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OPNET收发信机管道阶段及无线建模.ppt

发布时间：2022-06-15 发布人：admin 分类：说明书 资料大小：1.53M 资料格式：ppt 举报 版权申诉
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    OPNET UNIVERSITY 2000 Transceiver Pipeline and Radio Modeling Copyright © 2000 MIL 3, Inc. Modeling Custom Wireless Effects– 1
    OPNET UNIVERSITY 2000 Goals • Introduce the OPNET Transceiver Pipeline – Capabilities – Defaults • Modify pipeline – Show openness and extensibility – Model custom wireless effects Copyright © 2000 MIL 3, Inc. Modeling Custom Wireless Effects– 2
    OPNET UNIVERSITY 2000 Overview • Wireless modeling overview • Transceiver pipeline • Pipeline architecture and default stages – Lab: Closure - Custom Pipeline Statistic – Break – Lab: Channel Match - Doppler Shifts – Break – Lab: Power, Inoise, ECC - Signal Lock vs. Power Lock • Conclusion Copyright © 2000 MIL 3, Inc. Modeling Custom Wireless Effects– 3
    OPNET UNIVERSITY 2000 Wireless Modeling Overview • Wireless communications – Broadcast medium – Communication more likely to be problematic – Less of a controlled environment than wireline • Wireless channels need to be characterized appropriately – Model real-world channel behavior - Frequencies, power, line-of-sight, interference, etc. – Channel characteristics affect higher layer protocol behavior • Simulation tool must support wireless modeling – Node mobility - Car, ship, aircraft, satellite, etc. – Link-budget-analysis computation Copyright © 2000 MIL 3, Inc. Modeling Custom Wireless Effects– 4
    OPNET UNIVERSITY 2000 Transceiver Pipeline • Models packet transmission across communications channel • Implements physical layer characteristics • Divided into multiple stages • Determines if packet can be received Each stage models an aspect of the channel’s behavior . . . S13 S1 S2 S3 Packet Tx Rx Copyright © 2000 MIL 3, Inc. Modeling Custom Wireless Effects– 5
    OPNET UNIVERSITY 2000 Pipeline Stages • Sequence of ‘C’ or ‘C++’ procedures – Computes line-of-sight, signal strength, bit errors, etc. – Can indicate packet is not receivable • Each procedure has a defined interface (prototype) – Argument is typically a packet – Information typically obtained and stored as Transmission Data Attributes (TDA) Copyright © 2000 MIL 3, Inc. Modeling Custom Wireless Effects– 6
    OPNET UNIVERSITY 2000 Transmission Data Attributes (TDA) • Scope – Special packet storage areas - Part of every packet – Carry numerical values - Integer, Object ID, floating point, or pointer – Initialized by kernel at start of transmission – Readable during a packet’s life – Writable only in pipeline • Purpose – Carry pipeline information - Kernel to pipeline stage - Pipeline stage to kernel - Between pipeline stages Pre-Defined TDA User-Defined Tx Rx Copyright © 2000 MIL 3, Inc. Modeling Custom Wireless Effects– 7
    OPNET UNIVERSITY 2000 Pipeline Models • Scope – Each stage uses a pipeline model – Stages are referenced via a pipeline model object attributes - Point-to-Point - link attributes - Bus -Bus attributes - Radio - transceiver attributes – Stages must be compiled prior to reference • Modeling method – Create stage in context of the pipeline model – Compile stage into object form – Change pipeline model object attribute to reference stage • NOTE: Stage and procedure (pipeline model context) can be used interchangeably Copyright © 2000 MIL 3, Inc. Modeling Custom Wireless Effects– 8
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