We evaluate Forward Error Correction (FEC) codes in the context of a novel routing protocol HDARP+ for airborne networks. HDARP+ uses directional antennas and dynamic FEC coding to avoid detection by adversaries. The use of FEC coding is dynamic in the sense that different FEC codes, or no FEC code, will be used depending on the relative position of friendly and adversary aircraft. Due to the real-time restrictions in airborne networks, encoding and decoding must be fast and done through table lookup. Since we use table lookup, the FEC codes must be short. We evaluate two types of short FEC codes: Reed-Solomon (RS) codes, and FEC codes found using greedy search (called GS codes). The results show that the RS codes are better than the GS codes at handling error bursts. However, the GS codes are more flexible when it comes to finding attractive trade-offs between the code's ability to increase the number of the cases when hostile detection can be avoided (related to the coding gain), the code rate and the amount of memory required for implementing lookup tables.

Kursen Analys 1 på civilingenjörsprogrammen och ingenjörsprogrammen har över 200 förstaårs-studenter. Många av studenterna kommer direkt från gymnasiet och har endast läst en termin på högskolan. Alla har inte kommit in i en lämplig studieteknik. Undervisningen i Analys 1 lades upp för att främja en bra studieteknik.