Multirate technique is necessary for systems with different input and output sampling rates. Recent advances in mobile computing and communication applications demand low power and high speed VLSI DSP systems. This paper presents multirate modules used for filtering to provide signal processing in wireless communication system. Much architecture developed for the design of low complexity, bit parallel multiple constant multiplications operation which dominates the complexity of DSP systems. However, major drawbacks of present approaches are either too costly or not efficient enough.