Abstract
The need for robots to communicate in hostile environments (such as nuclear power plants) led the cea-letl to appoly its knowledge in the field of spread spectrum. By using an innovative reception structure and a diversity system the Direct Sequence Spread Spectrum ( dsss) technique is able to take advantage of the multipath phenomena where conventional radio using narrow band modulations fail. The first receivers developed in the laboratory were based on surface acoustic waves filters. Progress in microelectronics meant that these analog components could be replaced by dedicated programmable digital circuits which performed all the baseband processing. The resulting flexibility has allowed us to develop high bit rate systems (up to 10 Mbits/s). Particularly well-suited for multipath environments, this technique has potential applications in a wide variety of areas, for example indoor video monitoring track-to-train communications in metro systems and communications between the head and the rear of heavy-long trains.
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