[show abstract][hide abstract] ABSTRACT: In this paper, cochannel interference in a TDMA-system at 60 GHz is investigated. Based on a static coverage prediction for the base stations we investigate the cochannel interference in the system caused by randomly placed mobile stations, thus modeling the dynamic behavior of a cellular network. We will show that frequency division duplex is not necessary due to cochannel interference and the frequency reuse factor can be very small. Simulations on outage probabilities con#rm a very reliable system behavior even in those cases.
[show abstract][hide abstract] ABSTRACT: The paper presents a wireless integrated services communications system for indoor and campus use. Whereas most current indoor wireless systems are distinct solutions for different services, our network, WISCS, covers the entire range from low-rate mobiles to high-speed portables. The system employs a picocellular structure in the 60 GHz band to provide capacity demanded by broadband services. The system concept and the employment of simple transponders connected via an optical fibre to a central base station allow a cost effective implementation. Virtual clustering of different number of cells is applied to allow coexistance of low rate mobile users and high rate portable users in one common system. WISCS uses adaptive modulation to yield an optimised performance in both the mobile and portable environment. The project is carried out at Communications Laboratory at Dresden University of Technology. Research includes new optical devices, flexible, efficient and error protected transmitting schemes, mm-wave circuits, antennas, and protocols. A demonstrator is currently under development.
[show abstract][hide abstract] ABSTRACT: In this paper the air interface for an integrated broadband wireless system at 60 GHz is introduced. The system is targeted for accommodating di#erent multimedia services such as voice, video, and high data rates up to 155 Mbit#s ATM at low cost and to allow for some mobility. The paper discusses the di#culties of designing a multiple access scheme and choosing the right modulation techniques for such an integrated system. It is shown that due to the heterogeneity of the di#erent demands regarding bit rate, bit error rate, burstiness, cost, and mobility, amodular system structureisneeded. After the general problem statement of the basic properties and demands, a solution for the air-interface at 60 GHz is derived.
[show abstract][hide abstract] ABSTRACT: For a regular array of hexagonal cells in a suburban outdoor
environment, we examined resource allocation schemes in the radio
network controller (RNC) for the uplink and downlink in a UMTS network.
In the uplink, the noise rise is the parameter of choice. In the
downlink, the power for different data rates and the connection as a
whole serves as the means to control the network. Allocating this
resource in admission and congestion control, the throughput of a packet
service with variable data rate was optimised