Transmitted-reference impulse radio systems based on selective combining

Abstract—Transmitted-reference impulse radio with autocor-relation receiver (TR-IR/AcR) generally requires wideband ana-log delay line (WADL) with length of several tens nanoseconds. To maximally reduce the length, we propose a TR-IR system based on selective combining, which intelligently selects integration regions for symbol detection. It was shown that when the WADL with a total length of 8 ns is employed, the proposed system has a signal-to-noise ratio gain of 0.5 dB, 2.3 dB, 2.3 dB and 3.7 dB over the TR-IR/AcR at bit-error-rate of 10−5 for ultra-wideband channel models CM 1 ∼ 4, respectively. Index Terms—Transmitted-reference (TR), impulse radio (IR), selective combining (SC), ultra-wideband (UWB). I