The Design and Implementation of a Semi-Custom Transmitter for CDMA Direct Sequence

Dennis Gee-Wai Yee

M.S.1996  (advisor: Robert Brodersen).

High-performance wireless communications systems allow access to real-time data located on a high-speed network using portable, low-power terminals. For a pico-cellular network, a basestation within each cell serves as the interface between the backbone network and the various mobile units. A CDMA direct sequence spread-spectrum transmitter is presented which allows the basestation to provide a 1Mbps downlink to each of 15 portable multimedia terminals within the cell. The total transmit bandwidth is 41.6MHz centered at a carrier frequency of 1.056GHz. This design can be easily scaled to support up to 50 users within a single cell.