19 Hexagonal Cells 3 cell-edge users per cell 4-by-4 antenna configuration Proposed IA 28% gain
Sum Rate (bits/s/Hz)
4
Baseline: Matched Filtering
3
2
Non-negligible residual interference
1
0 -20
-10
0
10 20 SNR (dB)
30
40
Performance Gain Residual interference
negligible
non-negligible
Significant gain Gain reduced; but still respectable
Performance Gain Residual interference
negligible
non-negligible
Significant gain Gain reduced; but still respectable
Great potential to heterogeneous networks
Performance Gain Residual interference
negligible
non-negligible
Significant gain Gain reduced; but still respectable
Great potential to heterogeneous networks E.g., macro-pico cellular networks
Pico-BS
Performance Gain Residual interference
Significant gain
negligible
non-negligible
Gain reduced; but still respectable
Great potential to heterogeneous networks E.g., macro-pico cellular networks
Pico-user significantly interfered with by the nearby macro-BS
Pico-BS
Conclusion • Developed a new downlink IA technique
Conclusion • Developed a new downlink IA technique • Requires only localized within-the-cell feedback mechanism
Conclusion • Developed a new downlink IA technique • Requires only localized within-the-cell feedback mechanism • Can be implemented with small changes to multiuser MIMO systems
Conclusion • Developed a new downlink IA technique • Requires only localized within-the-cell feedback mechanism • Can be implemented with small changes to multiuser MIMO systems
• Shows ~30% cell-edge throughput gain in 19 hexagonal cellular layout
Conclusion • Developed a new downlink IA technique • Requires only localized within-the-cell feedback mechanism • Can be implemented with small changes to multiuser MIMO systems
• Shows ~30% cell-edge throughput gain in 19 hexagonal cellular layout • Has great potential to heterogeneous networks
cellular networks, multi-user MIMO. I. INTRODUCTION. ONE of the key performance metrics in the design of cellular systems is that of cell-edge spectral ...
Paper approved by N. Jindal, the Editor for MIMO Techniques of the. IEEE Communications ... Interference-free degrees-of-freedom ...... a distance . Based on ...
May 5, 2015 - can achieve the optimal degrees-of-freedom, equal to K/2, in the K-user ... â The author is with the Department of Computer Science and.
Simulation results show that the proposed scheme provides significant improvement in ... Section IV shows simulation results under the OIA scheme. Finally, we summarize the paper with some ..... [1] V. R. Cadambe and S. A. Jafar, âInterference alig
Feb 15, 2013 - Index TermsâDegrees-of-freedom (DoF), opportunistic inter- ... Education, Science and Technology (2010-0011140, 2012R1A1A1044151). A part of .... information of the channels from the transmitter to all receivers, i.e., its own ......
Feb 15, 2013 - Interference management is a crucial problem in wireless ... of International Studies, Dankook University, Yongin 448-701, Republic of ... Education, Science and Technology (2010-0011140, 2012R1A1A1044151). A part of this .... informat
May 9, 2014 - based on the exiting zero-forcing receiver. We first propose a codebook-based OIA, in which the weight vectors are chosen from a predefined ...
Dec 14, 2015 - the new standardization called IEEE 802.11 high-efficiency wireless ... Short Range Wireless Transmission Technology with Robustness to ...
usage is required for the decoding of one signal block [6]. In addition, global channel state .... K-cell MIMO Interfering MAC. We show that for the antenna ...
scheme that approaches to interference-free degree-of-freedom. (dof) as the number K of ... space (instead of one dimension) for simultaneous alignments at multiple non-intended ..... of frequency-domain channels. So the matrix Ha can be.
AbstractâWe introduce an energy-efficient distributed op- portunistic interference alignment (OIA) scheme that greatly improves the sum-rates in multiple-cell ...
1School of ECE, UNIST, Ulsan, Korea, E-mail: [email protected]. 2Dept. of CSE .... user feeds back the effective channel vector and quantity of inter-cell.
determine a subset of interfering streams for IA. Based on this. IA model ... the performance of a network throughput optimization problem under our proposed IA ...
Sep 28, 2011 - where Ïâ is the solution between 0 and 1 such that .... pared to the aggregated remaining BSs. ... backhaul between BSs of different cells.
Dec 12, 2011 - Introduction. To suppress interference between users is an important prob- lem in communication systems where multiple users share the same resources. Recently, interference alignment (IA) was introduced for fundamentally solving the i
scaling law required to achieve KS degrees-of-freedom (DoF), where S(⤠M) ..... SNR and the BS selects best S MSs that have higher effective. SNRs than the ...
Nov 14, 2014 - Architecture and DesignâWireless communication. Keywords ... adversary, we exploit propagation delays as an advantage for throughput ...
degrees of freedom (DoF) for an arbitrary MIMO network with- out symbol ... achieves a total degrees of freedom (DoF) that grows linearly ..... The MIT Press, 2007.
