Device and method for interleaving data blocks for an optical communications system between a satellite and an earth station

A device for deinterleaving data blocks for an optical communications system between a satellite and an earth station, said deinterleaving device configured to receive as input sets of L interleaved data blocks, and to provide as output data frames including ordered data blocks,

• said deinterleaving device comprising a control module and an external memory configured to store the ordered data blocks, and a cache memory comprising a plurality of buffer areas, wherein each of the buffer areas has a size of at least a size of one of the sets of the interleaved data blocks,
• the control module configured to:
• write in an available one of the buffer areas each of the sets of the L interleaved blocks successively received,
• form groups of the ordered data blocks from different ones of the data blocks belonging to different ones of the sets of the L interleaved data blocks stored in different ones of the buffer areas,
• write each of the groups of the ordered blocks in a sequential area of the external memory,
• wherein each of the buffer areas is available if and only if the buffer area does not contain any of the interleaved data blocks that has not yet been used to form one of the groups of the ordered blocks to be written in the external memory.

A method for interleaving data blocks by an interleaving device for interleaving data blocks for an optical communications system handling communications between a satellite and an earth station, said interleaving device configured to receive as input data frames each comprising a plurality of ordered data blocks, and to provide as output interleaved data blocks,

• said interleaving device comprising:
• a control module, an external memory configured to store the interleaved blocks, and a cache memory comprising a plurality of buffer areas, each of the buffer areas has a size at least equal to a size of one of the data frames,
• said method comprising:
• writing each new one of the data frames received in an available buffer area of the buffer areas,
• forming groups of the interleaved data blocks from different ones of the ordered data blocks belonging to different ones of the frames stored in different ones of the buffer areas,
• writing each of the groups of the interleaved blocks in a sequential area of the external memory,
• wherein each of the buffer areas is available if and only if the buffer area does not contain any of the ordered data blocks that has not yet been used to form one of the groups of the interleaved blocks to be written in the external memory.

A method of deinterleaving data blocks by a deinterleaving device configured for deinterleaving data blocks for an optical communications system handling communications between a satellite and an earth station,

• said deinterleaving device configured to receive as input sets of L interleaved data blocks, and to provide as output data frames including ordered data blocks,
• said deinterleaving device comprising a control module, an external memory to store the ordered data blocks, and a cache memory comprising a plurality of buffer areas each having a size at least equal to the size of one of the sets of the L interleaved blocks, said deinterleaving method comprising:
• writing in an available one of the buffer areas each of the sets of the L interleaved blocks successively received,
• forming groups of the ordered data blocks from different ones of the interleaved data blocks belonging to different ones of the sets of the interleaved data blocks stored in different ones of the buffer areas,
• writing each of the groups of the ordered data blocks in a sequential area of the external memory,
• wherein each of the buffer areas is available if and only if the buffer area does not contain any of the interleaved data blocks that has not yet been used to form one of the groups of the ordered data blocks to be written in the external memory.