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Energy saving is one of the most investigated problems in wireless networks. In this paper, we introduce two homology based algorithms: a simulated annealing one and a robust one. These algorithms optimize the energy consumption at network level while maintaining the maximal coverage. By using simplicial homology, the complex geometrical calculation of the coverage is reduced to simple matrix computation...
This paper studies the resource allocation for multi-D2D (Device-to-Device) communications in heterogeneous networks with quality-of-service (QoS) guarantees for both cellular and D2D links. To improve the achievable rate of D2D communication and the spectrum utilization, one D2D pair is allowed to reuse multiple cellular spectrum resources. However, this scheme introduces more interference so that...
Crowd sensing is an effective zero-cost method to map physical spatial fields by exploiting sensors already embedded in smartphones. The potentially huge amount of generated data and random measurement positions represent serious challenges to be addressed. In this paper we propose a combined Gaussian process (GP)-State space method for crowd mapping whose complexity and memory requirements for field...
In this paper we present a new multiple access architecture for the uplink in a multi-carrier communications system. We are motivated by the case where the transmitters are low-power, low-complexity devices in a machine-to-machine (M2M) transmission scenario, such as is the case for a widespread sensor network with terrestrial base station or device-to-device relay. Each user transmits using single...
Filter Bank Multi-Carrier (FBMC) with Offset Quadrature Amplitude Modulation (OQAM) has been actively investigated for decades. Now it is also a candidate for 5G air interface waveform. Nevertheless, when it goes to standardization consideration, people still prefer Orthogonal Frequency Division Multiplex (OFDM), in spite of its identified drawbacks for 5G. Such conservative attitude comes from the...
In this paper, a cooperative channel estimation strategy is proposed in multi-cell large scale antenna systems (so-called “massive MIMO”). Based on time-shifted uplink pilot sequences, the strategy can alleviate the performance degradation caused by the pilot contamination. In addition, the truncated conjugate gradient trust region (TCGTR) algorithm is proposed to estimate the channel vectors. The...
The selection of resources, particularly VMs, in current public IaaS clouds is usually done in a blind fashion, as cloud users do not have much information about resource consumption by co-tenant third-party tasks. In particular, communication patterns can play a significant part in cloud application performance and responsiveness, specially in the case of novel latency-sensitive applications, increasingly...
Low-density parity-check (LDPC) codes offer excellent performance at competitive levels of complexity. Short block length LDPC codes avoid the large processing latency incurred by the large block lengths classically considered for this class of codes, making them a potential candidate for next generation wireless communications systems. In this paper, a novel informed dynamic scheduling (IDS) approach...
In this paper, the energy efficiency (EE) of distributed antenna system (DAS) with multiple receive antennas is investigated over composite fading channel that takes the path loss, shadow fading and Rayleigh fading into account. Our aim is to maximize EE which is defined as the ratio of the transmission rate to the total consumed power under the constraints of maximum transmit power of each remote...
Energy efficiency (EE) is considered as a key enabler for the next generation of communication system. Equally, scheduling is an important aspect for efficient and reliable communication in multi-user system. In this paper, we propose a low-complexity green scheduling algorithm for the downlink of orthogonal frequency division multiple access (OFDMA) cellular system when considering that base station...
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