Dynamic multi-link indoor MIMO measurements at 5.3 GHZ

Koivunen, Jukka; Almers, Peter; Kolmonen, Veli-Matti; Salmi, Jussi; Richter, Andreas; Tufvesson, Fredrik; Suvikunnas, P.; Molisch, Andreas F.; Vainikainen, P.

doi:10.1049/ic.2007.1321

Cited by 20 publications

(12 citation statements)

References 11 publications

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“…To acquire suitable channel measurements, we implemented a MIMO-OFDM measurement testbed for the 3-user 2 × 2 MIMO interference channel, using a software defined radio platform [18]. We gave special attention to the proper implementation of a synchronized MIMO-OFDM physical layer, a consideration that was not emphasized in [14], [16], [17], to guarantee the validity of our measurements. We augment the system we implemented in [18] to accommodate measurement setups over large outdoor areas.…”

Section: Arxiv:09111849v3 [Csit] 13 Oct 2010mentioning

confidence: 99%

“…Moreover, there are no comprehensive interference channel measurements suitable for studying IA in practice. The only comparable results on multiuser MIMO channel measurements, not directly related to IA, target broadcast channels consisting of a single base station and several receivers, and thus do not provide the required data on measured interference channels [14], [15]. Work done in [16], for example, presents multiuser measurements formed by concatenating separate single user measurements, claiming that the static measurement environment ensures the validity of the results.…”

Section: Introduction Imentioning

confidence: 99%

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The Feasibility of Interference Alignment Over Measured MIMO-OFDM Channels

Ayach

Peters

Heath

2010

IEEE Trans. Veh. Technol.

110

101

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Abstract-Interference alignment (IA) has been shown to achieve the maximum achievable degrees of freedom in the interference channel. This results in sum rate scaling linearly with the number of users in the high signal-to-noise-ratio (SNR) regime. Linear scaling is achieved by precoding transmitted signals to align interference subspaces at the receivers, given channel knowledge of all transmit-receive pairs, effectively reducing the number of discernible interferers. The theory of IA was derived under assumptions about the richness of scattering in the propagation channel; practical channels do not guarantee such ideal characteristics. This paper presents the first experimental study of IA in measured multiple-input multiple-output orthogonal frequency-division multiplexing (MIMO-OFDM) interference channels. Our measurement campaign includes a variety of indoor and outdoor measurement scenarios at The University of Texas at Austin. We show that IA achieves the claimed scaling factors, or degrees of freedom, in several measured channel settings for a 3 user, 2 antennas per node setup. In addition to verifying the claimed performance, we characterize the effect of Kronecker spatial correlation on sum rate and present two other correlation measures, which we show are more tightly related to the achieved sum rate.Index Terms-Channel measurements, interference alignment, multiple-inputmultiple-output (MIMO),software defined radio.

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Section: Arxiv:09111849v3 [Csit] 13 Oct 2010mentioning

confidence: 99%

Section: Introduction Imentioning

confidence: 99%

The Feasibility of Interference Alignment Over Measured MIMO-OFDM Channels

Ayach

Peters

Heath

2010

IEEE Trans. Veh. Technol.

110

101

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“…However, this is definitely not the case for rapidly changing environments and the high-mobility measurements as considered in this paper. To the best of the authors knowledge, real synchronized MU-MIMO channel measurements have only been described in [24]. The measurements were conducted using a MEDAV-LUND channel sounder with its corresponding receiver as well as the receiver of an Elektrobit channel sounder.…”

Section: Introductionmentioning

confidence: 99%

“…The authors present capacity results for the uplink channel, as well as path-loss and delay spreads for the measured scenarios. However, the measurements in [24] are limited to a two-user case while also being very costly and time-consuming.…”

Section: Introductionmentioning

confidence: 99%

On the trade-off between feedback and capacity in measured MU-MIMO channels

Kaltenberger

Kountouris

Gesbert

et al. 2009

IEEE Trans. Wireless Commun.

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Abstract-In this work we study the capacity of multi-user multiple-input multiple-output (MU-MIMO) downlink channels with codebook-based limited feedback using real measurement data. Several aspects of MU-MIMO channels are evaluated. Firstly, we compare the sum rate of different MU-MIMO precoding schemes in various channel conditions. Secondly, we study the effect of different codebooks on the performance of limited feedback MU-MIMO. Thirdly, we relate the required feedback rate with the achievable rate on the downlink channel. Real multi-user channel measurement data acquired with the Eurecom MIMO OpenAir Sounder (EMOS) is used.To the best of our knowledge, these are the first measurement results giving evidence of how MU-MIMO precoding schemes depend on the precoding scheme, channel characteristics, user separation, and codebook. For example, we show that having a large user separation as well as codebooks adapted to the second order statistics of the channel gives a sum rate close to the theoretical limit. A small user separation due to bad scheduling or a poorly adapted codebook on the other hand can impair the gain brought by MU-MIMO. The tools and the analysis presented in this paper allow the system designer to trade-off downlink rate with feedback rate by carefully choosing the codebook.

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“…With the possibility of resolving the parameters of the multipath components in the channel, the double-directional behavior of the channel and the interference can be analyzed, and the parameters can be used in the development of multilink channel models. In addition to the work in [21]- [23], we present here a detailed system performance analysis with example results.…”

mentioning

confidence: 99%

A Dynamic Dual-Link Wideband MIMO Channel Sounder for 5.3 GHz

Kolmonen¹,

Almers

Salmi

et al. 2010

IEEE Trans. Instrum. Meas.

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Abstract-In this paper, we present and evaluate the performance of a dynamic dual-link wideband multiple-input-multipleoutput (MIMO) channel sounder. The channel sounder can simultaneously measure two wideband dual-polarized links, each with a MIMO matrix size of 30 × 30 and 30 × 32. Multilink MIMO systems, including multiuser and cooperative MIMO, are essential parts of future high-throughput wireless local area networks and fourth-generation cellular systems. To fully understand such systems, the dynamic characteristics of multilink MIMO channels have to be measured. In this paper, we present a channel sounder that enables such measurements, including double-directional parameter estimation possibility for both links. The presented dual-link MIMO channel sounder does not suffer from the deficiencies of previous "virtual multiuser"measurement systems. Furthermore, system analysis and sample results from a measurement campaign with this channel sounder at 5.3 GHz in an indoor office environment are presented.Index Terms-Channel measurements, dual link, multiple-input multiple-output (MIMO), multiuser, radio channel.

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Dynamic multi-link indoor MIMO measurements at 5.3 GHZ

Abstract: Dynamic multi-link indoor MIMO measurements at 5.3 GHz.

Cited by 20 publications

References 11 publications

The Feasibility of Interference Alignment Over Measured MIMO-OFDM Channels

The Feasibility of Interference Alignment Over Measured MIMO-OFDM Channels

On the trade-off between feedback and capacity in measured MU-MIMO channels

A Dynamic Dual-Link Wideband MIMO Channel Sounder for 5.3 GHz

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