Cognitive Radio RF: Overview and Challenges

Table 3

Spectrum sensing—regulation requirements.

	FCC 2010	Ofcom 09	IEEE 802.22
Max. power adjacent to TV/other [dBm]	16/17	4/17	36
Adjacent-channel emission	−72 dBc*	−46 dBc	−49 dBc
Digital TV sensing threshold [dBm/MHz]	−114/6	−120/8	‒116/6
Wireless microphone sensing threshold [dBm/MHz]	−107/0.2	−126/0.2	−10/0.2
Probabilitydetection/probabilityFalseAlarm			90%/10%
Backoff time(s)	2	<1	2
Sensing frequency (1/minutes)	1	60	30
Bandwidth	6	8	6, 7, 8
Transmit power control	Yes	Yes	Yes
Modulation	Free	Free	OFDM

*Measured in 100 kHz with reference to total power in 6 MHz.