Patent ID: 9100251
Filing Date: 2015-08-04
Classification: H04L

Abstract:
1. A data processing apparatus configured to map input data symbols to be communicated onto a predetermined number of sub-carrier signals of Orthogonal Frequency Division Multiplexed (OFDM) symbols, wherein the predetermined number of sub-carrier signals are determined in accordance with one of a plurality of operating modes and the input data symbols including first sets of input data symbols and second sets of input data symbols, the data processing apparatus comprising: modulator circuitry configured to embed data indicating the one of a plurality operating modes, an interleaver configured to perform an odd interleaving process which interleaves the first sets of input data symbols on to the sub-carrier signals of first OFDM symbols and an even interleaving process which interleaves the second sets of input data symbols on to the sub-carrier signals of second OFDM symbols, and an interleaver memory, the odd interleaving process comprising: the even interleaving process comprising: when the number data symbols which can be carried by the sub-carriers of an OFDM symbol in one of the plurality of operating modes is half or less than half of the number of data symbols, which can be carried in an operating mode which provides the most number of data bearing sub-carrier signals per OFDM symbol, the data processing apparatus is configured to interleave the input data symbols from both first and second sets in accordance with the odd interleaving process on to the first and second OFDM symbols, and the data processing apparatus is further configured to change the permutation code according to the one of a plurality of operating modes corresponding to the data embedded by said modulator circuitry.