Multiuser DSSS-OFDM multiband for ultra wideband communications

A multiuser direct sequence spread spectrum (DSSS) orthogonal frequency division multiplexing (OFDM) multiband of ultra wideband (UWB) communication system comprising:

• N UWB mobile stations, where N is an integer and greater than 1;
• an UWB basestation coupled to an UWB network interface that is connected to an UWB network;
• said UWB basestation further including P convolution encoders, P interleavers, P multipler modules, P user keys, a summation, a multiband splitter, M serial-to-parallel (S/P) converters, an inverse fast Fourier transforms (IFFT) unit, M guards, M filtering units, a multiband multicarrier modulation, and a power amplifier (PA), where P and M are integers and greater than 1;
• said summation is a block-based operation;
• said P user keys generating P different sequences;
• each of said P user keys spreading with each output of said P interleavers by each of said P multipler modules;
• said UWB basestation receiving N different UWB signals from said N UWB mobile stations;
• said UWB basestation transmitting N user's UWB signals containing N different user keys to N UWB mobile stations;
• and
• each of said N UWB mobile stations transmitting UWB signals including one user key to said UWB basestation.