Use of the amps (Advanced Mobile Phone Service) microwave channel, operating in the 800‐ to 900‐MHz band, creates unique problems in addition to those connected with conventional land communications. Because the channel characteristics are not fixed, they present design challenges and impairments that must be dealt with to protect mobile telephone users from experiencing excessive variabilities in voice transmission quality and in control and signaling reliability. This paper describes the radio transmission features of the amps system, emphasizing the processing and control techniques designed to deal with the dynamic nature of the mobile radio channel.
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