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- W2036635659 abstract "This paper describes a CDM/CDMA based approach for a 3-rd generation multi-beam satellite mobile and personal communications system using Highly Elliptical Orbit (HEO) satellites. The forward link uses a synchronous CDM intra-beam/asynchronous CDM inter-beam approach, while the return link uses a quasi-synchronous CDMA intra-beam/asynchronous CDMA inter-beam approach. Using probabilistic analysis, these approaches are shown to provide higher forward and return link capacities than equivalently synchronized FDM/FDMA approaches. Forward link transmissions are modulated using QPSK. Return link transmissions are modulated using either ϕ/4-QPSK or precompensated frequency modulation (PFM4). PFM4 is intended for use with a saturated amplifier in low-cost/power-efficient, e.g. hand-held, terminals, and can be demodulated using a ϕ/4-QPSK receiver. All forward and return link transmissions are coded using a rate 1/2, constraint length 9, convolutional code. The paper summarizes several key tradeoffs and the resulting system design." @default.
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- W2036635659 date "1998-07-01" @default.
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- W2036635659 title "A high capacity third-generation mobile satellite system design" @default.
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- W2036635659 doi "https://doi.org/10.1002/ett.4460090408" @default.
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