Power Rotational Interleaver for an IDMA system is the brief description of multiple access schemes used in telecommunication systems such as FDMA, TDMA, CDMA, IDMA system and short description of different kind of interleavers used in IDMA system. In this book I am presenting an detailed algorithm, analysis and comparative study of Power Rotational Interleaver which is designed to ensure the randomness of scrambled data which is essential requirement of IDMA system and to reduce the memory required which is a essential requirement of communication system.