Journal ArticleDOI
Opportunistic Multiple Relay Selection with Diverse Mean Channel Gains
Chia-Hao Yu,Olav Tirkkonen +1 more
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TLDR
This work considers two relay selection methods and provides an efficient algorithm for selecting an optimal set of active relay nodes, with a cardinality constraint on the set, for proactive relaying with diverse mean channel gains on different links.Abstract:
We consider multiple relay selection for proactive relaying with diverse mean channel gains on different links. We consider a variable rate system where the transmission rate is maximized based on an end-to-end (e2e) channel gain. We consider two relay selection methods and provide an efficient algorithm for selecting an optimal set of active relay nodes, with a cardinality constraint on the set. An approximation to the statistical behavior of the e2e performance for the two relay selection methods is derived. Our results show benefits from using multiple relays when different links exhibit different mean channel gains.read more
Citations
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Journal ArticleDOI
Joint User Grouping and Linear Virtual Beamforming: Complexity, Algorithms and Approximation Bounds
TL;DR: In this article, the problem of optimally selecting a subset of nodes from potentially a large number of candidates to form a virtual multi-antenna system, while at the same time designing their joint linear transmission strategies is considered.
Journal ArticleDOI
Energy-Efficient Dynamic Resource Allocation for Opportunistic-Relaying-Assisted SC-FDMA Using Turbo-Equalizer-Aided Soft Decode-and-Forward
TL;DR: This paper proposes two joint dynamic resource allocation (JDRA) schemes by assuming that the pilot-aided channel-quality information (CQI) of all the users may be exchanged and demonstrates that the proposed FHQA JDRA schemes can achieve an energy reduction gain of 91% for a single-antenna base station (BS) receiver and up to 7.4% when considering the energy consumption due to CQI exchange among relays.
Proceedings ArticleDOI
Enhancing Cellular Performance via Vehicular-based Opportunistic Relaying and Load Balancing
TL;DR: The results suggest that 3-10x throughput gains are possible along with significant improvements in user rate fairness depending on the system parameters, and near-optimal network utility maximization formulation is developed.
Journal ArticleDOI
An Efficient Clustering Algorithm for Device-to-Device Assisted Virtual MIMO
TL;DR: This paper investigates a special case with a single source and analytically derive an upper bound on the average spectral efficiency of the VMIMO system, and proposes an optimal greedy algorithm that achieves this bound.
Posted Content
An Efficient Clustering Algorithm for Device-to-Device Assisted Virtual MIMO
TL;DR: In this paper, the authors proposed an efficient algorithm to cluster each source with a subset of available relays to form a VMIMO system under a limited feedback assumption, where single antenna MDs are randomly distributed on a 2D plane according to a Poisson point process.
References
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Journal ArticleDOI
Cooperative diversity in wireless networks: Efficient protocols and outage behavior
TL;DR: Using distributed antennas, this work develops and analyzes low-complexity cooperative diversity protocols that combat fading induced by multipath propagation in wireless networks and develops performance characterizations in terms of outage events and associated outage probabilities, which measure robustness of the transmissions to fading.
Journal ArticleDOI
User cooperation diversity. Part I. System description
TL;DR: Results show that, even though the interuser channel is noisy, cooperation leads not only to an increase in capacity for both users but also to a more robust system, where users' achievable rates are less susceptible to channel variations.
Journal ArticleDOI
Distributed space-time-coded protocols for exploiting cooperative diversity in wireless networks
J.N. Laneman,Gregory W. Wornell +1 more
TL;DR: This work develops and analyzes space-time coded cooperative diversity protocols for combating multipath fading across multiple protocol layers in a wireless network and demonstrates that these protocols achieve full spatial diversity in the number of cooperating terminals, not just theNumber of decoding relays, and can be used effectively for higher spectral efficiencies than repetition-based schemes.
Journal ArticleDOI
User cooperation diversity. Part II. Implementation aspects and performance analysis
TL;DR: It is illustrated that, under all scenarios studied, cooperation is beneficial in terms of increasing system throughput and cell coverage, as well as decreasing sensitivity to channel variations.
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