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This paper presents a novel practical transmission signal design that enables a mobile satellite network to alert user terminals operating in a heavily power attenuated environment, such as inside buildings or in shadowed areas. In particular, we describe in detail a waveform design employing an orthogonal sequence modulated with p/2-BPSK and encoded with Reed-Solomon codes. The transmit waveform...
To improve the system capacity of conventional orthogonal frequency division multiplexing (OFDM) systems, the layered modulation OFDM scheme is proposed. The modulated OFDM symbols are separated into two layers as differential modulated symbols and coherent symbols. The differential symbols are used as pilots, which are combined with the coherent modulated data and sent out by the transmitter. At...
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