Power control for WCDMA

This project tries to introduce itself in the physical implementations that make possible the denominated third generation mobile technology. As well as to know the technology kind that makes possible, for example, a video-call in real time. During this project, the different phases passed from the election of WCDMA like the access method for UMTS will appear. Its coexistence with previous network GSM will be analyzed, where the compatibility between systems has been one of the most important aspects in the development of WCDMA, the involved standardization organisms in the process, as well as the different protocols that make the mobile communications within a network UTRAN possible. Special emphasis during the study of the great contribution that has offered WCDMA with respect to the control of power of the existing signals will be made. The future lines that are considered in the present, and other comment that already are in their last phase of development in the field of the mobile technology. UMTS through WCDMA can be summarized like a revolution of the air interface accompanied by a revolution in the network of their architecture

Near far resistant detection for CDMA personal communication systems.

The growth of Personal Communications, the keyword of the 90s, has already the signs of a technological revolution. The foundations of this revolution are currently set through the standardization of the Universal Mobile Telecommunication System (UMTS), a communication system with synergistic terrestrial and satellite segments. The main characteristic of the UMTS radio interface, is the provision of ISDN services. Services with higher than voice data rates require more spectrum, thus techniques that utilize spectrum as efficiently as possible are currently at the forefront of the research community interests. Two of the most spectrally efficient multiple access technologies, namely. Code Division Multiple Access (CDMA) and Time Division Multiple Access (TDMA) concentrate the efforts of the European telecommunity.This thesis addresses problems and. proposes solutions for CDMA systems that must comply with the UMTS requirements. Prompted by Viterbi's call for further extending the potential of CDMA through signal processing at the receiving end, we propose new Minimum Mean Square Error receiver architectures. MMSE detection schemes offer significant advantages compared to the conventional correlation based receivers as they are NEar FAr Resistant (NEFAR) over a wide range of interfering power levels. The NEFAR characteristic of these detectors reduces considerably the requirements of the power control loops currently found in commercial CDMA systems. MMSE detectors are also found, to have significant performance gains over other well established interference cancellation techniques like the decorrelating detector, especially in heavily loaded system conditions. The implementation architecture of MMSE receivers can be either Multiple-Input Multiple Output (MIMO) or Single-Input Single-Output. The later offers not only complexity that is comparable to the conventional detector, but also has the inherent advantage of employing adaptive algorithms which can be used to provide both the dispreading and the interference cancellation function, without the knowledge of the codes of interfering users. Furthermore, in multipath fading channels, adaptive MMSE detectors can exploit the multipath diversity acting as RAKE combiners. The later ability is distinctive to MMSE based receivers, and it is achieved in an autonomous fashion, without the knowledge of the multipath intensity profile. The communicator achieves its performance objectives by the synergy of the signal processor and the channel decoder. According to the propositions of this thesis, the form of the signal processor needs to be changed, in order to exploit the horizons of spread spectrum signaling. However, maximum likelihood channel decoding algorithms need not change. It is the way that these algorithms are utilized that needs to be revis ed. In this respect, we identify three major utilization scenarios and an attempt is made to quantify which of the three best matches the requirements of a UMTS oriented CDMA radio interface. Based on our findings, channel coding can be used as a mapping technique from the information bit to a more ''intelligent" chip, matching the ''intelligence" of the signal processor

Who runs the radio commons? The role of strategic associations in governing transnational common pool resources

This thesis investigates how collective action is achieved in the governance of transnational common pool resources, taking the example of the electromagnetic radio spectrum as a global common. The thesis asks what determines variation in operational and collective choice property arrangements in common pool resources such as the radio spectrum. The radio spectrum represents the totality of radio frequencies used for wireless communications around the world. It is a transnational resource that exhibits properties of other common pool resources: a) high rivalry in consumption and b) difficulty in excluding non-contributing beneficiaries from its use. This study demonstrates that the presence of a public actor – even one with established authority at transnational level such as the Commission of the European Union – cannot fully explain variations in the configuration of property arrangements in the radio resource. Instead, this study finds that private actors in the electronic communications industry – i.e. service operators and system developers – define rules of access and rules of use in the transnational radio resource, by means of negotiating the configuration of technology systems used to extract value from the resource. In addition, this study finds that industry actors are able to define common operational rules to access and use a transnational frequency pool even in complex situations of heterogeneous economic interests and heterogeneous technology capabilities. They reduce uncertainty in these complex situations by increasing participation in decision-making and by developing mechanisms of information exchange and mutual monitoring in industry associations. When industry actors agree these common rules of management, and reinforce them with common rules of exclusion, they are more likely to negotiate operational arrangements based on principles of common exclusive property rather than individual exclusive property in the transnational radio resource. These findings are derived from the analysis of four case studies, which trace the development of operational rules in five radio frequency bands across time. By revealing the central role of industry associations in defining property arrangements in transnational commons such as the radio spectrum, this research seeks to contribute to the debate about the nature and scope of private transnational governance of common goods

Soft handover parameter optimisation for DS-CDMA downlink design.

DS-CDMA - Direct Sequence Code Division Multiple AccessAvailable from British Library Document Supply Centre-DSC:DX189702 / BLDSC - British Library Document Supply CentreSIGLEGBUnited Kingdo

European Spectrum Management Principles, 23 J. Marshall J. Computer & Info. L. 277 (2005)

Any discussion of European policies is a complicated one, in part because the word Europe means different things to different people. At the present time, the European Union has expanded to twenty-five countries and more countries may become provisional members within the next years. These countries represent a multitude of cultures, languages, and legal traditions so talking about a European approach to a given matter is to risk making inherently flawed generalizations about diverse peoples, cultures, and systems. However, one generalization is rather safe to assert: the traditional regulatory model in Europe has been based on a state-run monopoly structure that has concretely changed only within the past ten years while private ownership of telecommunications networks is a very new concept, as is the growth and consolidation of equipment providers. The article starts with covering aspects of developing laws within the European Union, as well as discusses member countries\u27 attempts to coordinate their regulatory efforts in a relentless move away from telecommunications monopolies and towards free markets. This concept of spectrum management at the European Union level has begun only recently because frequencies have traditionally been allocated, allotted, and assigned by the individual states. It then provides an overview of the important technology-related actions taken by the European Union in past years, including the implementation of technology promotion programs such as the RACE program and the passage of the new framework for telecommunications and its associated Radio Spectrum Decision. By analyzing past actions and based on the success of European lawmaking in spite of distance, language and cultural differences as well as the radical change of telecommunications management from a process of coordination among government telecommunication ministries to a more complicated consensus-building procedure among private industries the author predicts that the trends toward the continued privatization of telecommunications and the transfer of responsibility from the public to the private realm will become stronger in the future, especially since a strong communications framework is not only a matter of importance to the public, but it is also critical to the European Union\u27s ability to function smoothly as an economic community