Analogue CMOS direct sequence spread spectrum transceiver with carrier recovery employing complex spreading sequences

DSSS (direct sequence spread spectrum) is a form of digital communication where each bit is represented by a unique spreading sequence. DSSS is a promising technique for implementing high speed wireless links. For any DSSS communication system to be successful, an effective, low cost transceiver is required. This paper presents transceiver systems which have the potential to fulfil this role. An analogue DSSS transceiver is presented to demonstrate an ideal receiver and a DDC-CRL (decision directed Costas carrier recovery loop) is presented which performs carrier and phase estimation in the receiver. These systems operate anywhere over a 20 MHz bandwidth within the 2.4 GHz to 2.4835 GHz ISM (industrial, scientific and medical) band and are implemented for the 0.35 mum CMOS process from Austria Microsystems (AMS)