On the Design of a Configurable UMTS/NAVSAT Transceiver

This paper introduces a combined UMTS/NAVSAT receiver architecture. After a review of the state-of-the-art, a configurable UMTS/NAVSAT architecture is proposed. The investigated concept is based on a reconfigurable receive chain to prevent duplication of hardware, which will result in considerably lower costs. The biggest challenge in the design of NAVSAT receivers are the extremely tight noise figure (NF) requirements. Another key issue of integrated UMTS/NAVSAT receivers is the maximum tolerable UMTS transmit leakage injected into the NAVSAT receiver. An analytical derivation of the acceptable UMTS transmitter leakage for a certain ranging degradation is given. These values are compared with measured leakage values based on power amplifiers (PA) and surface acoustic wave (SAW) filters for UMTS.