Matched filter for DS-CDMA of up to 50 MChip/s based on sampled analog signal processing

The matched filter (MF) is known as the fastest method for acquisition of DS-CDMA signals. The MF calculates a cross-correlation between an input signal and a filtering coefficient employed for modulation. Power consumption of the MF is a key issue for realizing multimedia hand-held terminals. Recently, a MF that uses analog signal processing has achieved a maximum processing rate of 25 MHz with 110 mW power consumption. Although this is a significant step toward the realization of a wideband CDMA, a considerable amount of improvement in processing rate is still required. Improvement is made in the processing rate without resorting to a scaled process. Process fluctuations are compensated to maintain high-precision analog signal processing.