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    Agilent Technologies
    Wireless Test Solutions
    Application Note 1313




I


Q




    Testing and Troubleshooting
    Digital RF Communications
    Transmitter Designs
    Introduction   The demand for ubiquitous wireless communications is challenging the physical
                   constraints placed upon current wireless communications systems. In addition,
                   wireless customers expect wireline quality from their service providers. Service
                   providers have invested a lot in a very limited slice of the radio spectrum.
                   Consequently, network equipment manufacturers must produce wireless systems
                   that can be quickly deployed and provide bandwidth-efficient communications.

                   At early stages of equipment design, rigorous testing is performed to ensure
                   system interoperability. The increasingly complex nature of digital modulation is
                   placing additional pressure on design teams, already faced with tight project
                   deadlines. Not only must the designer test to conformance; he must also quickly
                   infer possible problem causes from measurement results.

                   The objective of this application note is to help you understand why the
                   different transmitter tests are important and how they identify the most common
                   impairments in transmitter designs.

                   The application note focuses on cellular communications transmitters, although
                   some of the measurements and problems described may also apply to other
                   digital communications systems.

                   This application note covers the following topics:
                       1. How digital communications transmitters work.
                       2. How to test transmitters and what test equipment characteristics
                          are important.
                       3. The common impairments of a transmitter and how to
                          troubleshoot them.

                   The following information is also included as reference material:
                       

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