Impact of RF front-end impairments and mobility on channel reciprocity for closed-loop multiple antenna techniques

Dias, Alexandre Ribeiro; Bateman, D.G.; Gosse, K.

doi:10.1109/pimrc.2004.1373935

Cited by 7 publications

(3 citation statements)

References 5 publications

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“…Unfortunately, the reciprocity is only valid for the "over the air" (i.e., from antenna to antenna) segment while channel estimation is usually performed at the baseband level after the radio-frequency chain. This calls for efficient calibration schemes not easy to be implemented [27]. An alternative approach consists in performing the estimation process at the receiver and feeding channel measurements back through a reliable reverse link.…”

Section: G Acquisition Of Channel State Information and Robust Optimmentioning

confidence: 99%

A Tutorial on the Optimization of Amplify-and-Forward MIMO Relay Systems

Sanguinetti

D’Amico

Rong

2012

IEEE J. Select. Areas Commun.

186

130

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Abstract-The remarkable promise of multiple-input multipleoutput (MIMO) wireless channels has motivated an intense research activity to characterize the theoretical and practical issues associated with the design of transmit (source) and receive (destination) processing matrices under different operating conditions. This activity was primarily focused on point-to-point (single-hop) communications but more recently there has been an extensive work on two-hop or multi-hop settings in which single or multiple relays are used to deliver the information from the source to the destination. The aim of this tutorial is to provide an up-to-date overview of the fundamental results and practical implementation issues of designing amplify-and-forward MIMO relay systems.

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Section: G Acquisition Of Channel State Information and Robust Optimmentioning

confidence: 99%

A Tutorial on the Optimization of Amplify-and-Forward MIMO Relay Systems

Sanguinetti

D’Amico

Rong

2012

IEEE J. Select. Areas Commun.

186

130

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“…This calls for efficient calibration schemes able to compensate for any possible amplitude and phase error between the transmit and receive RF chains. If not properly mitigated, these errors might result in severe degradation of the system performance [17]. From a practical point of view, however, this calibration is not easy to achieve and, thus, open-loop systems are nowadays considered unsuitable for commercial multi-user systems.…”

Section: Open-loop Systemsmentioning

confidence: 99%

Fundamentals of Multi-User MIMO Communications

Sanguinetti

Poor

2009

New Directions in Wireless Communications Research

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In recent years, the remarkable promise of multiple-antenna techniques has motivated an intense research activity devoted to characterizing the theoretical and practical issues associated with multiple-input multiple-output wireless channels. This activity was first focused primarily on single-user communications but more recently there has been extensive work on multi-user settings. The aim of this chapter is to provide an overview of the fundamental information-theoretic results and practical implementation issues of multi-user multiple-antenna networks operating under various conditions of channel state information.The contents of this chapter are as follows. In Section 1 we introduce basic notation and describe the system model of interest. The latter includes both uplink and downlink models for a general mobile communication system operating with multiple antennas at both the base station and mobile terminals. In Section 2 we concentrate on channel capacity as a means of characterizing such systems, and review basic results under various operating conditions, including patterns of knowledge of information about the state of the channel between transmitter(s) and receiver(s). In Section 3 we address the problem of acquisition of channel state information at the transmitter and receiver, and describe the distinctive features of open-loop and closed-loop systems. In Section 4 we provide an overview of system design issues and discuss techniques that require channel state information at the transmitter, while in Section 5 we briefly review some recent work on techniques that allow

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“…[12] çalışmasında da implante cihazlar için kullanılan elektrik veya manyetik alanların iletimi temelli veri iletişim sistemleri için başlıca problem olabilecek kanal simetrikligi incelenmiş ve sonuçlar göstermiştir ki, sinyal transfer karakteristikleri aynı oldugu ve böylece kanalın karşılıklı özelliginin geçerli oldugu görülmüştür. [13] çalışmasında bazı ideal olmayan durumlar ve RF önyüz eksikliklerinin etkisi olsa bile, kanalın karşılıklı olma durumu MIMO sisteme uygulanmış ve sonuçlar karşılıklı kanalın verimliligini ispat etmiş, [14], [15] çalışmalarında ise, MIMO tabanlı sistemde karşılıklı kanal varsayımı ve RF önyüz eksikligi etkisi aynışekilde incelenmiştir. Sonuç olarak, RF önyüz kusurları, karşılıklı kanal varsayımını olumsuz yönde etkileyebildigi gözlemlenmiştir.…”

Section: Introductionunclassified