, together with convolutional coding gain, results in near quad PSK (QPSK) performance. The modulated signal is of constant envelope; thus the power amplifier can be saturated for peak performance. The spectrum is inherently bandlimited and requires no RF filter
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