On the Sum-Rate of Opportunistic Beamforming Schemes with Multiple Antennas at the Receiver

Bosisio, R.; Spagnolini, Umberto

doi:10.1109/icc.2007.178

Cited by 9 publications

(7 citation statements)

References 9 publications

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“…The figure clearly shows that the proposed beam SC requires almost one fourth the user population in order to obtain a certain performance compared to single antenna MTs. This confirms that SC represents an inherent form of multiuser diversity so that the degrees of freedom in the maximum selection increases from K to K· N R [7].…”

Section: Performance Evaluationsupporting

confidence: 80%

“…Thus, the benefits of opportunistic beamforming are more evident when the number of users is large. To further improve the data rates of multiuser diversity systems, especially for reasonable user populations, the authors in [6], [7], [8], and [9] consider multi ple antenna MTs with different combining techniques ranging from the simple antenna selection combining (SC) to the more sophisticated equal gain combining (EGC), maximum ratio combining (MRC), and optimum combining (OC). However, complex architectures including multiple receive antennas are often prohibitive in MTs due to implementation complexity and size restrictions.…”

Section: Introductionmentioning

confidence: 99%

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Enhanced selection combining for compact single RF user terminals in multiuser diversity systems

Tsakalaki

Alrabadi

Papadias³

et al. 2010

21st Annual IEEE International Symposium on Personal, Indoor and Mobile Radio Communications

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The downlink performance of systems exploiting multiuser diversity has been shown to improve by using multiple antenna receivers and diversity combining techniques. However, the cost and power restrictions of the user mobile terminals prohibit the use of multiple antennas whereas the size limitations can result in correlated and coupled receive antenna elements downgrading the effectiveness of the applied schemes. In this paper, we propose a simple beam selection combining (SC) technique using a miniaturized single radio receive antenna system assisted by low cost parasitic antennas. The system is optimized for both antenna efficiency and diversity thus made ca pable of forming four practically un correlated beam patterns. The computer simulations show that the proposed beam SC technique outperforms classical antenna SC as well as a previously reported beam combining approach in terms of the average throughput especially for small user populations.

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Section: Performance Evaluationsupporting

confidence: 80%

Section: Introductionmentioning

confidence: 99%

Enhanced selection combining for compact single RF user terminals in multiuser diversity systems

Tsakalaki

Alrabadi

Papadias³

et al. 2010

21st Annual IEEE International Symposium on Personal, Indoor and Mobile Radio Communications

View full text Add to dashboard Cite

show abstract

“…Thus, the benefits of OB are more evident when the number of users is large. To further improve the data rates of multiuser diversity systems, especially for reasonable user populations, the authors in [6][7][8][9] consider multiple antenna UTs with different combining techniques ranging from the simple antenna selection combining (SC) to the more sophisticated equal gain combining (EGC), maximum ratio combining (MRC), and optimum combining (OC). However, complex architectures including 2 International Journal of Antennas and Propagation multiple receive antennas are often prohibitive in UTs due to implementation complexity and size restrictions.…”

Section: Introductionmentioning

confidence: 99%

Reduced-Complexity Radio Architectures for Enhanced Receive Selection Combining in Multiuser Diversity Systems

Tsakalaki

Alrabadi

Papadias

et al. 2012

International Journal of Antennas and Propagation

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Although antenna selection is a simple and efficient technique for enhancing the downlink performance of multiuser diversity systems, the large antenna interelement spacing required for achieving spatial diversity is prohibitive for user terminals due to size restrictions. In order to allay this problem, we propose miniaturized switched beam receiver designs assisted by low-cost passive reflectors. Unlike conventional spatial receive diversity systems, the proposed angular diversity architectures occupy a small volume whereas the antenna system properties are optimized by controlling the strong reactive fields present at small dimensions. The systems are designed for maximum antenna efficiency and low interbeam correlation, thus yieldingNpractically uncorrelated receive diversity branches. The simulation results show that the proposed enhanced diversity combining systems improve the average throughput of a multiuser network outperforming classical antenna selection especially for small user populations and compact user terminal size.

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“…In this way, the two scanned beams which serve the cell-edge users of two neighbor cells are never overlapping which keep co-channel intercell interference I k at very low level. At the receiver side, it has been shown that optimum combiner (OC) and maximum ratio combiner (MRC) strategies outperform the antenna selection technique, when a limited number of users are served in opportunistic schemes with multiple beams [10]. According to the OC technique, the optimum value…”

Section: Beamforming Pattern and Combining Techniquementioning

confidence: 99%

On the applicability of steerable beams in LTE-Advanced networks with high user mobility

Papathanasiou

Dimitriou

2012

J Wireless Com Network

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This article deals with the problem of applying scanning narrow beams to long-term evolution (LTE)-advanced networks that include in their coverage areas fast moving mobiles. The system scenario is assumed to include eNodeBs that can form multiple beams which can steer (rotate) their respective coverage areas. Additionally, the user downlink transmissions are supposed to be dynamically scheduled based on signal-to-noise plus interference ratio reports for physical resource blocks. The mobile user equipments (UEs) have multiple antenna elements which allow maximal ratio combining of the received signals. By applying coordinated transmission of steerable beams at neighboring eNodeBs, we could mitigate inter-cell interference in a multi-cell interference deployment. The coverage area and total throughput may significantly be enhanced, compared to the current LTE standard where inter-cell interference coordination technique is adopted for low-speed UEs. Furthermore, the proposed schemes involve low-complexity hardware implementation and low power consumption.

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On the Sum-Rate of Opportunistic Beamforming Schemes with Multiple Antennas at the Receiver

Cited by 9 publications

References 9 publications

Enhanced selection combining for compact single RF user terminals in multiuser diversity systems

Enhanced selection combining for compact single RF user terminals in multiuser diversity systems

Reduced-Complexity Radio Architectures for Enhanced Receive Selection Combining in Multiuser Diversity Systems

On the applicability of steerable beams in LTE-Advanced networks with high user mobility

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