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Spectrum sensing has continued to emerge as an essential topic for the cognitive networks where two kinds of users primary and secondary will share the band. This paper proposes a method for real-time detection of secondary users at the base stations. Cognitive radios may hide themselves in between the primary users to avoid being charged for using spectrum. To deal with such scenario, a cyclostationary Fast Fourier Transform FFT Accumulation Method (FAM) has been used to develop a new strategy for channel users recognition. Channel users are tracked according to the changes in their signal parameters for instance modulation techniques. The Matlab simulation runs two signals transmitted on 805 MHz channel. Obtained spectral correlation density functions show successful recognition between different signals.

EĂnjĂƌ͘ZĂĚŚŝΛďƌƵŶĞů͘ĂĐ͘ƵŬ AbstractͶ/Ŷ ƚŚŝƐ ƉĂƉĞƌ͕ Ă ŶƵŵďĞƌ ŽĨ ƐƉĞĐƚƌƵŵ ƐĞŶƐŝŶŐ ƐĐŚĞŵĞƐ ŝŵƉůĞŵĞŶƚĂƚŝŽŶ ŝŶ ƵůƚƌĂ ǁŝĚĞďĂŶĚ ĂŶĚ ŽŐŶŝƚŝ|Ğ ƌĂĚŝŽ ĐŽŵƉŽŶĞŶƚ ;ht Ͳ ZͿ ƵŶĚĞƌ ĚŝĨĨĞƌĞŶƚ ĨĂĚŝŶŐ ƐĞƚƚŝŶŐƐ ĐŽŶĚŝƚŝŽŶ ĂƌĞ ƐƚƵĚŝĞĚ͘ dŚĞ ƐĞŶƐŝŶŐ ƉĞƌĨŽƌŵĂŶĐĞ ŽĨ ĚŝĨĨĞƌĞŶƚ ĚĞƚĞĐƚŽƌƐ ŝƐ ĐŽŵƉĂƌĞĚ ŝŶ ĐŽŶĚŝƚŝŽŶƐ ŽĨ ƉƌŽďĂďŝůŝƚLJ ŽĨ ŵŝƐƐ ĚĞƚĞĐƚŝŽŶ ĐƵƌ|ĞƐ͘ EƵŵĞƌŝĐĂůůLJ ƐŝŵƵůĂƚŝŽŶ ƌĞƐƵůƚƐ ĂƌĞ ƐŚŽǁŶ ƚŚĂƚ ƚŚĞ ƐĞůĞĐƚŝŽŶ ŽĨ ĚĞƚĞĐƚŽƌ ƌĞůLJ ŽŶ ƚŚĞ ƐĐĞŶĂƌŝŽ͕ ƚŚĞ ĚĞƚĞĐƚŽƌ ƌĞƋƵŝƌĞŵĞŶƚƐ ĂŶĚ ŽŶ ƚŚĞ ŽďƚĂŝŶĂďůĞ ƉƌŝŽƌ ŬŶŽǁůĞĚŐĞ͘ ůƐŽ ƐŝŵƵůĂƚŝŽŶ ƌĞƐƵůƚƐ ĐĂŶ ďĞ ƐŚŽǁŶ ƚŚĂƚ ŝƚ ŝƐ ƉŽƐƐŝďůĞ ƚŽ ĂĐŚŝĞ|Ğ ďĞƚƚĞƌ ĚĞƚĞĐƚŝŽŶ ƉĞƌĨŽƌŵĂŶĐĞ ŝŶ ĐŚŽŽƐŝŶŐ ĨƌĞƋƵĞŶĐLJ ĐŚĂŶŶĞů ďLJ ĞdžƉůŽŝƚŝŶŐ ƚŚĞ ĂƵƚŽĐŽƌƌĞůĂƚŝŽŶ ŝŶ ĐLJĐůŽƐƚĂƚŝŽŶĂƌLJ ĚĞƚĞĐƚŝŽŶ ĂůŐŽƌŝƚŚŵ͘ KeywordsͶ Spectrum sensing methods, UWB system, cognitive radio technique.

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