Jointly opportunistic beamforming and scheduling (JOBS) for downlink packet access

Avidor, D.; Papadias, Constantinos B.

doi:10.1109/icc.2004.1313072

Cited by 20 publications

(16 citation statements)

References 8 publications

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“…This approach achieves the asymptotic average throughput of coherent beamforming with modest signal-to-noise ratio (SNR) feedback. Several [4] proposes an opportunistic beamforming and scheduling algorithm that enhances the throughput and de lay characteristics of the system whereas, in [5], multiple orthonormal random beams at the BS serve multiple MTs simultaneously in each time slot. Opportunistic beamforming techniques rely on the assump tion that, with a large number of MTs, there is a high probability that an arbitrary choice of a BS beamforming vector will be aligned to a user's channel vector [6].…”

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: Introductionmentioning

confidence: 99%

“…The SPA is also shown in 3 dimensions in the right-up corner.N B = 4 angular positions (based on the image theory). Then, the matrix Xi E C5 x 5 can be defined as(4) …”

mentioning

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

“…Therefore, a tradeoff between the system throughput performance and user delays exists in the scheduler designs. Instead of the average delay, similar as in [10] we use the delay outage probability, which defines the probability that the per-user inter packet delay exceeds a certain threshold:…”

Section: Packet Throughput Based Scheduling With Delay Constraintsmentioning

confidence: 99%

Delay constrained multiuser scheduling schemes based on upper-layer performance

Zhang¹,

Dai²

2006

IEEE Wireless Communications and Networking Conference, 2006. WCNC 2006.

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Abstract-Different from conventional multiuser scheduling schemes targeting on optimizing the physical layer performance criteria such as Shannon capacity and error probability, in this paper we propose a family of new scheduling methods that take the packet throughput in upper-layer protocols into considerations. This new performance metric appears to be an elegant combination of spectral efficiency and channel reliability, which are two usually competitive performance indicators for practical transmitters and receivers. Our results show that regarding the packet throughput, the proposed schedulers may result in great performance advantage over conventional schemes, especially at low to intermediate SNR. Furthermore, the amount of system delay for each user is investigated together with packet throughput for scheduling algorithm designs. A novel scheduler, considering both system performance and user delays, is then proposed, and the corresponding delaythroughput tradeoff curve is drawn, which actually provides a useful and flexible platform to evaluate any scheduling schemes, if both factors are under concern.

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“…It exploits the inherent multi-user diversity of cellular systems to schedule the mobile user with the most favorable instantaneous channel quality. This technique was later tied up with the waiting times of the active mobile users to reduce the probability of excessive packet delay and improve cell throughput [7].…”

Section: Introductionmentioning

confidence: 99%

Opportunistic beamforming for secondary users in licensed shared access networks

Taramas

Alexandropoulos

Papadias

2014

2014 6th International Symposium on Communications, Control and Signal Processing (ISCCSP)

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Licensed shared access (LSA) is a recently proposed concept for spectrum sharing which is based on authorized schemes of rights for secondary networks ensuring predictable performance to the incumbent network. In this paper, a secondary system (SS) employing an opportunistic beamforming technique with user scheduling is assumed to coexist with a primary system (PS). The proposed technique exploits the availability of PS information to SS offered by LSA, to serve the preferred SS user subject to the quality of service of the preferred PS user. In particular, for each generated beam per time slot, the multi-antenna SS base station decides whether to send data to the SS user with the maximum time-averaged rate request, depending on the quality of service requirement of the preferred PS user available in the LSA repository. Simulation performance results for a cellular channel model have shown that the proposed technique is capable of boosting the performance of the overall network.

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Jointly opportunistic beamforming and scheduling (JOBS) for downlink packet access

Cited by 20 publications

References 8 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

Delay constrained multiuser scheduling schemes based on upper-layer performance

Opportunistic beamforming for secondary users in licensed shared access networks

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