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Opportunistic spectrum access is an important issue in cognitive radio systems. In this paper, we propose a distributed opportunistic spectrum access scheme based on sequential channel-sensing in decentralized CRN (cognitive radio network). Different from the traditional spectrum sensing scheme, the scheme proposed allows a secondary users to sense many channels one by one sequentially in a slot....
In the cognitive radio networks, the cognitive user must scan the multi-channel to acquire an idle channel before its cognitive transmission. If the sensing capability is limited, the user must sense the multi-channel one by one. So the sensing order is very crucial to the realization of maximum throughput. In this paper, we aim to find the optimal wideband sensing order in polynomial time which is...
The number of cooperative sensors to use is a compromise between sensing performance and resources usage efficiency. The definition of the optimal cooperative sensor set is given out firstly and then a greedy selection algorithm for the optimal cooperative sensor set is proposed which can use fewest cooperative sensors to maximize the resources usage efficiency, while still having enough for the sensing...
The problem of sensor set selection for cooperative spectrum sensing in cognitive radio networks is considered in this paper. The cooperative gain of the newly added cooperative sensor decreases and converges to zero as the number of cooperative sensors increases, but the consumption of system resources grows approximately linearly with the number of cooperative sensors, therefore, the number of cooperative...
The number of sensors to use for cooperative sensing is a compromise between sensing performance and consumption of system resources. Firstly, the definition of optimal sensor set (OptSS) is given out. Then an optimal selecting method of OptSS is acquired. Lastly, a sub optimal adaptive selecting algorithm of OptSS based on greedy with a lower complexity is proposed, which not only obtains the near-optimal...
Although the method of cooperative spectrum sensing can greatly improve the sensing performance, the consumption of system resources will increase as the number of cooperative sensors increases, therefore, the number of cooperative sensors to use is a compromise between sensing performance and consumption of system resources. Firstly, based on the expression for the probability of detection, a sensor...
A cognitive scenario similar to BSS (basic service set) in CogMesh network is considered. Traditional MR (mesh router) is reconstructed into multi-transceiver structure, which called CMR (cognitive mesh router). CMR can allocate vacant spectrum bands for SMCs (secondary mesh client), which access the CMR with one hop. Besides, ESA algorithm is proposed according to the spectrum scenario based on the...
In this paper, power control problem in cognitive user is modeled as a non-cooperative game model. To improve the cognitive users' performance, this paper presents a new pricing function based on double-interference punishment (DIP) for non-cooperative power control game in a CDMA cognitive radio network. The model reduces the minimum Signal to Interference plus Noise Ratio (SINR) satisfied the requirement...
The new dynamic spectrum environment in cognitive radio networks necessities novel routing protocols which should be spectrum-aware, self-configured, high-adaptive and robust to match the dynamic nature of Cognitive Radio Networks (CRN) and exploit the available spectrum efficiently. In this paper, we present ASAR, which is a biologically inspired routing solution for CRN. In our routing algorithm,...
Wideband spectrum sensing is urgently in need for cognitive communication with wide spectrum range. When the cognitive user need to communication and when the exact primary user is found return, how to catch a new spectrum hole as fast and accurate as possible is becoming an intractable issue for the wideband cognitive user. In this paper, we propose a wideband sensing scheme for a cognitive user...
Traffic driven based load balancing routing scheme in CogMesh network is proposed. SMC (secondary mesh client) accessing to CMR (cognitive mesh router) using Ad Hoc way is considered in the paper. A novel routing metric was proposed to describe the load state of a path, which was suitable for traffic demand. Choosing a light-loaded route and a light-loaded link guarantees a lower end-to-end delay...
The SINR balancing problem involving joint beamforming and power control is considered in the cognitive radio network, wherein the single-input multi-output multiple access channels are assumed. Subject to two sets of constraints: the interference temperature constraints of primary users and the peak transmission power constraints of cognitive users, a low-complexity joint beamforming and power control...
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