Crosstalk in multiplex systems using Walsh functions

Crosstalk in multiplex systems using Walsh functions as carriers can be attributed to individual components in the multiplexers and demultiplexers and to the effects of the data highway on the multiplex waveform. Calculations and measurements on an experimental system show that the worst crosstalk performance is caused by the effects of the data highway, particularly time delays and slow edges. A modification to the experimental system, which excludes the effect of the data highway from the demultiplexing process, considerably improves the performance of the system. The worst level of crosstalk in the system was improved from ¿34 dB to ¿72 dB below peak signal level. This improvement renders these systems suitable for applications from which the high levels of crosstalk previously encountered excluded them.