Sidestepping the Rayleigh limit for LoS spatial multiplexing: A distributed architecture for long-range wireless fiber

Irish, Andrew T.; Quitin, François; Madhow, Upamanyu; Rodwell, M.J.W.

doi:10.1109/ita.2013.6502954

Cited by 9 publications

(18 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The architecture investigated here for long-range LoS spatial multiplexing was introduced in our earlier conference paper [21], where a distant (airborne) transmitter communicates with widely separated ground-based receivers. These ground-based receivers act as relays and forward their received messages towards a central receiver, as shown in Figure 1.…”

Section: Distributed Mm-wave Architecturementioning

confidence: 99%

See 1 more Smart Citation

Achieving multiple degrees of freedom in long-range mm-wave MIMO channels using randomly distributed relays

Irish

Quitin

Madhow

et al. 2013

2013 Asilomar Conference on Signals, Systems and Computers

Self Cite

View full text Add to dashboard Cite

Multi-Gbps, long-range wireless communication at millimeter wave frequencies is characterized by channels with strong line-of-sight signal components, with link budgets relying on highly directional and dense transmit and receive antenna arrays with sub-wavelength inter-element spacing. A natural method to further increase data rates over such channels is to spatially multiplex several data streams by providing additional antenna arrays at both ends of the communication system. However, at the link ranges of interest, the resulting MIMO channel rank, largely governed by the Rayleigh criterion, is deficient for inter-array spacings that can be realized with reasonable node size. As exact relay placement is out of the question, one scalable approach to obtaining the maximum available degrees of freedom is to introduce relay nodes randomly distributed over a sufficiently large region that the effective inter-relay spacing satisfies a probabilistic version of the Rayleigh criterion. In this paper, we present analysis and simulation results which provide design guidelines regarding the required size of the relay region, and quantify the dependence of performance on the number of relays.

show abstract

Section: Distributed Mm-wave Architecturementioning

confidence: 99%

“…While the distributed MIMO architecture investigated here was first proposed in our earlier conference paper [21], the present paper provides a more detailed and rigorous analysis leading to design prescriptions for the number and placement of relays required for robust spatial multiplexing.…”

Section: Introductionmentioning

confidence: 99%

Achieving multiple degrees of freedom in long-range mm-wave MIMO channels using randomly distributed relays

Irish

Quitin

Madhow

et al. 2013

2013 Asilomar Conference on Signals, Systems and Computers

Self Cite

View full text Add to dashboard Cite

show abstract

“…We deduce the minimal separation required between HAPs, when they are located at 18 km above earth, operating at 48 GHz [1]. From the concept of LoS MIMO [5], we have:…”

Section: A Feasibility Of Df In Tethered Balloon Relaymentioning

confidence: 99%

“…In a single HAP system with multiple antennas at the transmitter, a spatial multiplexing gain cannot be typically achieved due to a high correlation between parallel paths [5]. However, the deployment of multiple spatially separated HAPs can be a promising solution to exploit spatial multiplexing and boost spectral efficiency.…”

Section: Introductionmentioning

confidence: 99%

“…In particular, by using a large number of antennas at the HAPs, one can provide a precise beamforming which is a key requirement for spatial multiplexing. To this end, channel state information (CSI) at the transmitter (CSIT) is required [5] [6]. However, in HAP drone systems, acquiring precise CSIT is challenging due to the high altitudes and the movement of the drones.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Sum-Rate Analysis for High Altitude Platform (HAP) Drones With Tethered Balloon Relay

et al. 2018

View full text Add to dashboard Cite

Abstract-High altitude platform (HAP) drones can provide broadband wireless connectivity to ground users in rural areas by establishing line-of-sight (LoS) links and exploiting effective beamforming techniques. However, at high altitudes, acquiring the channel state information (CSI) for HAPs, which is a key component to perform beamforming, is challenging. In this paper, by exploiting an interference alignment (IA) technique, a novel method for achieving the maximum sum-rate in HAPbased communications without CSI is proposed. In particular, to realize IA, a multiple-antenna tethered balloon is used as a relay between multiple HAP drones and ground stations (GSs). Here, a multiple-input multiple-output X network system is considered. The capacity of the considered M ×N X network with a tethered balloon relay is derived in closed-form. Simulation results corroborate the theoretical findings and show that the proposed approach yields the maximum sum-rate in multiple HAPs-GSs communications in absence of CSI. The results also show the existence of an optimal balloon's altitude for which the sum-rate is maximized.

show abstract

Multiple-high altitude platforms aided system architecture for achieving maximum last mile capacity in satellite communication

Sudheesh

Magarini

Muthuchidambaranathan

2018

Telecommun Syst

View full text Add to dashboard Cite

Sidestepping the Rayleigh limit for LoS spatial multiplexing: A distributed architecture for long-range wireless fiber

Cited by 9 publications

References 11 publications

Achieving multiple degrees of freedom in long-range mm-wave MIMO channels using randomly distributed relays

Achieving multiple degrees of freedom in long-range mm-wave MIMO channels using randomly distributed relays

Sum-Rate Analysis for High Altitude Platform (HAP) Drones With Tethered Balloon Relay

Multiple-high altitude platforms aided system architecture for achieving maximum last mile capacity in satellite communication

Contact Info

Product

Resources

About