Enabling real-time interference alignment

Miller, Kyle M.; Sanne, Atresh; Srinivasan, Kannan; Vishwanath, Sriram

doi:10.1145/2248371.2248382

Cited by 15 publications

(12 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Finally, the experimental results are shown and analyzed in detail. It is worth mentioning that, despite real-time blind IA (BIA) experiments which can be found in [14,15], this work is the first implementation of IA with both global channel state information (CSI) and real-time precoding and decoding at all nodes in the network.…”

Section: Contributionsmentioning

confidence: 99%

Experimental evaluation of flexible duplexing in multi-tier MIMO networks

Fanjul

Fernández

Ibáñez

et al. 2020

J Wireless Com Network

View full text Add to dashboard Cite

In this paper, we present an experimental evaluation of the performance benefits provided by flexible duplexing, an access technique that allows uplink and downlink cells to coexist within the same time-frequency resource blocks. In order to replicate a wireless multi-tier network composed of 1 macro-cell and 2 small cells, a measurement campaign has been conducted using an indoor wireless testbed comprised of a total of 6 multiple-input multiple-output (MIMO) software-defined radio (SDR) devices. Since each cell has a single active user, each uplink/downlink configuration can be identified with a different interference channel, over which interference alignment (IA) is used as an inter-cell interference management technique and compared to other existing methods. The obtained results show that flexible duplexing clearly outperforms the conventional time-division duplex (TDD) access approach, where all cells operate synchronized either in uplink or dowlink mode. Additionally, interference alignment consistently provides better results in most of the interference regimes when compared to minimum mean square error (MMSE)-based schemes. The impact of channel estimate quality on the different communication strategies is also studied. It is worth highlighting that the presented over-the-air (OTA) experiments represent the first implementation of IA with real-time precoding and decoding.

show abstract

Section: Contributionsmentioning

confidence: 99%

Experimental evaluation of flexible duplexing in multi-tier MIMO networks

Fanjul

Fernández

Ibáñez

et al. 2020

J Wireless Com Network

View full text Add to dashboard Cite

show abstract

“…BIA over relays require global CSI at the relays. Moreover BIA with reconfigurable antennas can also be used in HetNets [33,34] Clearly BIA can be realized by antenna switching technology instead of reconfigurable antennas [14]. To create short-term channel patterns, different antenna technologies are proposed in the literature, electronically steerable parasitic array radiator (ESPAR) [35], circular patch and printed dipole array structures [12].…”

Section: Ofdm Systemsmentioning

confidence: 99%

Implementation aspects for interference alignment

Yetis

Anand

Kayran

et al. 2015

2015 IEEE International Conference on Digital Signal Processing (DSP)

View full text Add to dashboard Cite

Several interference alignment (IA) testbeds have been reported by research groups that validate the theoretical findings thus demonstrating the feasibility of IA. The design complexity of the IA testbed is significant since many simultaneous wireless links have to be established to observe the benefits of IA. Therefore, the already enormous efforts needed for the development of multiple-input multiple-output (MIMO) testbeds are folded multiple times in IA testbeds. In general, testbeds can be categorized into three groups depending on the hardware platform, generic, specific and the hybrid of two. Clearly, developing on generic, hybrid and application specific platforms in turn are the safe steps towards real life prototyping. There are many research groups that have been developing IA on generic platforms [1]- [17]. To the best of our knowledge, there is only one research group that has developed on a hybrid platform [18], and none on the application specific platform. In this paper, we review the experimental IA evaluations in the literature, include important aspects from well-known prototyping principles in the picture, and give comparative discussion with the state-of-art wireless communications testbeds.

show abstract

“…Past systems implementing interference alignment [15,7,13] typically require multi-antenna senders that are aware of channel state information. Blind interference alignment [18], does not require channel state information at the transmitter, but needs symbol-level time synchronization between transmitters and receivers. Some theoretical work proposes interference alignment for single-antenna nodes either in frequency [25], or in time [19].…”

Section: Related Workmentioning

confidence: 99%

Interference alignment by motion

Adib

Kumar

Aryan

et al. 2013

Proceedings of the 19th Annual International Conference on Mobile Computing &Amp; Networking - MobiCom '13

View full text Add to dashboard Cite

Recent years have witnessed increasing interest in interference alignment which has been demonstrated to deliver gains for wireless networks both analytically and empirically. Typically, interference alignment is achieved by having a MIMO sender precode its transmission to align it at the receiver. In this paper, we show, for the first time, that interference alignment can be achieved via motion, and works even for single-antenna transmitters. Specifically, this alignment can be achieved purely by sliding the receiver's antenna. Interestingly, the amount of antenna displacement is of the order of one inch which makes it practical to incorporate into recent sliding antennas available on the market. We implemented our design on USRPs and demonstrated that it can deliver 1.98× throughput gains over 802.11n in networks with both single-antenna and multiantenna nodes.

show abstract

Enabling real-time interference alignment

Cited by 15 publications

References 6 publications

Experimental evaluation of flexible duplexing in multi-tier MIMO networks

Experimental evaluation of flexible duplexing in multi-tier MIMO networks

Implementation aspects for interference alignment

Interference alignment by motion

Contact Info

Product

Resources

About