Feedback reduction scheme for downlink multiuser diversity

So, Jaewoo; Cioffi, J.M.

doi:10.1109/twc.2009.080282

Cited by 24 publications

(12 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the simulations, we employ N = 128, B = 1.25 MHz and J = 11 modulation and coding schemes (MCSs) levels based on the IEEE 802.16e [17], and use the corresponding thresholds {x j } J j=1 in [18] with the target packet error rate of ε = 1% through the link level simulation, as shown in Table I. Also, Table I gives the average data rate g j with the modulation and coding rate.…”

Section: Numerical and Simulation Resultsmentioning

confidence: 99%

Multiuser Diversity with Capture in OFDMA systems with clustered feedback

Guo

Fang

et al. 2012

2012 International Conference on Wireless Communications and Signal Processing (WCSP)

View full text Add to dashboard Cite

In this paper, we propose a cluster-based feedback protocol for multiuser orthogonal frequency-division multipleaccess (OFDMA) systems, where the capture effect is employed in each cluster to reduce the enormous system overhead induced by polling channel-state information. Then, we analyze the system throughput performance of the proposed feedback protocol. Compared with the full feedback scheme in the literature, numerical simulations show that the proposed protocol with clustered feedback in OFDMA systems achieves higher system throughput by employing the capture effect with limited feedback overhead, when the number of users is reasonably large. Moreover, compared with our previous protocol of Multiuser Diversity with Capture, the proposed one additionally exploits multiuser diversity in the frequency domain, thereby achieving better throughput performance as shown by the simulation results. Abstract-In this paper, we propose a cluster-based feedback protocol for multiuser orthogonal frequency-division multipleaccess (OFDMA) systems, where the capture effect is employed in each cluster to reduce the enormous system overhead induced by polling channel-state information. Then, we analyze the system throughput performance of the proposed feedback protocol. Compared with the full feedback scheme in the literature, numerical simulations show that the proposed protocol with clustered feedback in OFDMA systems achieves higher system throughput by employing the capture effect with limited feedback overhead, when the number of users is reasonably large. Moreover, compared with our previous protocol of Multiuser Diversity with Capture, the proposed one additionally exploits multiuser diversity in the frequency domain, thereby achieving better throughput performance as shown by the simulation results.Index Terms-Capture effect, clustered feedback, multiuser diversity, orthogonal frequency-division multiple-access (OFDMA).

show abstract

Section: Numerical and Simulation Resultsmentioning

confidence: 99%

Multiuser Diversity with Capture in OFDMA systems with clustered feedback

Guo

Fang

et al. 2012

2012 International Conference on Wireless Communications and Signal Processing (WCSP)

View full text Add to dashboard Cite

show abstract

“…This type of CSI feedback is referred to as the prior CSI feedback in order to differentiate the CSI feedback after transmissions (or posterior CSI feedback) for HARQ-IR. Although the BS needs to know the full CSI, {α m,k }, to choose the best user, there are efficient schemes that can reduce the amount of feedback to send CSI to the BS for MD [27]. For example, for a given scheduling metric, we can consider the ordered feedback scheduling that the higher metric the user has, the earlier the user sends the feedback message to the BS.…”

Section: B Multiuser Diversity -Limited Prior Csi Feedbackmentioning

confidence: 99%

On the Energy Delay Tradeoff of HARQ-IR in Wireless Multiuser Systems

Choi

Jeon

2013

IEEE Trans. Commun.

View full text Add to dashboard Cite

Abstract-Energy delay tradeoff (EDT) is a fundamentaltradeoff that plays a crucial role in understanding the energy efficiency of various transmission schemes. In particular, for hybrid automatic repeat request (HARQ) protocols, the EDT can be well defined. In this paper, in order to understand the EDT for a wireless multiuser system, we consider various downlink transmission schemes where the HARQ with incremental redundancy (HARQ-IR) protocol is employed for reliable transmissions to users. For a given total power, the impact of different transmission schemes in conjunction with power allocation on EDT is extensively studied. Among the transmission schemes, it is shown that the threshold-based transmission (TBT) scheme efficiently lowers the minimum energy per bit (EB) in spite of limited prior channel state information (CSI) feedback. The study is further extended to a more plausible scenario where users have different channel statistics. In doing so, we consider a proportional fairness scheduling based on relative channel gain that can be easily accommodated in the proposed TBT scheme, and study its EDT behaviors. Performance evaluations show that the schemes incorporating proportional fairness achieve good EDT performances while guaranteeing the fairness among users.Index Terms-Energy efficiency, hybrid automatic repeat request (HARQ), power allocation.

show abstract

“…Optimal quantization strategy for OBF systems with more than one bit feedback is proposed in [36]. It is also worth noting the group random access-based feedback scheme in [39] and the multi-user diversity/throughput tradeoff analysis in [40]. The main tool to study the performance of OBF/RBF under reduced feedback schemes is the large-number-of-users analysis.…”

Section: Reduced and Quantized Feedback In Obf/rbfmentioning

confidence: 99%