Page 256 - From Smart Grid to Internet of Energy

228 From smart grid to internet of energy

TABLE 6.1 Comparison of non-cooperative SS methods

Detection
method Advantages Disadvantages
Energy detection ✓ No prior knowledge required ✖ Poor performance at low
✓ Low computational cost SNR values
Matched filter ✓ Optimum performance ✖ Needs prior knowledge
✓ Low computational cost regarding the PUs
Cyclostationary ✓ Good performance at low ✖ Needs prior knowledge
feature SNR values regarding the PUs
✓ Noise insensitive ✖ High computational cost
characteristic

FIG. 6.14 An example scenario for hidden terminal problem.

shadowing as stated before [16, 64]. An example of hidden terminal problem
based on shadowing is shown in Fig. 6.14.
The cooperative spectrum sensing (CSS) based detection process can be
divided into two categories as centralized and distributed CSS. By using the
diversity gains supplied by various CR devices, the CSS methods can generally
present higher accuracy for the SS process. Even though this type of spectrum
detection ensure performance improvement, the results of this advantage may
cause several drawbacks such as more power consumption, higher system com-
plexity and increased computational complexity [65]. A common control chan-
nel (CCC) is responsible for changing necessary information on the CSS. The