Analysis and design of a frequency-hopped spread-spectrum transceiver for wireless personal communications

Personal Communications Services (PCS) require low-power radio technologies . One such transceiver architecture employing frequency-hopped spread-spect rum techniques is presented. System features such as antenna diversity with equal-gain combining and sequential hop combining are incorporated into th e transceiver design to achieve robust wireless digital data transmission o ver fading channels. A direct-conversion architecture from radio frequency (RF) to baseband reduces the overall power consumption by eliminating inter mediate frequency (IF) components. High-rate frequency hopping with frequen cy-shift keying (FSK) modulation is Implemented using a direct digital freq uency synthesis technique, il,multiplierless correlation FSK detector, suit able for direct-conversion receivers, has been designed for quadrature nonc oherent detection. Robust acquisition algorithms based on energy detection and pattern matching and tracking architectures using digital phase-locked loops are also described for system synchronization. The proposed transceiv er is well-suited for Low-power PCS applications and other portable wireles s communications.