TCH (Tomlinson, Cercas, Hughes) codes are very low rate
codes with good overall performance. Moreover, TCH sequences
have good auto-correlation characteristics, making
them suitable for spread spectrum systems. In this paper
we consider the use of TCH codes in standard UWB systems
(time-hopping and direct sequence employing pulseposition
and pulse-amplitude modulations) where performance
results are comparable to other pseudo-random
codes. A performance advantage is gained when TCH
codes are used for combined coding and spreading in Ultrawide
Band Systems.