Abstract—This work proposes a reduced complexity secure cooperative cognitive radio spectrum sensing algorithm for wideband systems. The main goal of the proposed algorithm is to reduce the cognitive radio receiver hardware complexity by distributing the sensing work among the trustful nodes only. Each cognitive radio node uses its local sensing matrix, which is a part of a global sensing matrix at the fusion center, to sense the wideband analog signal. The fusion center selects and rearranges the compressed data from the trustful ...

Abstract: Cooperative wide-band spectrum sensing has been considered to enable cognitive radio operation of wireless regional area networks (WRAN) in the UHF and VHF TV broadcasting bands. In this paper, cooperative compressed spectrum sensing is considered to enable fast sensing of the wide-band spectrum. The speed and accuracy of spectrum sensing are improved by further optimization of the compressed sensing receiver, which is done blindly without any prior knowledge of the sensed signal. Enhanced ...

Abstract—This paper proposes a spectrum sensing algorithm for cognitive radio transceivers to save in sampling rates and receiver hardware complexity. The proposed receiver blindly optimizes its compressed sensing sparsifying bases and has improved receiver-operating characteristics. Keywords: Cognitive radio; Compressive sensing; Wavelet Packet; Blind Optimization, Entropy, sub-Nyquist sampling

ABSTRACT In this paper, we propose a reduced complexity secure cooperative cognitive radio spectrum sensing algorithm for wideband systems. The proposed scheme aims to reduce the receiver hardware complexity by minimizing the required sampling rates. The proposed scheme is immune to spectrum sensing data falsification attacks. Each cognitive radio node samples the analog wideband signal from the primary users using an analog-to-information converter and sends the compressed signal to the fusion center that makes a ...

Abstract—Designing efficient spectrum sensing techniques with low power consumption is crucial for the success of cognitive radio (CR). This is particularly challenging when sensing a wideband spectrum due to the high sampling rate required. Compressive sensing (CS) theory states that a signal can be measured at a rate significantly lower than the Nyquist rate and consequently reconstructed from the measurements using an optimization process. The minimum number of measurements required for reliable reconstruction of the sampled ...

في هذا البحث تم إجرائ العديدمن التجارب المعملية على الخرسانة المسلحة حدسثة الصب وفي أجواء المملكة العربية السعودية والمتميزة بالحرارة العاليةنسبيا, وذلك مع الاخذ في الاعتبار الطاقة المفقودة نتيجة الإحتكاك للعينات إثناء عملية الصب, تم إختيار العيناتالخرسانية الحديثة الصب تحت تأثيرالشد المباشر وبطريقة مناسبة لحساب الطاقة اللازمة لإنهيار العينة وذلك بإختلاف زمن الصب, في هذا البحث تم أيضا التعرف على اماكن تركيز الإنفعالاتللعينات الخرسانية الحديثةالصب تحت تأثير الشد المباشر كما تم الوصول بالعينات لما بعد القيم العظمى للإجهاد, وأخيرا تم مقارنة النتائج المعملية مع النتائج النظرية والمستنتجة بطريقة النموزج الضلعي المعدل Modified Lattice Model والذي تم استنتاجه ونشرة من قبل بمعرفة الباحث, وقد لوحظ التطابق الكبير بين النتائج المعملية والنتائج النظرية