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Adaptive Frequency Division Multiplexing wherein Channel Maps are transmitted such that whole copy always falls within Receiver Bandwidth
Adaptive Frequency Division Multiplexing wherein Channel Maps are transmitted such that whole copy always falls within Receiver Bandwidth
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机译:自适应频分复用,其中传输信道映射,以使整个副本始终落在接收机带宽内
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摘要
An adaptive FDM (Frequency Division Multiplex) system, possibly for DVB-C (Digital Video Broadcasting - Cable) COFDM application, where the frequency bands for TS (transport streams) 330 are of variable width. Superframes comprise a preamble 310, L1 (layer 1) control data 320 including a map detailing the TS centre frequency 360, bandwidth, modulation, etc. and then one or more TS. Receivers have a maximum bandwidth 370 which may be less than the channel 300 bandwidth. The bandwidth of the L1 data is less than half the receiver bandwidth. Thus a copy of the L1 data can be received irrespective of the receivers centre frequency. Using the L1 data the receiver can then align itself to and receive a particular TS.
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