Universal digital portable radio communications

摘要: Providing voice and data communications to people away from their wireline telephones has become a major communication frontier. This frontier is being penetrated by evolving approaches portable communications, e.g., cordless telephones, mobile radiotelephone, radio paging. However, these have many limitations; none can provide universal services. paper discusses limitations of the considers objectives for providing more digital as an integrated part telephone exchange networks. These could be accomplished using demand-assigned links last thousand feet or so loops sharing remainder fixed distribution facilities. Fixed ports parts networks placed throughout service regions. Efficient use spectrum insured planned reuse frequencies The severe multipath propagation environment within around buildings that strongly influences design systems described in paper. System configurations link techniques, reliable environment, are discussed. Radio system calculations illustrated with 30-ft-high antennas residential areas. indicate availability would greater than 99 percent 2000-ft port separations 5-mW transmitters. Reuse require dividing allocated frequency band into segments at adjacent ports. Calculations suggest cochannel interference percent, if 25 35 were used