Apparatus and method for transmitting header information in an ultra wide band communication system

A method for decoding in a receiver physical layer header information symbols, which have been encoded with a coding rate of (2k, 2 k+1) and transmitted through a frame having physical layer header information, in an ultra wide band (UWB) communication system in which a plurality of devices have the receiver constitute a piconet and data transmission between the plurality of devices is performed through the frame, said method comprising the steps of:

• a) generating (2k−1) mask sequences, each having an inherent mask sequenceindex;
• b) receiving, as inputs, the mask sequences and an encoded physical layer header information symbol sequence of length 2k;
• c) performing AND operations respectively between the mask sequences and the encoded physical layer header information symbol sequence;
• d) outputting physical layer header information symbol sequences from which the mask sequences are removed;
• e) receiving, as inputs, the encoded physical layer header information symbol sequence and the physical layer header information symbol sequences from which the mask sequences are removed;
• f) calculating correlation values respectively between each of the symbol sequences and a plurality of bi-orthogonal Walsh codes, each code having an inherent Walsh code index;
• g) outputting, for each of the symbol sequences, a largest one of the calculated correlation values, a corresponding mask sequence index, and a Walsh code index corresponding to the largest correlation value;
• and
• h) comparing the output correlation values corresponding respectively to the symbol sequences;
• combining together a Walsh code index and a mask sequence index, both corresponding to a largest one of the compared correlation values;
• and
• i) outputting the combined indices as (2 k+1)-bit physical layer header information.

An apparatus for protecting and transmitting by a transmitter physical layer header information of respective header information of layers, in an ultra wide band (UWYB) communication system in which a plurality of devices have the transmitter constitute a piconet and data transmission between the plurality of devices is performed through a frame having said respective header information of the layers, said apparatus comprising:

• a bi-orthogonal sequence generator for generating a bi-orthogonal sequence by performing an AND operation between more significant bits of physical layer header information bits and predetermined basis Walsh code sequences;
• a mask sequence generator for generating a mask sequence by performing an AND operation between less significant bits of the physical layer header information bits and predetermined mask sequences;
• and
• an exclusive OR element for performing an exclusive OR operation on a symbol-by-symbol basis between the bi-orthogonal sequence output from the bi-orthogonal sequence generator and the mask sequence output from the mask sequence generator, so as to output a single encoded symbol sequence.

A method for protecting and transmitting by a transmitter physical layer header information, of respective header information of layers, in an ultra wide band (UWB) communication system in which a plurality of devices have the transmitter constitute a piconet and data transmission between the plurality of devices is performed through a frame having said respective header information of the layers, said method comprising the steps of:

• a) generating a bi-orthogonal sequence by performing an AND operation between more significant bits of physical layer header information bits and predetermined basis Walsh code sequences;
• b) generating a mask sequence by performing an AND operation between less significant bits of the physical layer header information bits and predetermined mask sequences;
• c) performing an exclusive OR operation on a symbol-by-symbol basis between the generated bi-orthogonal sequence and the generated mask sequence, and
• d) outputting a single encoded symbol sequence.