Data packet processing for estimation of a direction towards a transmitter

A method comprising:

• inserting an anti-whitened data block, which is obtainable from a specific data block by anti-whitening, into a data block that is to be whitened by a whitening to yield a whitened data block, wherein said anti-whitening compensates said whitening so that said whitened data block will comprise said specific data block in non-whitened form, and wherein said specific data block is designed to be used by a receiver of said whitened data block to estimate a direction towards a transmitter of said whitened data block based on a received representation of said specific data block.

A method comprising:

• receiving input data blocks;
• outputting, in a first operating mode, an output data block generated by whitening or de-whitening one of said input data blocks, which does not comprise a specific data block, in its entirety, and
• outputting, in a second operating mode, an output data block generated by whitening or de-whitening all parts of one of said input data blocks, which comprises said specific data block, under exclusion of said specific data block, so that said output data block comprises said specific data block in unchanged form, wherein said specific data block is designed to be used by a receiver of said output data block to estimate a direction towards a transmitter of said output data block based on a received representation of said specific data block.

A computer program product comprising a non-transitory computer readable storage medium encoded with instructions that, when executed by a processor, causes an apparatus at least to perform:

• receiving input data blocks;
• outputting, in a first operating mode, an output data block generated by whitening or de-whitening one of said input data blocks, which does not comprise a specific data block, in its entirety, and
• outputting, in a second operating mode, an output data block generated by whitening or de-whitening all parts of one of said input data blocks, which comprises said specific data block, under exclusion of said specific data block, so that said output data block comprises said specific data block in unchanged form, wherein said specific data block is designed to be used by a receiver of said output data block to estimate a direction towards a transmitter of said output data block based on a received representation of said specific data block.

A computer program product comprising a non-transitory computer readable storage medium encoded with instructions that, when executed by a processor, causes an apparatus at least to perform:

• inserting an anti-whitened data block, which is obtainable from a specific data block by anti-whitening, into a data block that is to be whitened by a whitening to yield a whitened data block, wherein said anti-whitening compensates said whitening so that said whitened data block will comprise said specific data block in non-whitened form, and wherein said specific data block is designed to be used by a receiver of said whitened data block to estimate a direction towards a transmitter of said whitened data block based on a received representation of said specific data block.