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    • 29. 发明公开
    • BANDWIDTH ASYMMETRIC COMMUNICATION SYSTEM
    • 带宽非对称通信系统
    • EP2041891A1
    • 2009-04-01
    • EP07766759.0
    • 2007-06-15
    • Koninklijke Philips Electronics N.V.
    • DU, Yonggang
    • H04B7/26
    • H04L5/143H04B7/2621H04L5/0021H04L5/005H04L5/0053H04L5/0064
    • The present invention relates to a communication system comprising a plurality of terminals each having an uplink transmission unit (1) for transmitting radio frequency OFDM signals at a radio frequency and an access point having an uplink receiving unit (4) for concurrently receiving said radio frequency OFDM signals from at least two terminals, said OFDM signals being Orthogonal Frequency Division Multiplex (OFDM) modulated, wherein the bandwidth of said uplink transmission units and of the transmitted radio frequency OFDM signals is smaller than the bandwidth of said uplink receiving unit and that the bandwidth of at least two uplink transmission units and of their transmitted radio frequency OFDM signals is different. The present invention relates further to a communication system wherein the access point has a downlink transmission unit (7) for transmitting radio frequency OFDM signals at a radio frequency and that the at least two terminals each have a downlink receiving unit (11) for receiving said radio frequency OFDM signals, wherein the bandwidth of said downlink transmission unit is larger than the bandwidth of said downlink receiving units and that the downlink transmission unit is adapted to generate and transmit radio frequency OFDM signals having a bandwidth that is smaller than or equal to the bandwidth of the downlink transmission unit and that is equal to the bandwidth of the downlink receiving unit by which the radio frequency OFDM signals shall be received. Still further, the present invention relates to a communication method, to a terminal and to an access point for use in such a communication system.
    • 本发明涉及包括多个终端的通信系统,每个终端具有用于以射频发射射频OFDM信号的上行链路发射单元(1)和具有用于同时接收所述射频的上行链路接收单元(4)的接入点 来自至少两个终端的OFDM信号,所述OFDM信号是正交频分复用(OFDM)调制的,其中所述上行链路传输单元和所传输的射频OFDM信号的带宽小于所述上行链路接收单元的带宽,并且所述 至少两个上行传输单元及其传输的射频OFDM信号的带宽不同。 本发明还涉及一种通信系统,其中接入点具有用于以射频发射射频OFDM信号的下行链路发射单元(7),并且该至少两个终端各自具有下行链路接收单元(11),用于接收所述 射频OFDM信号,其中所述下行链路传输单元的带宽大于所述下行链路接收单元的带宽,并且所述下行链路传输单元适于产生和传输具有小于或等于所述下行链路接收单元的带宽的射频OFDM信号 下行传输单元的带宽并且等于下行接收单元的带宽,其中应该接收射频OFDM信号。 更进一步地,本发明涉及一种通信方法,涉及用于这种通信系统的终端和接入点。