Modular device for multiple reception of a modulated signal
A reception device includes a number of reception paths and a decoder. The reception paths are sequenced and each reception path includes a calculation module embodied to deliver a combined confidence index and a combined data stream, from the confidence index and the equalized data stream for the current path, as well as, for the subsequent reception paths after the first path, from the combined confidence index and the combined data stream, for the preceding path. The decoder is embodied to only process the combined confidence index and the combined data stream, provided by the calculation module in the last path.
1. An apparatus for receiving a modulated signal, said apparatus comprising:
a plurality of successive reception channels configured to receive a data stream corresponding to the modulated signal, each reception channel comprising:
a module for determining a confidence index of the received data stream, and
an equalization module configured to issue a stream of equalized data from the received data stream and from the confidence index,
a calculation module,
wherein the calculation module of the first reception channel is configured to issue a combined confidence index and a stream of combined data from the confidence index and from the stream of equalized data of the first reception channel, and
wherein the calculation module of each reception channel following the first reception channel is configured to issue a combined confidence index and a stream of combined data from:
the confidence index of the current channel,
the stream of equalized data of the current channel,
the combined confidence index of the preceding channel, and
a stream of combined data of the preceding reception channel,
a decoder configured to process the combined confidence index and the stream of combined data issued only from the calculation module of the last channel.
2. The apparatus according to claim 1 ,
wherein the calculation module of each reception channel following the first reception channel comprises a first elementary calculation means configured to generate the combined confidence index (CCSI i ) from:
the confidence index (CSI i ) of the current channel, and
the combined confidence index (CCSI i-1 ) of the preceding channel; and wherein CCSI i =CSI i +CCSI i-1 .
3. The apparatus according to claim 2 ,
wherein the calculation module of each reception channel following the first reception channel comprises a second elementary calculation means configured to generate a weighting coefficient α i and the complement of the weighting coefficient α i relative to 1 from the combined confidence indices CCSI i-1 and CCSI i-1 , for the current and preceding reception channels and
wherein α i =CCSI i-1 /CCSI i .
4. The apparatus according to claim 3 ,
wherein the calculation module of each reception channel following the first reception channel comprises a third elementary calculation means configured to generate the stream of combined data CZ i , from;
the stream of combined data CZ i-1 of the preceding channel,
the data stream Z i , of the current reception channel, and
the weighting coefficient α i of the current channel, and
wherein CZ i =α i ×CZ i-1 +(1−α i )×Z i .
5. The apparatus according to claim 1 , wherein the calculation module of each reception channel following the first reception channel comprises a synchronization module configured to synchronize the stream of combined data and the combined confidence index issued by the preceding reception channel, and the data stream and the confidence index issued by the current reception channel.
6. The apparatus according to claim 1 , wherein each reception channel comprises means for formatting the received data stream, said means for formatting comprising at least one of the following elements: a tuner, an amplifier and a converter.
7. The apparatus according to claim 1 wherein the input is a multi-carrier signal.
8. The apparatus according to claim 7 , wherein the input signal is an OFDM or COFDM signal.
9. The apparatus according to claim 7 , wherein the input signal include receive television signals.