Patent ID: 7136370

Claim:
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.