| 1. |
- Lakshmana, Tilak Rajesh, 1980, et al.
(författare)
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Frequency Allocation in Non-Coherent Joint Transmission CoMP Networks
- 2014
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Ingår i: 2014 IEEE International Conference on Communications Workshops, ICC 2014. - 9781479946402 ; , s. 610-615
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Konferensbidrag (refereegranskat)abstract
- In this paper, we study the problem of joint transmission (JT) in coordinated multipoint (CoMP) networks from a new point of view where the system performance is optimized via frequency allocation for 5G small cells. Moreover, we investigate the implementation of hybrid automatic repeat request (HARQ), as an efficient scheme facing the feedback load problem in CoMP setups. The results are obtained for the cases with slow and fast fading conditions. Considering the channel state information (CSI) only at the receiver, we show that at low and medium signal to noise ratios (SNRs) sharing the frequency resources between users outperforms the case when the frequency resources are dedicated under non-coherent JT-CoMP setting. We find that the maximum long term throughput is achieved by either sharing the entire frequency resources between the users or allocating each user in a disjoint dedicated frequency resource. These extreme cases show the best performance in the SNR region of interest. Finally, as demonstrated analytically and numerically, HARQ feedback increases the long term throughput and reduces the outage probability substantially, with an affordable average delay.
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| 2. |
- Leitinger, E., et al.
(författare)
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Multipath-assisted maximum-likelihood indoor positioning using UWB signals
- 2014
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Ingår i: IEEE ICC 2014 Workshop on Advances in Network Localization and Navigation (ANLN). - 9781479946402 ; , s. 170-175
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Konferensbidrag (refereegranskat)abstract
- Multipath-assisted indoor positioning (using ultrawideband signals) exploits the geometric information contained in deterministic multipath components. With the help of a-priori available floorplan information, robust localization can be achieved, even in absence of a line-of-sight connection between anchor and agent. In a recent work, the Cramér-Rao lower bound has been derived for the position estimation variance using a channel model which explicitly takes into account diffuse multipath as a stochastic noise process in addition to the deterministic multipath components. In this paper, we adapt this model for position estimation via a measurement likelihood function and evaluate the performance for real channel measurements. Performance results confirm the applicability of this approach. A position accuracy better than 2.5 cm has been obtained in 90% of the estimates using only one active anchor at a bandwidth of 2GHz and robustness against non-line-of-sight situations has been demonstrated.
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| 3. |
- Li, Zuxing, et al.
(författare)
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Parallel Distributed Neyman-Pearson Detection with Privacy Constraints
- 2014
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Ingår i: Proceedings of the IEEE International Conference on Communications (ICC) 2014 Workshop. - 9781479946402 ; , s. 765-770
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Konferensbidrag (refereegranskat)abstract
- In this paper, the privacy problem of a parallel distributed detection system vulnerable to an eavesdropper is proposed and studied in the Neyman-Pearson formulation. The privacy leakage is evaluated by a metric related to the Neyman-Pearson criterion. We will show that it is sufficient to consider a deterministic likelihood-ratio test for the optimal detection strategy at the eavesdropped sensor. This fundamental insight helps to simplify the problem to find the optimal privacy-constrained distributed detection system design. The trade-off between the detection performance and privacy leakage is illustrated in a numerical example.
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| 4. |
- Seifi, Nima, 1981, et al.
(författare)
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Joint transmission mode and tilt adaptation in coordinated small-cell networks
- 2014
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Ingår i: 2014 IEEE International Conference on Communications Workshops, ICC 2014. - 9781479946402 ; , s. 598-603
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Konferensbidrag (refereegranskat)abstract
- We study downlink transmission in a wireless network consisting of small-sized cells, denoted as a small-cell network (SCN). We consider multi-antenna base stations (BSs) and single-antenna users, BS coordination, 3D antenna patterns, and fair scheduling. We investigate the impact of the elevation angle of the BS antenna pattern, denoted as tilt, on the performance of the considered SCN when employing either a conventional uncoordinated transmission mode or a fully coordinated transmission mode. Using the results of this investigation, we propose a novel hybrid-mode transmission technique that can achieve a performance comparable to that of a fully coordinated transmission but with a significantly lower complexity and signaling requirement. The main idea is to divide the coverage area into two so-called vertical regions and jointly adapt the transmission mode and the tilt at the BSs when serving each region. A fair scheduler is used to share the time-slots between the vertical regions and among the users in each region.
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| 5. |
- Wu, Jian, et al.
(författare)
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Base station sleeping and power control for bursty traffic in cellular networks
- 2014
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Ingår i: 2014 IEEE International Conference on Communications Workshops, ICC 2014. - : IEEE. - 9781479946402 ; , s. 837-841
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Konferensbidrag (refereegranskat)abstract
- In this paper, we study sleeping and power control of a single-cell cellular network with bursty traffic. The base station (BS) sleeps whenever the system is empty, and wakes up when N users are assembled. The service capacity of the BS in the active mode is controlled through its transmitting power. The total power consumption and average delay for bursty traffic that follows the Interrupted Poisson Process (IPP) are analyzed. We discuss when the BS should sleep and the impact of traffic burstiness on it. The impact of the sleeping threshold and the transmitting power on the system performance is also investigated. The numerical results show that given the average traffic load, the more bursty the traffic is, the less the total power is consumed, while the delay performance of the more bursty traffic is better only under certain circumstances.
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