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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...
This paper proposes a novel integral frequency offset (IFO) estimation method for orthogonal frequency-division multiplexing (OFDM) systems, which examines the phase changes of synchronization signals in frequency domain. It is shown that the new method provides excellent IFO estimation performance with very low computational complexity.
The conventional design of channel equalizer for IEEE 802.11a wireless local area network (WLAN) does not consider the different requirements of the adopted modulation schemes. In this paper, an adaptive-modulation-oriented channel equalizer and its VLSI architecture are developed. We analyze the different computation efforts of the modulation schemes and consider the system-level adaptive-modulation...
In this paper, we present two efficient cyclicity restoration (CR) schemes for orthogonal frequency-division multiplexing (OFDM) systems to combat intersymbol interference (ISI) and intercarrier interference (ICI) when the channel impulse response is longer than cyclic prefix (CP). First, we introduce a parallel scheme using the tentative signals generated in time domain, which provides low computational...
In this paper, a new low complexity equalization scheme is presented to mitigate inter-symbol interference (ISI) and inter-carrier interference (ICI) for orthogonal frequency division multiplexing (OFDM) systems with insufficient cyclic prefix (CP). After conventional decision-feedback ISI cancellation, the proposed scheme cancels ICI in frequency domain. By using tentative hard decisions, the new...
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