In this paper, we present a novel M-ary modulation scheme enhanced
by zero correlation zone(ZCZ) sequences to attenuate the multipath
dispersion in the indoor infrared communication systems. It is
proved to offer a high speed infrared communication with good
bit-error-rate(BER) performance and bandwidth efficiency.
In this paper, we propose a DSSS transmission scheme called T-ZCZ
(Three Zero Correlation Zone) Keying for indoor infrared
communications. This scheme can successfully remove inter-symbol
interference (ISI) incurred by multipath dispersion and improve
the system throughput drastically. We present the system modelling
and show that it can offer a better Bit-Error-Ratio(BER)
performance and higher data transmission rate, especially in
multipath infrared channels for multiple users.