High Penetration Alerting Signal Design for Mobile Satellite Communications Systems

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 π/2-BPSK and encoded with Reed-Solomon codes. The transmit waveform performance is characterized in terms of its Power Spectral Density (PSD) and Peak-to-Average Power Ratio (PAPR). The receiver performance is evaluated in terms of the symbol error rate and message error rate under the AWGN and Rician channels. Here we have examined the performance of conventional sequence detection as well as computationally efficient joint sequence detection with simple erasure decoding.