Design and Realization of Baseband Signal Downsampling in LTE System
During the random access process of LTE (Long Term Evolution) system, PRACH needs to perform significant amount of computations (e.g. IFFT, FFT) on received signals. Therefore conducting downsampling on received signals is necessary to decrease the complexity of the subsequent signal processing work. Downsampling usually employs a multi-stage filter which consists of a CIC filter, a compensation filter and a half-band filter. This paper introduced a new downsampling method using a multi-stage half-band filter with three half-band decimation filters.