专利名称：Multiresolution modulation with multicarrier
signals
发明人：Oshima, Mitsuaki申请号：EP00114574.7申请日：19930924公开号：EP1049282B1公开日：20021218
摘要：At the transmitter side, carrier waves are modulated according to an inputsignal for producing relevant signal points in a signal space diagram. The input signal isdivided into, two, first and second, data streams. The signal points are divided into signalpoint groups to which data of the first data stream are assigned. Also, data of the seconddata stream are assigned to the signal points of each signal point group. A difference inthe transmission error rate between first and second data streams is developed byshifting the signal points to other positions in the space diagram expressed at least in thepolar coordinate system. At the receiver side, the first and/or second data streams canbe reconstructed from a received signal. In TV broadcast service, a TV signal is divided bya transmitter into, low and high, frequency band components which are designated as afirst and a second data streams respectively. Upon receiving the TV signal, a receiver canreproduce only the low frequency band component or both the low and high frequencyband components, depending on its capability. Furthermore, a communication systembased on an OFDM system is utilized for data transmission of a plurality of subchannels,wherein the subchannels are differentiated by changing the length of a guard time slotor a carrier wave interval of a symbol transmission time slot, or changing the transmission
electric power of the carrier.
申请人：MATSUSHITA ELECTRIC IND CO LTD
地址：JP
国籍：JP
代理机构：Eisenführ, Speiser & Partner
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