id	author	title	date	pages	extension	mime	words	sentences	flesch	summary	cache	txt
work_jfopvflxkna3jp2tovexw7imbi	Xianghui Xiao	Signal transmission model for the substations grounding grid	2014	7	.pdf	application/pdf	4640	537	70	secondary users to maintain the accurate channel state spectrum sensing scheme in which the secondary users adopt Ⅱ. PROPOSED CHANNEL SENSING SCHEME information sensed by each secondary user is consistent un-used licensed channels from other secondary users, and 4) RP: notify the other secondary users the sensing results. The secondary users can utilize the OFF time slot D. Backoff-based Channel Sensing Policy The basic idea of our backoff-based channel sensing discuss details of our backoff-based channel sensing policy. results of the i-th channel from other secondary user: 0: The secondary user reserves enough channel resources N denote the number of channels sensed to be idle, j-th secondary user select i-th channel to sense, the SDR secondary users, however, update their channel information secondary users against the number of channels (x), of the network achieved by the backoff-based sensing policy the primary network; therefore, backoff-based channel 	./cache/work_jfopvflxkna3jp2tovexw7imbi.pdf	./txt/work_jfopvflxkna3jp2tovexw7imbi.txt