Split spread-spectrum technique for flexible use of frequency bands

The paper investigates methods to minimise interference between spread-spectrum (SS) radio-location systems and other radio services. Methods to control the power spectral density (PSD) of SS signals are reviewed. A novel technique, called `split-signal´, is described which minimises mutual interference. The technique exploits the noncontinuous use of the radio spectrum by splitting the SS signals into several lower-rate, narrower-bandwidth components. These are transmitted independently in gaps in the radio spectrum and recombined at the receiver. It is shown, by analysis and simulation, that the performance of split-signal SS radio-location systems in comparable to that of conventional wideband SS systems