摘要: In this chapter, wireless communication technologies relevant to cognitive radios are reviewed. This includes a discussion of some the capacity limitations in systems, nonideal effects radio and an overview orthogonal frequency-division multiplexing (OFDM) encoding methods. Cognitive detailed chapter. The architectural components as well algorithms for frequency sensing spectrum management Finally, recent standardizations that based on reviewed along with survey deployments TV white space (TVWS) technologies, which is implementation radio.