This chapter describes a set of spectrum sensing algorithms to be employed for the detection of OFDM-based (Ortogonal Frequency Division Multiplexing) transmissions in the TV bands (470-790 MHz) i.e. DVB-T channels. Spectrum sensing techniques take a crucial role to support geo-referenced TV White-Spaces (TVWS) databases and to maintain them up-to-date over time. When considering a single-antenna spectrum sensing unit, very effective methods for detecting OFDM signals are based on DVB-T Cyclic Prefix and pilot pattern feature detection. Starting from these, further improvements can be made using multi-antenna techniques. This Chapter shows performance analysis of feature-based single-antenna and multiantenna techniques in order to derive trade-offs and conclusions.
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COCommunication Object ABC Spelled-out abbreviation and definition BABI Spelled-out abbreviation and definition CABR Spelled-out abbreviation and definition 3
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