Multicarrier DS/CDMA system using a turbo code with nonuniform repetition coding

A multicarrier direct sequence code division multiple access (DS/CDMA) system using a turbo code with nonuniform repetition coding comprising:

• a turbo encoder for encoding input data bits;
• a repeater/symbol mapper for replicating the turbo code symbols outputted from said turbo encoder into repetition code symbols in frequency domain and mapping said replicated repetition code symbol signals appropriately;
• at least one first interleaver for changing channels for the turbo code symbols outputted from said repeater/symbol mapper so that the fading effect is properly distributed on the codeword symbols;
• at least one first multiplier for multiplying a signature sequence to the turbo code symbols, which are properly rearranged by said at least one first interleaver, for band-broadening;
• at least one impulse modulator for modulating the band-broadened signals from said at least one first multiplier to an impulse shape;
• at least one chip wave-shaping filter for smoothening the waveform of the output signals from said at least one impulse modulator and eliminating the interference between the symbols;
• at least one second multiplier for mapping the output signals from said at least one chip wave-shaping filter to each frequency band;
• a first adder for adding all the output signals from said at least one second multiplier and transmitting the signals;
• and
• a reception system for receiving the transmitted signals from said first adder.