Design and synthesis of reconfigurable non maximally decimated and maximally decimated polyphase filter bank based structures

Abstract

Smart green technology characterized by high throughput and low power consumption defines a new perspective in digital signal processing (DSP) systems. To accommodate the fast-growing data rate and bandwidth, the systems must have high operating speed and computing capability. The performance trade-offs and hardware design requirements of these high-end DSP systems are determined by a wide range of parameters, which makes the system design task more difficult. Multirate filter banks offer efficient spectral processing tools which are proved to have sufficient potential in handling the above challenging tasks, in the design of modern DSP systems. They find wide applications in speech coding, image processing, adaptive signal processing, audio processing, biomedical signal processing, statistical signal processing and wideband spectrum channelization. The polyphase decomposition, is proved to result in computationally efficient realization of filter banks. In this thesis, the usage of polyphase filter banks in wideband channelizers in wireless communication systems and hearing aids is considered. The most computationally intensive part of a wideband receiver in a wireless communication system, is the channelizer, which demands reconfigurability, low power consumption, high precision and low hardware complexity. The design complexity and the adjacent channel aliasing of maximally decimated polyphase filter banks, make them unsuitable for high resolution channelizing applications. However, non-maximally decimated filter bank (NMDFB) overcomes the adjacent channel aliasing problem by increasing the sample rate. Also, the simple design of analysis and synthesis prototype filters to meet the perfect reconstruction conditions and good reconfigurability, make NMDFB a popular choice to realize hardware and power efficient high resolution wideband channelizers. Nowadays, the radio spectrum is becoming very scarce and the spectral efficiency is given top priority inwideband transceiver designs.