Coding of data stream

Abstract

Coding a data stream is provided, wherein the data stream comprises at least one packet having a given packet length and respective partitions of the at least one packet are coded with different error protection rates, the respective lengths of the respective partitions being determined by respective predetermined percentages of the packet length or a fraction of the packet length.

1 . A method of coding a data stream, the data stream comprising at least one packet having a given packet length, the method comprising: 
 coding respective partitions of the at least one packet with different error protection rates, wherein respective lengths of the respective partitions are determined by respective predetermined percentages of the packet length or of a fraction of the packet length; and    outputting the data stream with the respective partitions of the at least one packet coded with the different error protection rates.    
     
     
         2 . A method as claimed in  claim 1 , wherein the given packet length is determined as a distance between two markers in the data stream, wherein at least one of said two markers indicates a packet start.  
     
     
         3 . A method as claimed in  claim 1 , wherein the respective predetermined percentages are determined such that a first partition of the packet comprises at least a first original packet partition.  
     
     
         4 . A method as claimed in  claim 3 , wherein the respective predetermined percentages are determined such that a sum of the first partition of the packet and a second partition of the packet comprises at least the first original partition and a second original partition of the packet.  
     
     
         5 . A method of decoding a data stream, the received data stream comprising at least one packet having a given packet length, wherein respective partitions of the at least one packet have been coded with different error protection rates, wherein respective lengths of the respective partitions are determined by respective predetermined percentages of the packet length, the method comprising: 
 decoding the respective packet partitions with the different error protection rates; and    outputting the data stream having the respective packet partitions decoded with the different error protection rates.    
     
     
         6 . An encoder for coding a data stream, the data stream comprising at least one packet having a given packet length, the encoder comprising: 
 means for coding respective partitions of the at least one packet with different error protection rates, wherein respective lengths of the respective partitions are determined by respective predetermined percentages of the packet length or of a fraction of the packet length; and    means for outputting the data stream with the respective partitions of the at least one packet coded with the different error protection rates.    
     
     
         7 . A decoder for decoding a data stream, the received data stream comprising at least one packet having a given packet length, wherein respective partitions of the at least one packet have been coded with different error protection rates, wherein respective lengths of the respective partitions are determined by respective predetermined percentages of the packet length or a fraction of the packet length, the decoder comprising: 
 means for decoding the respective packet partitions with the different error protection rates; and    means for outputting the data stream having the respective packet partitions decoded with the different error protection rates.    
     
     
         8 . A transmitter for transmitting a data stream, the transmitter comprising: 
 an encoder according to  claim 6;  and    antenna means for transmitting the data stream.    
     
     
         9 . A receiver for receiving a data stream, the receiver comprising: 
 antenna means for receiving the data stream; and    a decoder as claimed in  claim 7 .    
     
     
         10 . A data stream comprising at least one packet having a given packet length, wherein respective partitions of the at least one packet have been coded with different error protection rates, wherein respective lengths of the respective partitions are determined by respective predetermined percentages of the packet length or a fraction of the packet length.  
     
     
         11 . A storage medium on which a data stream as claimed in  claim 10  has been stored.