Protection of primary users in dynamically varying radio environment: practical solutions and challenges

EURASIP Journal on Wireless Communications and Networking

Table 4 Computational complexity (the number of complex additions and multiplications) of the proposed spectrum shaping algorithm with reduced complexity (per an OFDM symbol)

Operations	The number of at the transmitter related to			The number of operations at the receiver operating in operations
	CC method implementation	Windowing	Overall spectrum shaping	Standard configuration	Proposed configuration
Complex additions	(α- 1)γ	β	(α - 1)γ + β	0	α(α + γ - 1)
Complex multiplications	αγ	2β	αγ + 2β	α	α(α + γ)
Total no. operations for:
Scenario 1, Use-case 1	3300	192	3492	138	41262
Scenario 2, Use-case 1	3792	288	4080	119	32011
Scenario 3, Use-case 1	7320	288	7608	153	54009
Scenario 1, Use-case 2	1164	12	1176	146	43654
Scenario 2, Use-case 2	2024	12	2036	127	34163
Scenario 3, Use-case 2	3756	12	3768	157	52909

α, the total number of DCs; γ, the total number of CCs; β, the window extension duration in samples.