| 摘要 |
In a wireless broadband system comprising a base transmitting to a plurality of subscribers, means for achieving an interactive bi-directional system comprising transmitter means in the subscriber system for transmitting signals which are orthogonal to the signals transmiteed from other users arriving at the base station. A method for achieving an interactive bi-directional system comprising the steps of: A. using a subscriber transmitter with an upstream physical layer based on the use of a combination of Time Divison Multiple Access and Orthogonal Frequency Division Multiple Access; B. dividing the upstream into a number of "time slots" as defined by the MAC layer; C. controlling, in the MAC layer, the assignment of subchannels and time solts by bandwidth on demand and Data Rate on demand. |
