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This paper aims to improve capacity in multi-hop OFDM system with non-regenerative relaying based on power allocation. The capacity model is presented, power allocation is analyzed based on the subsignal tuned to subcarrier of OFDM. Power allocation is decomposed to two subproblems. The first subproblem is the optimal power allocation to every hop of subsignal, when the power of each subsignal is...
In this paper, a joint power and subcarrier allocation scheme in single-cell uplink OFDMA systems is proposed based on game theory. Our goal is to maximize the power efficiency of each user under peak power constraint. For the purpose, a utility function is designed which can enhance the rate per joule of energy consumed greatly, and the existence and uniqueness of the Nash equilibrium of the function...
In this letter, mutual interference considered power and spectrum allocation, bit loading is considered in OFDM-based cognitive networks, which is modeled as a multiuser water-filling technique maximizing the capacity of secondary system.
This paper investigates effects of pilot assisted channel estimation on dynamic resource allocation in a multiuser orthogonal frequency division multiplexing (OFDM) system. The channel estimation is done in each OFDM symbol through least-squared error (LSE) or minimum mean-squared error (MMSE) algorithm. The performance of each of these algorithms is evaluated through computer simulations. The maximal...
In this paper, we consider a new channel probing scheme for opportunistic scheduling in the uplink of orthogonal frequency division multiplexing (OFDM)-based wireless systems. To reduce signaling overhead for the probing, we consider a two-step channel probing process; called pre-probing and mainprobing. Good subchannels are first estimated through the pre-probing process using a probing signal transmitted...
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