Cognitive Radio Spectrum Management for Smart Grid Communication Networks in the Nigerian Electricity Sector

This research develops the theoretical foundations and practical algorithms for cognitive radio based spectrum management applied to smart grid communication networks in the Nigerian electricity sector, making original contributions to the intersection of cognitive radio theory and power systems communication engineering in a spectrum-constrained national context. Nigerian smart grid deployments face a fundamental tension between the need for dedicated, reliable communication spectrum for mission-critical power system applications including protection teleprotection, SCADA, and smart metering, and the severe spectrum scarcity in the frequency bands most suitable for these applications in Nigeria's crowded urban electromagnetic environment. The research develops an original cognitive radio framework in which smart grid communication devices dynamically access licensed spectrum during incumbent user absence while providing interference protection guarantees to primary users, adapted specifically to the requirements of power system communication applications that have stringent latency and reliability constraints incompatible with generic cognitive radio protocols. Theoretical contributions include the derivation of achievable capacity and reliability bounds for cognitive radio based smart grid communication links under the statistical interference models characterised from spectrum occupancy measurements conducted in Lagos, Kano, and Abuja; development of a novel cooperative spectrum sensing algorithm exploiting the known spatial correlation structure of the Nigerian electricity grid graph to reduce sensing time while achieving the required detection probability; and a joint spectrum access and power control optimisation framework that simultaneously satisfies smart grid communication QoS requirements and primary user interference constraints. Keywords: cognitive radio, smart grid communication, spectrum management, Nigeria, interference protection.