Linear adaptive fractionally spaced equalisation of CDMA multiple-access interference

A method for adaptively cancelling the multiple-access interference in CDMA systems is addressed. The technique is based on adaptive linear fractional spaced equalisation (LFSE). The simulation results indicate that the LFSE offers significant gains over the conventional detector eliminating the near-far problem without the explicit knowledge of the interfering spreading sequences. Furthermore, LFSE performs despreading and multipath (RAKE) combining with no extra complexity.<>     

Evolutionary mobility and service support in DECT access networks

This paper presents an access-independent network architecture for supporting UMTS service capabilities. The approach is based on an enhanced B-ISDN core network with personal and terminal mobility provided by intelligent network techniques. A physical realization is presented, and the protocols corresponding to the physical interfaces are identified. Protocols are proposed for UMTS mobility and service support, and the impact on the B-UNI and IN interfaces is considered. Reflecting the vision of the ETSI global multimedia mobility (GMM) standardization framework, UMTS service support through non-UMTS access is considered. Consideration of DECT as a UMTS access technology leads to an interworking proposal that presents each DECT terminal to the core network in terms of UMTS functional entities. Access-independent usage of UMTS terminal applications motivates additional interworking in the terminal to encapsulate the access network. The desirability of an access-independent UMTS application programming interface in the terminal is indicated     

Intelligent antenna solutions for UMTS: algorithms and simulation results

This article outlines the development of intelligent antenna (IA) solutions for UMTS, a third-generation W-CDMA system. Since the selection of an antenna configuration paired with realizable uplink/downlink algorithms that can satisfy all operating environments is a broad task, this article focus is on cost-effective antenna arrays for macrocells. Algorithms that exploit the antenna configurations and act at both the physical and MAC layers are highlighted and supported by simulation results. Two solutions stand out for UMTS: a universal beamforming algorithm that unifies user-specific and fixed beamforming under one framework, and multibeam scheduling (MBS) that significantly increases downlink packet data throughput using the concept of code reuse in conjunction with beamforming. The article summarizes the critical issues that were faced in the development of an IA solution capable of delivering the theoretically promised benefits to end users.     

Architectural aspects for the evolution of mobile communicationstoward UMTS

The transition from second- to third-generation mobile systems and the evolution paths of the relevant radio/network configurations are driven by technical and market considerations. In fact, these are affecting the standardization and research process ongoing at the regional level (ETSI, ACTS Program, US Joint Technical Committee, Japanese ARIB) as well as the global level (ITU). The related discussion is becoming more and more meaningful for operators and manufacturers who are perceiving, on the one hand, the new perspectives associated with service, features, and bandwidth management evolution, and on the other hand, the great impact that such an evolution could have on the existing market scenario and system development plans. In addition, due to the widespread usage of GSM worldwide, this system should also be considered within the evolution scenarios toward third generation. This paper analyzes the situation emerging from the standards context, identifies some key characteristics associated with current proposals, and tries to define a possible third-generation systems architecture based on the most encouraging propositions, e.g., the separation of radio-dependent and independent functions and the integration with B-ISDN. The paper rationale and the identified solutions reflect the research activities within the ACTS project RAINBOW (radio access independent broad band on wireless), addressing architectural solutions for UMTS (universal mobile telecommunications system), the European developing standard for third-generation systems