Turbo equalizer of ultra-wideband transmitted-reference receiver under inter-symbol interference

Based on ultra-wideband (UWB) transmitted reference (TR) technology, the interference model is analyzed for time division multiple access (TDMA) systems with conventional pulse pair structure, in which received reference and data received waveforms are both contaminated by inter-pulse interference. The inter-symbol interference model was demonstrated to be a second-order non-linear system and model coefficients are determined by received waveform correlation matrix. A non-overlapped pilot pulses structure was presented to estimate the model coefficients. Modified turbo equalization algorithm is adopted to equalize the second-order non-linear inter-symbol interference (ISI). Simulation result shows that, for the IEEE 802.15.3a's indoor multipath channel model, the turbo equalization principle is still effective in TR non-linear ISI systems.