Patent ID: 7660230

Claim:
An M-ary orthogonal coded/Balanced transmitted reference (TR) system for ultra wideband (UWB) communications, comprising: encoding data bits using M-ary orthogonal codes, generating a transmission signal according to the encoded data bits, using pairs of pulses separated by a time interval T d , each pair of pulses comprising an un-modulated first reference pulse and a second data pulse modulated by the encoded data bits, transmitting the transmission signal over a communication channel; receiving the transmission signal and balance-matched filtering the received transmission signal using a bank of (M+1) filters, where a first filter is matched to a received reference pulse of the transmission signal, while remaining M filters are matched to a received data pulse weighted by the M-ary orthogonal codes, respectively, delaying and correlating an output of the first filter with outputs of the remaining M filters, giving M correlated outputs, and decoding the encoded data bits based on the largest of the M correlated outputs.