On effective rate and energy detection based spectrum sensing over cascaded FTR fading channel

• Published in: International journal of electronics and communications 2021-08, Vol.138, p.153862, Article 153862
• Main Authors: Kumar, Rahul, Soni, Surender Kumar
• Format: Article
• Language: English
• Subjects: Cascaded FTR; Cognitive radio; Diversity; Effective rate; Energy detection; Fading; Spectrum sensing
• ISSN: 1434-8411; 1618-0399
• DOI: 10.1016/j.aeue.2021.153862

The detrimental effects of multipath fading and multi-hope/keyhole propagation of millimetre–wave (mm) on the effective rate (ER) and the detection performance of energy detector (ED) have been investigated in this article. Cascaded fluctuating two ray fading model have been used to characterize the mm-wave propagation environment. Utilizing probability density function-based approach, novel closed form mathematical expressions for ER, average detection probability (ADP) and average area under the receiver operating characteristics (AUC) for the single and multi-antennae receiver-based system have been derived. To this end, novel mathematical expression for instantaneous signal to noise ratio (SNR) at the output of maximal ratio combiner (MRC) is also obtained. Subsequently obtained results are employed to compute performance metrics for the collaborative spectrum sensing where each individual receiver consists of multiple antennae. Obtained expressions are useful to evaluate ER and ED performance over different fading scenarios impaired due to cascading effects, and also helps to maintain ER versus ADP trade-off by exploiting time-bandwidth product relation. Analysis shows a considerable degradation in ER and ADP as the channel cascading effect increases and employing diversity reception is useful to overcome the degraded performance. In the end, Monte-Carlo simulations are provided to validate the numerical accuracy of theoretically derived expressions.