Full-Filling Subcarrier Power Allocation in OFDMA-Based Cognitive Radio Systems
نویسندگان
چکیده
منابع مشابه
Optimization of Subcarrier and Power Allocation in Uplink OFDMA Systems
The allocation of subcarriers and power to users is an important issue for exploiting the advantages of OFDMA systems. The main objective of the traditional OFDMA uplink resource allocation focuses on two aspects: one is to maximize the transmission rate of each user, the other is to minimize power. In this paper, we proposed the joint subcarrier and power allocation in the uplink of an OFDMA s...
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An optimal subcarrier allocation algorithm is proposed for orthogonal frequency division multiple access systems over Rayleigh fading channels with channel state information feedback. The transmitted orthogonal frequency division multiple access frame is divided into groups called subchannels according to the detected number of users at the base station. The pilots are reduced for the stable su...
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متن کاملOptimal Subcarrier Power Allocation in OFDM Based Cognitive Radio Networks by Using Gradient Based Methods
The Power allocation in Orthogonal Frequency Division Multiplexing (OFDM)-based cognitive radio networks is designed by gradient based method. The gradient based method in which the power allocated between subcarriers by considering the interference constraint, capacity of CR users and channel gain. Utilize the gradient based descent approach to allocate power to subcarriers in Cognitive Radio ...
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This letter focuses on uplink transmission in OFDMA systems. A subcarrier and power allocation problem is formulated that maximizes the throughput of OFDMA uplink systems while satisfying each user’s power constraints. A greedy algorithm known to be the most efficient algorithm for this problem can provide a high quality near-optimal solution, but has the disadvantage of incurring a long comput...
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ژورنال
عنوان ژورنال: Wireless Engineering and Technology
سال: 2014
ISSN: 2152-2294,2152-2308
DOI: 10.4236/wet.2014.51002