COFDM digital television receivers for iterative-diversity reception

摘要

Receivers with capability for iterative-diversity reception of COFDM digital television transmissions of repeated similarly coded data are described. Also described are receivers with capabilities for receiving COFDM digital television transmissions in which earlier transmissions of coded data are later followed by subsequent transmissions of the same data differently coded. The receivers use maximal-ratio code combining techniques for repeated components in the COFDM digital television transmissions. The receivers use turbo decoding techniques for concatenated coding of data in the COFDM digital television transmissions.

主权项

1. A receiver apparatus for coded orthogonal frequency-division multiplex (COFDM) transmissions of digital television (DTV) signals, which COFDM transmissions each comprise a plurality of successive time-slices for conveying parallel concatenated redundant coding (PCCC) of convolutionally byte-interleaved lateral Reed-Solomon (LRS) forward-error-correction (FEC) codewords that encode 188-byte packets of digital information, a prescribed number of which said successive time-slices are included in each of successive super-frames of prescribed duration, at least one of said time-slices included in each of said successive super-frames being an initial coded transmission of data repeated in a final coded transmission of the same data within one of said time slices included in a subsequent one of said successive super-frames occurring a prescribed interval later in time, said receiver apparatus comprising:
demodulation apparatus responding to a selected radio-frequency analog COFDM signal for supplying unmodulated pilot carrier waves and any carrier waves modulated by Transmission Parameters Signaling (TPS) as a first output signal therefrom and for supplying complex samples of quadrature-amplitude-modulation (QAM) of further carrier waves as a second output signal therefrom; a processor of said unmodulated pilot carrier waves and said any carrier waves modulated by TPS; a frequency-domain channel equalizer for equalizing said complex samples of QAM of said further carrier waves, said equalizing being performed responsive to said unmodulated pilot carrier waves; and combinative apparatus for extracting said coded transmissions of data from said complex samples of said QAM of said further carrier waves after their equalization, for combining each said initial coded transmission of data from at least one of said time-slices included in each of said successive super-frames with said final coded transmission of the same data from one of said time-slices time slices included in a subsequent one of said successive super-frames occurring a prescribed interval later in time, and for decoding coded transmissions resulting from such combining.