Low-power structures of Digital Matched Filter for direct sequence spread spectrum systems

Direct sequence spread spectrum (DSSS) is a transmission technology used in wireless local area network (WLAN) transmissions. In this technology, a data signal at the transmitting station is combined with a high data rate bit sequence, known as pseudo noise (PN) code results in spreaded signal. To recover the spreaded signal at the receiver, Digital Matched Filter (DMF) is required. DMF is core element of all digital spread spectrum receiver, and mainly used in PN rapid capture and de-spreading. In this paper we have designed the two different low-power structure of DMF and basic building blocks of DMF that is known as correlation calculation (CCU) unit. We have been designed DMF by using 180 nm Complementary metal-oxide-semiconductor (CMOS) process at 27°C with 5V supply voltage in SPECTRE simulator.