[PDF] Top 20 Optimal Power Allocation and Power Control Parameter in OFDM Based Cognitive Radio Systems

... techniques. Cognitive radio (CR) has been widely accepted as an effective method to improve wireless spectrum utilization ...The cognitive users (CUs) can communicate with each other by automatically ... See full document

... located power need to be adjusted carefully, other CR subcarriers can be allocated full power as they introduce negligible interference to PU ...full power (see Figure ...capacity. Based on ... See full document

... Though the above solution looks like water-filling, it is different from the conventional water-filling technique in the fact that each SU sub-carrier has a different water level. We would like to note here that the ... See full document

... multi-carrier systems are considered as prime candidates for use in the Cognitive Radio (CR) ...to OFDM- based CR to compensate for such a low ...of power allo- cation in ... See full document

... a power allocation policy with peak power constraints is proposed, and the target throughput max- imization problem is solved by recursion machinery and geometric water-filling ...transmission ... 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 ... See full document

... Cognitive Radio(CR) is one kind of intelligent wireless device, which is able to adjust its transmission parameters, such as transmit power and transmission frequency band, based on the ... 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

... and power allocation at the secondary transmitter, which aims to achieve the maximum possible throughput for the secondary ...The optimal secondary transmitter acts as a relay for the primary user by ... See full document

... the optimal pricing scheme. Therefore, a novel price-based power control algorithm was presented in [18] to find the optimal price for each ...game power control model was ... See full document

... was based on spatially sparse precoding [18–20], which formulated the achievable rate optimization problem as a sparse, ap- proximation problem and solved it by the orthogonal matching pursuit (OMP) algorithm to ... See full document

... system, radio resources can be effectively reused by cognitive radio networks (CRNs), where a lot of secondary users (SUs) are able to access the spectrum of primary users ...the optimal ... 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

... Cognitive radio which enables the use of spectrum when such spectrum is inactive is proposed as a solution to solving the spectral ...Optimization based detection techniques such as iterative ... 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

... 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

... 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

... coverage extension without large energy consumption [4]. Traditional one-way relay transmission has a 1/2 spectral efficiency loss than direct transmission, which is induced by half-duplex relay nodes [5]. In other ... See full document

... more radio systems in M2M communication, including unlicensed systems operating in the industrial, scientific, and med- ical (ISM) frequency band, electronic equipment, and domestic ... See full document

... A Cognitive radio (CR) network is a technology in which a frequency band used by one or multiple primary users in a primary network can be operated by a secondary user’s network which consists of one or ... See full document