Cognitive Radio Spectrum Sensing
Spectrum sensing is a crucial sequential process in cognitive radio that enables opportunistic spectrum access and dynamic spectrum utilization. This technique provides awareness of the radio operating environment, allowing cognitive radios to adaptively adjust parameters such as carrier frequency, transmitter power, and waveform characteristics to deliver optimal connectivity services while maintaining interference constraints. In practical implementations, spectrum sensing algorithms typically leverage knowledge about primary users' signal characteristics, including modulation schemes, symbol rates, chip sequences, and statistical signal properties to enhance detection performance.