Patent ID: 7263133

Claim:
A multiple-input multiple-output (MIMO)-based multiuser orthogonal frequency division multiplex (OFDM) multiband of ultra wideband (UWB) base station communication transmitter comprising: p user bitstream coupled to p convolution encoders, where p is an integer and greater than 1; said p convolution encoders coupled to p interleavers; p outputs of said p interleavers spread out by p user keys to form an encoded sequence by a sum over a block; each of said p user keys is a unique and orthogonal each other; said sum over a block coupled to a polyphase-based multiband; wherein said polyphase-based multiband includes a random access memory (RAM) bank with a length size of N for storing serial input data and P RAM banks with a length size of N/P for storing parallel output data, where N, and P are integers and greater than 1, N is greater than P, and N/P is an integer; said polyphase-based multiband coupled to k serial-to-parallel (S/P), where k is an integer and greater than 1; said k S/P coupled to k inverse fast Fourier transforms (IFFTs); said k IFFTs coupled to k guards; said k guards coupled to k filtering and spreading units; said k filtering and spreading units coupled to a MIMO-based multiband and multicarrier radio frequency (RF) unit; and said MIMO-based multiband and multicarrier RF unit coupled to k antennas.