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Apparatus for transmitting broadcast signals, apparatus for receiving broadcast signals, method for transmitting broadcast signals and method for receiving broadcast signals

  • US 10,044,545 B2
  • Filed: 01/08/2018
  • Issued: 08/07/2018
  • Est. Priority Date: 02/06/2015
  • Status: Active Grant
First Claim
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1. An apparatus for receiving broadcast signals, the apparatus comprising:

  • a receiver to receive the broadcast signals;

    a demodulator to demodulate the received broadcast signals by an OFDM (Orthogonal Frequency Division Multiplex) scheme according to Fast Fourier Transformation (FFT) sizes;

    a frequency de-interleaver to frequency de-interleave the demodulated broadcast signals based on an FFT size,wherein the frequency de-interleaver is configured to;

    generate a de-interleaving sequence based on a toggle bit, a basic de-interleaving sequence, and a symbol offset, when the FFT size is 32K, a single permutation is applied to the basic de-interleaving sequence, and when the FFT size is 8K or 16K, different permutations are applied to the basic de-interleaving sequence, andcheck whether or not an address of the interleaving sequence is within a range of an OFDM symbol with the FFT size; and

    de-interleave data in a signal frame in the demodulated broadcast signals using the generated de-interleaving sequence, when the address is within the range of the OFDM symbol; and

    a decoder to decode the de-interleaved data in the signal frame, andwherein, in a first FFT mode, the frequency de-interleaving is accomplished by switching alternatively two memories, and, in a second FFT mode, the frequency de-interleaving is accomplished by reading and writing operations for a single memory.

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