Patent ID: 6959020

Claim:
A method of demultiplexing a multiplexed signal, said multiplexed signal comprising packet data units, the packet data units including data packets belonging different logical channels, the packet data units being delimited by framing flags, the method comprising: searching for said framing flags from a received multiplexed signal and de-framing the packet data units with reference to the framing flags; demultiplexing the data packets belonging to the different logical channels from the packet data units and assembling them into demultiplexed signals, detecting invalidity of a demultiplexed signal by examining errors encountered while de-framing the packet data units; adding error location to the demultiplexed signal, the error location information indicating the location of erroneous bits in the demultiplexed signal; and forwarding a demultiplexed—signal to a corresponding decoder for the logical channel and further providing the decoder with an error type indication—for use by the decoder during decoding of the demultiplexed signal to enable recovery from the error.