Filter Stages for a High-Performanace Reconfigurable Radio Receiver with Minimum System Delay

In order to cope with the requirements of future mobile systems, there is a growing interest in the use of flexible but also highly optimized digital signal processing in mobile systems. In this contribution a novel solution for the realization of the digital signal processing for multimode-, multi-band-, and multifunctional wireless systems are presented. It is shown that a superior performance compared to state-of-the-art software defined radios can be obtained by using the proposed architecture. Main functional blocks are a special class of wave digital filters for sample rate conversion with integer values and an adjustable fractional delay filter. Thus also fractional decimation ratios can be realized enabling full flexibility. The design and optimization of these filters will be described in detail. Due to the proposed concept a number of advantages are obtained and a very efficient realization in VLSI-technology becomes feasible. The concept has been confirmed by an implementation on an FPGA.