Cognitive radio network with coordinated multipoint joint transmission

Abstract

Cognitive radio (CR) is considered to be a promising technology for future wireless networks to make opportunistic utilization of the unused or underused licensed spectrum. Meanwhile, coordinated multipoint joint transmission (CoMP JT) is another promising technique to improve the performance of cellular networks. In this paper, we propose a CR system with CoMP JT technique. We develop an analytical model of the received signal-to-noise ratio at a CR to determine the energy detection threshold and the minimum number of required samples for energy detection-based spectrum sensing in a CR network (CRN) with CoMP JT technique. The performance of energy detection-based spectrum sensing under the developed analytical model is evaluated by simulation and found to be reliable. We formulate an optimization problem for a CRN with CoMP JT technique to configure the channel allocation and user scheduling for maximizing the minimum throughput of the users. The problem is found to be a complex mixed integer linear programming. We solve the problem using an optimization tool for several CRN instances by limiting the number of slots in frames. Further, we propose a heuristic-based simple channel allocation and user scheduling algorithm to maximize the minimum throughput of the users in CRNs with CoMP JT technique. The proposed algorithm is evaluated via simulation and found to be very efficient.

Performance Improvement of Next-Generation Network with Cognitive Radio Network and Coordinated Multipoint Joint Transmission

“…The TAT is being improved with the inclusion of the Coordinated Multipoint Joint Transmission technique to Cognitive Radio Network, and this is going to be explained with the simulation results in the coming section [7].…”

“…This technique avoids interference between different SU nodes. This technique is being implemented for the three different environments and the results are being discussed in the next section [7].…”

“…Joining these two technologies, according to their functionality explained in section III, is going to improve the values of SINR because it is being implemented on a network having a strong backbone and architecture that is Cognitive Radio Network, alongside a technology that is proven to be efficient in terms of overall information sharing and throughput. The combination of Cognitive Radio Network and Coordinated Multipoint Joint Transmission is promising to give better results in terms of both throughput and SINR, and the effect of the three different environments on this is to be discussed the next section [7].…”

“…Both The main problem in the JT technique is the synchronization of all the distant sites, multi-cell channel estimation, feedback of the channel state information (CSI) and the synchronous exchange of data. However, using the CoMP JT in CRN has a significant impact which is the increase of the Signal to Interference plus Noise Ratio (SINR) [7].…”

Millimeter‐wave signal generation and transmission to multiple radio access units by employing nonlinearity of the optical link

“…In centralized CoMP architecture, resource management and signal processing tasks of small cells or RAUs can jointly be done at the central unit (CU), where RAUs act as the basic elements of CoMP architecture, as shown in Figure . By centralizing the processing tasks at the CU, complex RAUs may be simplified to low‐cost and energy‐efficient RAUs.…”