Current SATCOM systems provide far from the best possible theoretical bandwidth-efficiency. Techniques have recently emerged that provide point solutions allowing very efficient performance. However, with these approaches, little attention is usually paid to the implementation complexity or the… More

COCOMs and G/RSSCs need the ability to rapidly and conveniently perform MUOS communications usage planning and to determine if a particular allocation is sufficient so as to, if necessary, negotiate an adjusted apportionment to service their priorities and throughput requirements. To satisfy this… More

Current Link-16 receive terminals are large, heavy, expensive, and power inefficient because of their use of analog L-band components for downconversion and dehopping. This also limits operation to a single net. The proposed effort overcomes these limitations by exploiting advances in data converter… More

Gaussian Minimum Shift Keying (GMSK) is a CCSDS standard scheme for space missions requiring very bandwidth efficient communications using transceivers with strict size, weight, and power restrictions. GMSK provides a constant envelope signal that passes unaltered through system nonlinearities,… More

COCOMs and G/RSSCs need the ability to rapidly and conveniently perform MUOS communications usage planning and to determine if a particular allocation is sufficient so as to, if necessary, negotiate an adjusted apportionment to service their priorities and throughput requirements. To satisfy this… More

With more missions at high data rates demanding use of limited spectral resources, NASA's SCaN office recently coordinated a study to identify a space communications architecture to support future missions. The study recommends precoded GMSK and AR4JA LDPC codes as preferred options in most… More

ABSTRACT: Several MILSATCOM systems allow the use of turbo codes to improve communications performance. These systems were standardized before the widespread use of Low Density Parity Check (LDPC) codes. While turbo and LDPC codes have many similarities, ORB Analytics believes that future… More

Dynamic Spectrum Access (DSA) promises much better communications quality, throughput, and robustness for cognitive radios sharing spectrum with other (e.g., primary) users. Effective DSA radios will identify any"spectrum space"opportunities that can opportunistically be exploited for… More

This Small Business Technology Transfer (STTR) Phase I project will involve research on and development of a reconfigurable wireless platform enabling secondary access of wireless spectrum via simultaneous data transmission across several disjoint frequency channels. In particular, the proposed… More

Dynamic Spectrum Access (DSA) promises much better communications quality and throughput for cognitive radios sharing spectrum with primary users. The most effective DSA radios will use spectrum sensing to identify any opportunities for communications. For purposes of identifying spectrum holes, it… More