Spatial Multiplexing with a Single Radio: Proof-of-Concept Experiments in an Indoor Environment with a 2.6-GHz Prototype

Alrabadi, Osama N.; Divarathne, Chamath; Tragas, Philippos; Kalis, Antonis; Marchetti, Nicola; Papadias, Constantinos B.; Prasad, Ramjee

doi:10.1109/lcomm.2011.121310.102119

Cited by 62 publications

(23 citation statements)

References 5 publications

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“…Following [12] [16] where it is shown and verified that conventional channel model can be applied to ESPAR-based arrays, in this paper we employ a geometric semi-correlated Rayleigh channel H = h …”

Section: B Channel Modelmentioning

confidence: 99%

Tunable load MIMO with quantized loads

Masouros

Sellathurai

et al. 2017

2017 25th European Signal Processing Conference (EUSIPCO)

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Abstract-In this paper, we study the application of precoding schemes on practical electronically steerable parasitic array radiators (ESPARs), where quantized load impedances are considered for each antenna element. The presence of quantization in the loads results in a performance loss for practical ESPARs. To alleviate the performance loss, we propose to approximate the ideal current vector with convex optimization, where it is further shown that the optimality is achieved by optimizing the feeding voltages only. Specifically, we obtain the closed-form expression when single-fed ESPARs are assumed. Numerical results show that the proposed quantization-robust scheme can achieve a significant performance gain over ESPARs with quantized loads.

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Section: B Channel Modelmentioning

confidence: 99%

Tunable load MIMO with quantized loads

Masouros

Sellathurai

et al. 2017

2017 25th European Signal Processing Conference (EUSIPCO)

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“…Its main drawback is that it is not fully compatible with standard receivers for classical voltage-based modulation techniques. A proof-of-concept implementation can be found in [12]. A prototype that evolved from that concept is reported in [13].…”

Section: Related Workmentioning

confidence: 99%

Load modulated massive MIMO

Müller

Sedaghat

Fischer

2014

2014 IEEE Global Conference on Signal and Information Processing (GlobalSIP)

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We propose a new hardware architecture for costand size-effective implementation of massive MIMO transmitters based on load modulation that is fully compatible with standard receiver architectures. With load modulation, a massive MIMO transmitter can be driven by a single power amplifier operating at constant envelope. The various data streams are modulated onto the antennas elements by varying the complex impedances of the various antenna circuits at symbol rate. The law of large numbers ensures that the common power source is matched to the parallel concatenation of the various antenna circuits, if the number of antenna elements is very large.For 100 antenna elements that are supposed to transmit Gaussian-like signals, e.g. due to OFDM modulation and/or precoding, the crest factor is only 1.2 dB at a clipping probability of 0.1%. In that case, load modulation reduces the average consumed power and the amplifier peak power by 49% and 79%, respectively, as compared to classical distributed amplifiers with voltage modulation. Furthermore, one class F amplifier can be used to replace 100 class A/B amplifiers.Mutual antenna coupling need not be addressed by a physical matching network, but can be mitigated dynamically by digital signal processing in baseband without additional hardware. This allows for closer antenna spacing as in architectures with distributed amplifiers.

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“…Observing (1) and (2) [21]. It is worth mentioning that throughout the paper transmission and reception will be considered at the azimuth plane, i.e.…”

Section: Brief Description Of Espar Antennasmentioning

confidence: 99%

A parasitic antenna array for directive multi-hop sensor communication

Barousis

Roumpakias

Papadias

2013

2013 IEEE 14th Workshop on Signal Processing Advances in Wireless Communications (SPAWC)

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Due to the strict size and power constraints of wireless sensor nodes, the design of a compact and energy efficient antenna module with adaptive directive gains is an extremely crucial problem. Conventional solutions are often prohibitive for such applications, as they require multiple radiofrequency (RF) chains that increase dramatically the hardware complexity and the power consumption. Motivated however by the benefits of adaptive antennas, which reflect to significant performance gains in a sensor network, this paper proposes an alternative design with pattern-switching ability, built on parasitic antenna elements that overcomes the aforementioned drawbacks. Indeed, it will be shown that the proposed compact antenna design might be a strong candidate for small-sized sensor nodes with low power constraints, since it requires a single RF chain and provides high directive gain. This implies remarkable hardware and energy savings, but without compromising the performance gains of the sensor network.

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Spatial Multiplexing with a Single Radio: Proof-of-Concept Experiments in an Indoor Environment with a 2.6-GHz Prototype

Cited by 62 publications

References 5 publications

Tunable load MIMO with quantized loads

Tunable load MIMO with quantized loads

Load modulated massive MIMO

A parasitic antenna array for directive multi-hop sensor communication

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