| 主权项 |
1. A data processing apparatus configured to map data symbols received from a predetermined number of sub-carrier signals of Orthogonal Frequency Division Multiplexed OFDM symbols into an output data stream, wherein
the predetermined number of sub-carrier signals are determined in accordance with one of a plurality of operating modes and the data symbols are divided into first sets of data symbols and second sets of data symbols, the data processing apparatus comprising: an interleaver configured to perform an odd interleaving process which interleaves the first sets of data symbols from the sub-carrier signals of first OFDM symbols into an output data stream and an even interleaving process which interleaves the second sets of data symbols from the sub-carrier signals of second OFDM symbols into the output data stream, and an interleaver memory, the odd interleaving process including writing the first sets of data symbols recovered from the sub-carrier signals of the first OFDM symbols into the interleaver memory in accordance with an order defined by a permutation code, and reading out the first sets of data symbols from the interleaver memory in a accordance with a sequential order into the output data stream, the even interleaving process including writing the second sets of data symbols recovered from the sub-carrier signals of the second OFDM symbols into the interleaver memory in accordance with a sequential order, and reading out the second sets of data symbols from the interleaver memory in accordance with an order defined by the permutation code into the output data stream, such that while data symbols from the first set are being read from locations in the interleaver memory, data symbols from the second set can be written to the locations just read from and when data symbols from the second set are being read from the locations in the interleaver memory, the data symbols from a following first set can be written to the locations just read from, wherein when the number data symbols which can be carried by the sub-carriers of an OFDM symbol in one or more 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 data symbols from both the first and second sets in accordance with the odd interleaving process from the first and second OFDM symbols, and to change the permutation code which is used to form the addresses from one OFDM symbol to another. |
