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Communication system design becomes more complicated due to excessive increase of number of users. Systems need to address this load, while providing acceptable levels of Quality of Service (QoS). Additionally, user expectations, quantified via Quality of Experience (QoE), need to be addressed. QoE is calculated on the application layer, where end users interact with the system. As well as user expectations,...
Transmit antenna selection (TAS) schemes have been adopted in various communication systems to provide improved performance with relatively reduced complexity. The quality-of-service (QoS) in these systems depends on the availability of perfect channel state information (CSI). In practice, it is difficult to acquire perfect CSI, since it may get outdated due to feedback process. In this paper, we...
This paper presents an analysis of the achievable effective capacity of a dual-hop network with buffer-aided source and relays using a concurrent relay selection protocol. The source and relays are subject to constraints on the maximum allowable delay violation probabilities. The effective capacity under such statistical delay constraints is derived as a function of the source and relay signal-to-noise...
In TD-LTE-A system, the objective of conventional non-codebook beamforming algorithms is to maximize sum capacity to accommodate more users. However, fairness among users is not considered by these algorithms, and the performance of users with poor channel quality will always be bad. To relax the fairness requirement in resource allocation, this paper first introduces two parameters of user satisfaction...
We present a new co-operative scheduling approach which provides not only more reliability but also higher effective capacity. Cooperation region is defined for active handoff users between two base stations (BSs) based on the user quality-of-service (QoS) requirements. A proper definition of co-operation or handoff region, where the user can be scheduled in a cooperative manner from more than one...
We propose a primary traffic based multihop routing with the cooperative transmission (PTBMR-CT) algorithm that enlarges the hop transmission distances to reduce the number of cognitive receivers on the route from the cognitive source (CS) to the cognitive destination (CD). In each hop, from the cognitive nodes in a specified area depending on the status of the primary traffic, the cognitive node...
One of the major challenges in cognitive radio networks is to maintain the quality of service (QoS) for secondary transmissions while ensuring the protection of primary users PUs); the latter requirement is normally enabled through inband spectrum sensing. To maintain QoS of secondary traffic, a secondary user (SU) has to quickly switch to another empty spectrum band when a PU returns to its currently...
Wireless Personal Area Networks (WPANs) are used for a wide variety of applications. Earlier WPANs, like Bluetooth, offer data rates only for low rate communication. Nowadays, consumer electronic devices have high demands on communication systems, e.g. for high definition video transmission. Users expect future WPANs to act like wired systems by means of reliability, that is, packet loss and distortion...
The lossy nature of wireless communication leads to many challenges while designing multihop networks. As an integral part of reliable communication in wireless networks, effective link estimation is essential for routing protocols. Recent studies have shown that link reliability-based metrics like ETX have better performance than traditional metrics such as hop count or latency. Usually, such metrics...
In this paper, the soft decision decoding method using CSI (channel state information) for DCM that is used for high data rate (320, 400, 480 Mbps) in MB-OFDM (multi-band orthogonal frequency division multiplexing) system is investigated. OFDM based on UWB system has been proposed by the MBOA to provide very high data rate wireless communication. And CSI can be used in the soft-decision process to...
In this paper we derive optimal power allocation scheme that minimizes bit error rate (BER) while satisfying the average power constraint and peak to average power ratio (PAPR) constraint (which translates to minimizing the PAPR). The power allocation is done in space and time for multiple-input single-output (MISO) systems over Rayleigh flat fading channels assuming perfect channel state information...
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