Bi-directional communication channel
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[0108] A preferred embodiment of the present invention will now be described by way of example and with reference to the accompanying drawings.
[0109]FIG. 1 illustrates a prior art digital information broadcasting system using OFDM. The system includes a base station 1 that transmits to a plurality of subscriber units 2.
[0110] A data input channel 11 brings to the base station 1 the video, audio and / or data to be broadcast to the subscriber units 2.
[0111] An information processor 12 performs the required modulation, using for example QPSK, M-QAM, M-DAPSK or another digital modulation method. The OFDM transmitter 13 includes means (not shown) for performing an Inverse FFT (IFFT), DAC means for converting the digital signals to an analog voltage and for generating an RF signal modulated accordingly. The RF signal is then transmitted through antenna 14 and the wireless channel to the subscriber units 2.
[0112] A subscriber unit 2 (receiver) includes means for performing the abovedeta...
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