The Veterans Emergency Housing Program

Dynamic spectrum access (DSA) schemes allow the users to share spectrum resources by taking advantage of the variations in spectrum demand over time and space. Carrying out dynamic spectrum allocation centrally, however, can be a complex task. For this reason, distributed schemes in which users can access the available channels independently may be preferable to centralized DSA schemes. Cognitive radio systems, which enable user terminals to sense their environment and form their action accordingly, are particularly well-suited for distributed systems. On the other hand, the freedom in distributed schemes gives the users the option to act selfishly, which has decisive effects on system performance. In this paper we consider a distributed multichannel wireless random access system where users selfishly access the channels in the system. We analyze the behavior of the selfish users by modeling the system as a non-cooperative game and we identify all stable operating points (Nash equilibria) of this game. We then compare the performance of this system with a number of cooperative distributed DSA schemes in terms of user utilities. Our results show that the performance of the selfish multichannel random access system can be comparable to cooperative schemes.QC 20111208. © 2010 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works. QC 20111207</p

Simple HF antenna efficiency comparisons using the WSPR system

Determining the efficiency of an HF-antenna by measurements requires is a complex procedure involving expensive equipment, calibrated instruments for field strengths. In this paper we evaluate a simple, inexpensive method to determine the relative efficiency of an antenna relative a reference antenna. The method uses the Weak Signal Propagation Reporter(WSPR) network of receivers that are located all over the world. These receivers report the estimated signal-to-noise ratio of received beacon signals to the WSPR.net database where the data can be retrieved (almost) in real time. In the paper we analyze the method, estimate its accuracy and discuss advantages and limitations. Some preliminary measurement results are presented

Alvarado Revisited: A Missing Element in Alaska’s Quest to Provide Impartial Juries for Rural Alaskans

In Alvarado v. State, the Alaska Supreme Court declared that an impartial jury is a cross section of the community and that the community where the events at issue transpired must be represented in the jury. This decision spurred changes to jury selection procedures and the creation of Criminal Rule 18, an effort to ensure defendants from remote villages are judged by a jury representative of these rural areas. The Alaska Court of Appeals recently addressed an issue of first impression regarding the application of Criminal Rule 18. In Joseph v. State, the defendant was convicted of murdering his girlfriend in the tiny Native village of Rampart. His trial was conducted in Fairbanks by a jury selected from an area that does not include Rampart or any other similar Native village. Criminal Rule 18 allowed the defendant a limited time to transfer his trial to Nenana, which more closely resembles the characteristics of Rampart. However, the defendant was never informed of this right. His trial counsel believed trial location was a decision for the attorney and did not see a need to request the change. In a memorandum opinion that creates no binding precedent, the Court of Appeals agreed with this view and held it did not violate the defendant’s due process rights not to be informed of the opportunity to have his case heard at an alternative trial site. This Article challenges that view, arguing it fails to safeguard the spirit and purpose of the constitutional right to an impartial jury. To remote villagers in Bush Alaska whose customs, culture, and ways of life are vastly different than in larger cities within the state, the opportunity to be judged by those sharing similarities is of upmost importance. Consequently, decisions of trial venue, for purposes of Criminal Rule 18, should be knowingly made or waived by the defendant

Tractable Resource Management with Uplink Decoupled Millimeter-Wave Overlay in Ultra-Dense Cellular Networks

The forthcoming 5G cellular network is expected to overlay millimeter-wave (mmW) transmissions with the incumbent micro-wave ({\mu}W) architecture. The overall mm-{\mu}W resource management should therefore harmonize with each other. This paper aims at maximizing the overall downlink (DL) rate with a minimum uplink (UL) rate constraint, and concludes: mmW tends to focus more on DL transmissions while {\mu}W has high priority for complementing UL, under time-division duplex (TDD) mmW operations. Such UL dedication of {\mu}W results from the limited use of mmW UL bandwidth due to excessive power consumption and/or high peak-to-average power ratio (PAPR) at mobile users. To further relieve this UL bottleneck, we propose mmW UL decoupling that allows each legacy {\mu}W base station (BS) to receive mmW signals. Its impact on mm-{\mu}W resource management is provided in a tractable way by virtue of a novel closed-form mm-{\mu}W spectral efficiency (SE) derivation. In an ultra-dense cellular network (UDN), our derivation verifies mmW (or {\mu}W) SE is a logarithmic function of BS-to-user density ratio. This strikingly simple yet practically valid analysis is enabled by exploiting stochastic geometry in conjunction with real three dimensional (3D) building blockage statistics in Seoul, Korea.Comment: to appear in IEEE Transactions on Wireless Communications (17 pages, 11 figures, 1 table

Asymptotic Behavior of Ultra-Dense Cellular Networks and Its Economic Impact

This paper investigates the relationship between base station (BS) density and average spectral efficiency (SE) in the downlink of a cellular network. This relationship has been well known for sparse deployment, i.e. when the number of BSs is small compared to the number of users. In this case the SE is independent of BS density. As BS density grows, on the other hand, it has previously been shown that increasing the BS density increases the SE, but no tractable form for the SE-BS density relationship has yet been derived. In this paper we derive such a closed-form result that reveals the SE is asymptotically a logarithmic function of BS density as the density grows. Further, we study the impact of this result on the network operator's profit when user demand varies, and derive the profit maximizing BS density and the optimal amount of spectrum to be utilized in closed forms. In addition, we provide deployment planning guidelines that will aid the operator in his decision if he should invest in densifying his network or in acquiring more spectrum.Comment: This paper will appear in Proc. IEEE Global Commun. Conf. (GLOBECOM) 201

Siting Foreign Law: How Derrida Can Help

Secondary spectrum access to TV white spaces is considered as a promising solution to relieve the spectrum shortage. In Europe, SE43 working group in CEPT is leading the discussion on the technical requirements for exploiting TV white spaces through the recent ECC report 159. Its analytical approach for determining the maximum permissible power for the secondary user, however, overestimates the power level, and leads to significant violation of the interference limit for TV reception. In this letter, we address the problem by proposing a new approach for determining the secondary user transmit power based on the framework established in ECC report 159. Monte Carlo simulation shows that our method keeps the interference lose to the target.QC 20121113QUASA

Assessment of the economic development of Latvia and Ukraine

The global financial crisis and the ensuing global recession not only adversely affected global growth and poverty, but also presented constraints and challenges to public policy. Even though the world economy is slowly returning to growth, the recovery was difficult and lasted for almost 10 years. Preparing for the future requires an assessment of the consequences of the crisis and future challenges. Since 2010 economic growth in Latvia has been one of the fastest in the EU (from 2011-2018, GDP, on average, increased by 3.5% annually), however in 2019 economic growth has moderated. Growth opportunities are limited both by the uncertainty in the external environment (“trade wars” on the global economy, the outcome of Brexit, slower growth in EU countries, etc.), and the existing economic structure, which also negatively affects the competitiveness of Latvian producers. In the competitiveness rankings regularly published by the World Economic Forum (WEF), Latvia lags far behind other new EU member states, incl. other Baltic States. The economy of Ukraine currently is in very difficult environment: carrying out the Anti-terrorism activity in the eastern part, occupation of Crimea, the uncertainty in the system of political processes, the economic instability and other factors slow down its development. The deepening of the political and economic crisis in Ukraine, on the one hand, and transformational processes towards expanding European integration, on the other hand, daily create new challenges that domestic economic entities have not encountered before, and which are difficult to predict. The aim of the research is to carry out a comprehensive assessment of the dynamics of macroeconomic indicators of the social and economic development of the national economies of Latvia and Ukraine over the past 10 years (from 2010 to 2019) and identify the factors influencing it, to improve the forecasting of further trends and the planning of anti-crisis measures. As a result of the study, possible directions of economic policy were identified to improve the economic structure of Latvia and Ukraine in order to promote their sustainable development and competitiveness in the world market