The 18th Tyrrhenian Workshop on digital communications is devoted to wi- less communications. In the last decade, wireless communications research boosted launching new standards and proposing new techniques for the - cess technology. We moved from the UTRA standard capable to transmit 0. 5bit/s/Hz to WLAN which is promising 2. 7bit/s/Hz. Now wireless c- munication systems are facing a ?ourishing of new proposal moving from multiple antennas at transmitter and receiver side (MIMO systems), to new powerfulForwardErrorCorrectionCodes,toadaptiveradioresourcemana- mentalgorithms. Thenewchallenge,however,isthemovetowardsmultimedia communications and IP technology. This move implies e?orts in several new aspects. First of all an open network, as IP is, imposes the necessity of a - cure network, to guarantee the privacy of the ongoing communications, avoid the use of the networks by unauthorized customers, avoid the misuses and the charge to third parties of the cost of the connection. Also, quality of service (QoS) of the communications is becoming a must in IP networks which are carrying services which need a guaranteed QoS as telephony, real time s- vices, etc. To get this new target some form of access control to the network must be setup. Recently, new form of communication networks has appeared to collect data for several applications (sensor networks, ad hoc networks, etc. ) and they need a connection with a backbone network which could be a wireless one with a larger range than the sensor or ad hoc networks.

4G Wireless Systems.- Spatial Detection and Multistage Decoding for LST-MLC MIMO Systems.- Iterative (Turbo) Joint Rate and Data Detection in Coded CDMA Networks.- Hybrid ARQ Based on Rateless Coding for UTRAN LTE Wireless Systems.- On the Performance of Transmit Antenna Selection with OSTBC in Ricean MIMO Channels.- A Packet Detection Algorithm for the UWB Standard ECMA 368.- Low-Rate Predictive Feedback for the OFDM MIMO Broadcast Channel.- Ad-Hoc and Cellular Networks.- Interferer Nulling Based on Neighborhood Communication Patterns.- On the Beneficial Effects of Cooperative Wireless Peer-to-Peer Networking.- Relay Quality Awareness in Mesh Networks Routing.- Fundamental Bound on the Capacity of Ad Hoc Networks with Conventional Hop-by-Hop Routing.- A Stochastic Non-Cooperative Game for Energy Efficiency in Wireless Data Networks.- Security and Applications in Wireless Networks.- Security Overheads for Signaling in Beyond-3G Networks.- Mobility and Key Management in SAE/LTE.- Enhanced Operation Modes in IEEE 802.16 and Integration with Optical MANs.- WPAN Applications and System Performance.- Improving User Relocatability, Practicality, and Deployment in the Web Stream Customizer System.- Cross-Layer Error Recovery Optimization in WiFi Networks.- Qos and Efficiency in Multimedia Heterogeneous Wireless Networks.- Technology-Independent Service Access Point for QoS Interworking.- A Rate-Controlled VoIP System Based on Wireless Mesh Network Infrastructure: Design Issues and Performance Analaysis.- Toward the QoS Support in 4G Wireless Systems.- A Scheduling Algorithm for Providing QoS Guarantees in 802.11e WLANs.- Mobility Management QoS Measures Evaluation for Next Generation Mobile Data Networks.- Wireless Resource Allocation Considering Value of Frequency for Multi-Band Mobile Communication Systems.- Wireless Sensor Networks.- Wireless Sensor Networks and SNMP: Data Publication Over and IP Network.- Self-Localization of Wireless Sensor Nodes By Means of Autonomous Mobile Robots.- An Experimental Study of Aggregator Nodes Positioning in Wireless Sensor Networks.- SignetLab2: A Modular Management Architecture for Wireless Sensor Networks.