Device and method for data encoding and frequency diversity in mobile communications system

A device for generating a code set in a mobile communications system having Nf frequency channels and Np phase channels, comprising:

• means for determining a code length Nc from said Nf and said Np;
• means for setting a minimum distance Nd between codewords in a code set, setting frequency diversity Nfd, and detecting code sets in accordance with Nc, Nd, and Nfd;
• and
• means for selecting a code set having a Hamming distance distribution among code words which minimizes demodulation errors from the detected code sets, and storing the code set in a mapping table of a demodulator.

A transmitter in a mobile communications system, comprising:

• a source coder for encoding transmission data;
• a channel coder for channel-encoding the output of the source coder;
• a waveform modulator for mapping the channel-encoded data to corresponding code words, including a serial-to-parallel converter for converting the channel-encoded data to parallel data, and a codeword modulator having a code set table which stores a predetermined code set, whereby said codeword modulator address-maps the parallel data and selects corresponding codewords from said code set table;
• and
• a transmitting portion for transmitting a codeword received from the waveform modulator on a plurality of channels;
• wherein said codewords of said code set table have a code length equal to the product of a number of available frequencies and a number of available phase channels in said communication system.

A method for transmitting data in a mobile communications system, comprising the steps of:

• encoding source data to be transmitted;
• channel-encoding the encoded source data;
• converting the channel-encoded data to parallel data;
• address-mapping the parallel data in a code set table;
• selecting a corresponding codeword from said code set table and modulating the waveform of the selected codeword;
• and
• transmitting the waveform-modulated codeword on as many channels equal to the product of a number of available frequency channels and a number of available phase channels in said communications system.