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This paper focuses on uplink transmission of OFDMA system in smart grid with heterogeneous traffic. The subcarrier and power allocation problem is formulated to maximize the throughput while maintaining the delay-constrained (DC) user rate and ensuring the NDC users fairness ratios. Considering these constraints, we propose two reasonable algorithms. The first is based on dual decomposition (DD) scheme,...
In recent years, femtocells, which could enhance the indoor coverage, have attracted widely attention. The interference among femtocells is not ignorable when the deployment is extremely dense. In this paper, a novel component carrier selection scheme, which includes two algorithms, i.e. BCCS (Basic Component Carrier Selection) algorithm and ECCS (Enhance Component Carrier Selection) algorithm, is...
The effective throughput of multiple-input–single-output (MISO) systems communicating over both independent and identically distributed (i.i.d.) and independent and nonidentically distributed (i.n.i.d.) – fading channels is investigated under delay constraints. New analytical expressions are derived for the exact effective throughput of both channels. Moreover, we present tractable closed-form...
In this paper, we study the two-way relay channel (TWRC) with multi-user (MU), each of which exchanges information with its partners via a common access relay. All users are divided into two groups. Every user exchanges messages with each user in the other group. The two communication terminals use different modulation schemes. We term this system an asymmetric multi-pair two-way relay X channel (TWRXC),...
In this paper, an error-prone cooperative retransmission strategy (E-CRS) is proposed for wireless networks. In E-CRS, when a receiver can not receive a frame correctly, the retransmission is performed by a cooperative node that overhears the packet successfully, rather than by original source. The throughput of the proposed scheme is analyzed and evaluated in error-prone and no collision channel...
A hybrid system consisting of a cellular network and a device-to-device (D2D) network is considered in this paper where the D2D users operate in an underlay mode and reuse the spectrums with the cellular users. Most researches focus on reusing the uplink spectrums but how to share the downlink frequency bands is seldom addressed. To share the downlink spectrums and avoid the interference to the primary...
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