• A Cross-Layered Protocol Architecture for Highly-Dynamic Multihop Airborne Telemetry Networks

      Perrins, Erik; Sterbenz, James P. G.; Jabbar, Abdul; University of Kansas (International Foundation for Telemetering, 2008-10)
      Highly-dynamic mobile wireless communication presents unique challenges to the network at all layers, and requires the design of new protocols and mechanisms. We discuss a cross-layer aware internetwork architecture and the various mechanisms to enable reliable communication in high-velocity multihop scenarios. We introduce AeroNP, an IP-compatible network protocol that is designed for telemetry applications in an aeronautical environment. A new routing algorithm is presented that leverages location information combined with snooping to forward packets in the absence of stable end-to-end routes along, with an implicit congestion control mechanism.
    • End-to-End Disruption-Tolerant Transport Protocol Issues and Design for Airborne Telemetry Networks

      Perrins, Erik; Sterbenz, James P. G.; Rohrer, Justin P.; University of Kansas (International Foundation for Telemetering, 2008-10)
      Networks of airborne nodes provide unique challenges to end-to-end communication, in particular due to the highly dynamic topology and time-varying connectivity of high velocity nodes, and unreliability of the wireless communication channel. This paper explores the issues and presents a design for a domain-specific transport protocol targeted to multihop network that interconnects high-velocity airborne nodes with the telemetry application of returning sensor data with high reliability.
    • A Novel Multi-H CPM-SC-FDMA Transmission Scheme for Aeronautical Telemetry

      Wylie-Green, Marilynn P.; Perrins, Erik; Nokia Siemens Networks; University of Kansas (International Foundation for Telemetering, 2008-10)
      In this paper, we propose multi-h CPM-SC-FDMA, a novel transmission scheme which combines many of the key characteristics of continuous phase modulation (CPM) with single carrier Frequency Division Multiple Access (SC-FDMA) to produce a power efficient, robust modulation which is suitable for high-rate multiple-access aeronautical telemetry applications. The basis of our approach is found in the observation that the discrete-time samples from a CPM waveform constitute a constant envelope time domain sequence which can be pre-coded and subsequently mapped to a set of orthogonal subcarriers for an FDMA-style transmission. The resulting waveform exhibits power efficiency and easily supports multiple access.
    • PAM-Based Timing Synchronization for ARTM Modulations

      Perrins, Erik; Bose, Sayak; Wylie-Green, Marilynn P.; University of Kansas; Nokie Siemens Networks (International Foundation for Telemetering, 2008-10)
      A reduced-complexity decision-directed timing recovery method for continuous phase modulation (CPM) is presented. The timing recovery method is based on the pulse amplitude modulation (PAM) representation - or Laurent representation - of CPM, and is applied to the family of three telemetry modulations: PCM/FM, SOQPSKTG, and ARTM CPM. This work is the next step in an ongoing effort to develop reduced-complexity PAM-based receiver methods for aeronautical telemetry. We quantify the steady-state tracking accuracy of the proposed timing recovery method and show that it performs very close to the theoretical limit given by the modified Cramer-Rao bound (MCRB).We also demonstrate that the proposed method is free of false-lock points for all three modulations.
    • Spectrally Efficient Concatenated Convolutional Codes with Continuous Phase Modulations

      Perrins, Erik; Damodaran, Kanagaraj; University of Kansas (International Foundation for Telemetering, 2008-10)
      We develop bandwidth-efficient serially concatenated coded (SCC) continuous phasemodulation (CPM) techniques for aeronautical telemetry. The concatenated code consists of an inner and an outer code, separated by an interleaver, and is decoded using relatively simple near-optimum iterative decoding algorithms. CPM waveforms such as shaped-offset quadrature phase shift keying (SOQPSK) and pulse code modulation/ frequency modulation (PCM/FM), which are currently used in military satellite and aeronautical telemetry standards, can be viewed as inner codes due to their recursive nature. For the outer codes, we apply serially concatenated convolutional codes (SCCC) because of their large coding gains, high coding rates, and because their decoding algorithms are readily implemented. High-rate codes are of special interest in aeronautical telemetry applications due to recent reductions in available spectrum and ever-increasing demands on data rates. We evaluate the proposed coding schemes with a large set of numerical simulation results and make a number of recommendations based on these results.
    • Telemetry System for a Remote Ecological Field Station

      Perrins, Erik; Kumaraswamy, Balachandra; Bose, Sayak; University of Kansas (International Foundation for Telemetering, 2008-10)
      We present the system-level design of a data transfer link for a remote ecological field station. We include the desired attributes of this link, a number of candidate solutions, and the details of the system that was selected for implementation. We also discuss some simple measurements that help determine the effect of emerging foliage on the quality of the link. Overall, the link is more than capable of meeting the data transfer needs of the ecological research application.
    • Turbo Product Code with Continuous Phase Modulation

      Perrins, Erik; Damodaran, Kanagaraj; University of Kansas (International Foundation for Telemetering, 2008-10)
      A basic problem statement in aeronautical telemetry has been to develop communication systems with good detection efficiency coupled with good spectral efficiency. Shaped-offset quadrature phase shift keying (SOQPSK) is a spectrally more efficient form of continuous phase modulation (CPM) as opposed to pulse code modulation/frequency modulation (PCM/FM). With these modulation techniques, we propose concatenated turbo product code (TPC) with CPM as a solution to our above problem statement. The performance of this turbo product coded CPM (TPC-CPM) system is simulated under coherent and non-coherent demodulation. Finally we present simulation results showing impressive coding gain performance of TPC-CPM over the AWGN channel.