OPTIMAL TRAINING PARAMETERS FOR CONTINUOUSLY VARYING MIMO CHANNELS
AffiliationUniversity of Missouri – Rolla
MetadataShow full item record
RightsCopyright © International Foundation for Telemetering
Collection InformationProceedings from the International Telemetering Conference are made available by the International Foundation for Telemetering and the University of Arizona Libraries. Visit http://www.telemetry.org/index.php/contact-us if you have questions about items in this collection.
AbstractTo correctly demodulate a signal sent through a multiple-input multiple-output (MIMO) channel, a receiver may use training to learn the channel parameters. The choice of training parameters can significantly impact system performance. Training too often yields low throughput while training infrequently produces poor channel estimates and increased transmission errors. Previous work on optimal training parameters has focused on the block fading Rayleigh model. This work examines a more general case; finding the training parameters that maximize throughput for a continuously varying channel. Training parameters that maximize a lower bound on channel capacity are determined via simulation, and general guidelines are presented for selecting optimal training parameters.
SponsorsInternational Foundation for Telemetering
Showing items related by title, author, creator and subject.
I. Development of Rapid Conductance-Based Protocols for Measuring Ion Channel Activity; II. Expression, Characterization, and Purification of the ATP-Sensitive, Inwardly-Rectifying K+ Channel, Kir6.2, and Ion Channel-Coupled ReceptorsAgasid, Mark Tadashi (The University of Arizona., 2017)Ligand-gated and ligand-modulated ion channel (IC) sensors have received increased attention for their ability to transduce ligand-binding events into a readily measurable electrical signal. Ligand-binding to an IC modulates the ion flux properties of the channel in label-free manner, often with single-molecule sensitivity and selectivity. As a result, ICs are attractive sensing elements in biosensoring platforms, especially for ligands lacking optical (e.g. fluorescent) or electrochemical properties. Despite the growing number of available ligand-gated and ligand-modulated ICs and artificial lipid bilayer platforms for IC reconstitution, significant work remains in defining the analytical performance capabilities of IC sensors. Particularly, few studies have described platforms for making measurements with rapid temporal resolution and high sensitivity. In this work, we describe an artificial lipid bilayer platform which enables rapid measurement of ion channel activity, a key parameter for developing IC sensors suitable for studying biological events, e.g. single cell exocytosis (Chapter 2 and 3). Additionally, we developed expression, purification, and reconstitution protocols for Kir6.2, a model ligand-gated ion channel, for use in sensor development (Chapter 4). The final goal is to reconstitute ion channel-coupled receptors (ICCRs), G protein-coupled receptor-Kir6.2 fusion proteins, into artificial lipid bilayers to detect small molecules and hormones targeting GPCRs. Towards this goal, we characterized the expression and function of two ICCRs, M2-Kir and D2-Kir, in HEK293 cells (Chapter 5).
Errors Resulting from Channel Filters and Adjacent Channel Crosstalk in DSB/SC Telemetry SystemsSalter, W. E.; Frost, W. O.; Sperry-Rand Corporation; Marshall Space Flight Center (International Foundation for Telemetering, 1968-10)The waveform distortion resulting from adjacent channel crosstalk and from amplitude and phase nonlinearity in channel filters limits the minimum channel spacing, and hence the bandwidth utilization efficiency of a double sideband/suppressed carrier (DSB/SC) telemetry link. The paper presents results of an analysis defining the minimum achievable mean-square error when Butterworth filters are used in the DSB demodulator/demultiplexer. With data inputs consisting of band-limited random signals, solutions are given for various combinations of data order, filter order, channel spacing, and filter cut-off. The trade-off between waveform distortion and channel spacing is illustrated, and optimum locations for the filter cut-off are defined. The irremovable error based on Weiner optimum filter theory is presented as an interesting basis for comparison.
CHANNELIZATION AND CHANNEL MONITORING IN FDMA COMMUNICATIONSGagliardi, R. M.; University of Southern California (International Foundation for Telemetering, 1972-10)In this paper the concept of spacecraft self-regulation of downlink power output is investigated for a hypothetical frequency division multiple access (FDMA) communication net. In this operation channels are filtered off (channelization) and monitored to determine those channels that are inactive; i.e., not transmitting. The results of the activity survey are then used to control channel gain in the spacecraft and regulate the drive power into the output amplifier. In this way, available repeater power normally not used during periods of low activity can be redistributed over the active channels to improve their performance. For maximum improvement, this requires not only adjustment of the individual channel gains, but removal of the inactive channels from the limiter. Equations are developed which are useful for system design and aid in the evaluation of resulting system performance and assessment of feasibility of implementation.