Karl Heinz Möhrmann

ATM-based wireless broadband access in the local loop

Broadband networks using wireless transmission techniques are a quick and flexible means of implementing subscriber access. Unoccupied frequency bands with sufficient bandwidth to allow the transmission of digital signals at very high bit rates are found only in the microwave bands. Because the path loss is fairly high at these frequencies, the diameter of radio cells is limited to a maximum of a few kilometres. This results in a microcellular system, which is best implemented in the form of a point-to-multipoint system, where one radio-base station serves all subscribers registered in that radio cell. An interactive, broadband, ATM-based radio local loop has undergone successful trials in Munich. Copyright