Abstract: In this study, an adaptable Turbo codec has been designed to meet the specifications of different
Quality of service (QOS) of 3G applications. In the third generation networks, a wide variety of services are
offered and the different services require reconfiguration of the existing Turbo codec. There are different stages
involved in the design of turbo codes. The design varies according to the requirements of quality of service.
Certain applications may require less delay, whereas some other application may need less loss in data. Turbo
codes can be made to satisfy the different QOS requirements by proper analysis and design. In this study, a
complete analysis has been made on certain QOS requirements and the impact of various components of turbo
codes on the QOS. Based on the analysis alongwith the simulation, the design of turbo code is implemented
to achieve the desired Quality of service for various transmission.