ISSN:0737-2884    

DOI:10.1002/sat.4600050402

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1987

数据来源: WILEY

摘要:

AbstractIn this part of the paper on Ku‐band VSAT networks, the issue of overall system design is considered. After discussing possible system architectures, primary attention is given to the star network configuration in which customer‐premise VSATs communicate with a central hub station, co‐located with, or terrestrially connected to a host computer. The component elements of a Ku‐band star network for interactive data applications are discussed and the critical items from the point‐of‐view of performance, capacity and cost are identified. An analytical model for the network, which combines delay‐throughput characterization of the multi‐access inbound and TDM outbound channels with satellite link analysis is described. The analytical model is exercised over a range of typical system component, traffic model and performance objective scenarios to provide a set of general design guidelines. These guidelines are useful for evaluating the trade‐offs between key system elements (channel access unit, modem, VSAT antenna and satellite), VSAT traffic message length parameters and the performance objectives (average and peak network response time and availability). The results are used to address the issue of multi‐access protocol selection over a range of scenarios typical of 1.2 or 1.8m VSAT‐based interactive networks using current commercial Ku‐band satellites. The results show that interactive star networks are often limited by satellite power rather than bandwidth, so that the use of simple contention access for VSATs may not imply a significant

ISSN:0737-2884    

DOI:10.1002/sat.4600050403

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1987

数据来源: WILEY

摘要:

AbstractFully variable demand assignment in a SS/TDMA satellite system requires frequent burst time plan changes with reconfiguration of the on‐board switch matrix state sequence. The burst managment presented in this paper assumes that bursts are not reconfigurated into new bursts during such burst time plan changes but merely shifted in time. The performance of this burst management procedure as obtained from simulations over three different networks is reported in terms of throughput gains, required signalling capacity and time required to change burst time pla

ISSN:0737-2884    

DOI:10.1002/sat.4600050404

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1987

数据来源: WILEY

摘要:

AbstractThe intermodulation properties of a memoryless non‐linear amplifier with two carriers having large level difference are in the limit determined by the properties of the amplitude characteristic of the amplifier at a single point, i.e. at the operating point determined by the stronger carrier. The paper derives the mathematical expression for the level of the dominating third‐order intermodulation product, and also shows how this level can be determined graphically from a given amplitude characteris

ISSN:0737-2884    

DOI:10.1002/sat.4600050405

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1987

数据来源: WILEY

摘要:

AbstractIn this paper, a minimum mean square error equalizer (MMSE) for receiving quadrature phase shift keyed (QPSK) signals over band‐limited non‐linear satellite channels is designed. The effect of intersymbol interference due to non‐symmetrical frequency response followed by AM/AM and AM/PM conversions are taken into account while optimizing the performance in the presence of down‐link additive white Gaussian noise.The taps gain coefficients of the equalizer are obtained using numerical methods. The average probability of error is computed for two systems: the one sample detector and the (MMSE) equalizer. It is shown that significant improvement in performance is possible by replacing the one sample detector by an MMSE eq

ISSN:0737-2884    

DOI:10.1002/sat.4600050406

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1987

数据来源: WILEY

ISSN:0737-2884    

DOI:10.1002/sat.4600050407

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1987

数据来源: WILEY

ISSN:0737-2884    

DOI:10.1002/sat.4600050401

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1987

数据来源: WILEY