Abstract: A central system is presented for managing operation of a plurality of electromagnetic transceiver stations, forming a wireless electromagnetic closed loop communication network, to enable single-channel communication between the transceiver stations in the closed loop topology network. The central system comprises a data processor utility which is adapted to receive and process data indicative of an arrangement map of the plurality of the electromagnetic transceiver stations and generate data indicative of a polarization map for the communication network for communication between the transceiver stations using a single frequency channel. The said data indicative of the arrangement map comprises at least location data comprising locations of the stations defining at least one closed loop topology. The polarization map comprises data indicative of assigned polarization states for transmission between each two neighboring stations along the closed loop network.

Abstract: For digitally demodulating a PSK analog signal transmitted as a linearly modulated carrier and representing successive symbols at a rate 1/T, the signal is sampled at a rate 1/.tau. at least twice the symbol rate 1/T, successive samples sampled with different filters selected from a plurality of filters corresponding to instants of no IES that are mutually offset by a fraction of the sampling .tau. that is optimum as regards coincidence between the respective sampling instant and an instant at which there is no ISI. A mean symbol demodulation rate equal to the symbol transmission rate is however retained. The signal as delivered by the selected filters in succession is decoded.

Abstract: A modular traffic analyzer for one or more digital signal multipath transmission channels for the management of digital or analog telephone installations including a module for acquiring and storing samples and a module for processing the latter. A module including at least one dedicated discrimination circuit per signal type travelling over the channel is provided so as to perform, from spectral and power values of the digital signal, a compression of discriminated parameter signal and a distribution according to the signal type or in a temporal mode with respect to one or more channels.