[PDF] Top 20 Optimal Power Allocation and Power Constraint in OFDM-Based Cognitive Radio Systems

... the OFDM modulation mode is used both in CUs and LU (the attenuation characteristic of power spectral density side lobe), the LU and CUs both have interferences on each ...by Cognitive User's Signal ... See full document

... much power each CR user’s subcarrier should have, so that the transmission rate of CR users could be ...an optimal power allocation scheme using Lagrange ...total power ... See full document

... transmission power constraint, the interference power constraint, and the minimum through- put constraint are ...The optimal transmission power in each time slot can be ... See full document

... sensing based spectrum sharing for cognitive radio ...transit power based on the sensing ...transmit power based on its own ...interference power constraint ... See full document

... transmit power of each user is the main source of interference to other ...the power control is necessary and naturally one of the key technologies of this ...A power allocation strategy is ... See full document

... and power allocation is proposed for SU to maximize its ...the optimal WSR ...used based on the dual optimization ...are power allo- cation and subcarrier pair scheme, and second part ... See full document

... the allocation of the frequency bands is constant, that is, the entire fre- quency band is managed by a single committee (FCC) and each band provides a specific kind of ...constant allocation of the ... See full document

... different systems to each other is a high priority constraint for throughput maximization in CR ...LDPC-coded OFDM systems while users are experiencing the mutual inter- ...in cognitive ... See full document

... and power allocation in the CR relay ...and power allocations with AF or DF relaying protocol to (1) maxi- mize the sum network throughput; (2) minimize the total transmit power of the CR ... See full document

... in spectral efficiency as compared to direct transmission. Fortunately, two-way relaying transmission has been pro- posed to overcome the spectral efficiency loss [6–8]. Combining cooperative relaying and ... See full document

... consider cognitive radio network in which two cognitive radio sources communicate with two cognitive destinations via a relay ...rate. Based on the availability of the spectrum ... See full document

... design optimal FFR schemes, and they solved the interference coordin- ation problem ...tioned. Based on such resource planning, the objective of the resource allocation scheme in [17] is to maximize ... See full document

... and power allocation such that the secondary user’s throughput is maximized on the condition that it satisfies the primary user’s target ...the optimal secondary transmitter uses different licensed ... See full document

... called Cognitive Radio (CR), has emerged in the field of wireless communication, to alle- viate the imbalance between spectrum allocation and its use ...software-defined radio (SDR), a CR node ... See full document

... and power constraint on cognitive us- ers is ...joint power control and spectrum allocation algorithm based on particle swarm optimization to obtain the global optimal ... See full document

... The power has to be assigned to CR subcarriers such that the transmission rate of CR user can be maximized while all +1(total power constraint from ...the optimal algorithm comes from the fact ... See full document

... wireless radio system, chaos communications and system theory, digital and array signal and array processing, systolic and VLSI algorithms, architectures and systems, radar system, and ...Radar ... See full document

... wireless OFDM downlink system consisting of one cognitive base station (CBS) and k ...The OFDM system bandwidth is assumed to be equally divided into n (n ≥ k) ...channel power gain on each ... See full document

... the power allocated to the subcarrier as well as the spectral distance between particular subcarrier ...intelligent radio resource man- agement is needed for the dynamic allocation of radio ... See full document

... time. Cognitive radio (CR) [2–4], which is an intelligent wireless communication system capable of learning from its radio environment and dynamically adjust- ing its transmission characteristics ... See full document