2009, Vol.12, No.1, pp.27-36
This work is devoted to investigation of statistical properties of
ensemble of ultrawideband (UWB) wireless channels of a given class
of indoor channel models from the point of view of achievable
bitrates for a prescribed value of Bit-Error-Ratio (BER) in the
direct chaotic communication scheme (DCCS), when the bitrate is
limited by the multipath interference. The evaluation was done by
means of direct numerical simulation of noncoherent reception of
chaotic signals that came through multipath channels, whose pulse
response functions were obtained from the statistical model of
multipath channels of IEEE 802.15.3a working group. In
approximation of dominant multipath interference (multipath
propagation), for the chaotic signal bandwidths 500 and 2000 MHz
the fraction of channels with practically important BER providing
bitrates 10 to 50 Mbps was evaluated (PB ~
10-5...10-4). For the first time the
role of a small fraction of channels (less than 5...20%)
with high BER PB is found that has essential effect on the
BER vs bitrate 
averaged over ensemble of channels
of the given class. It was shown that the value
is practically important characteristic of significant fraction of
channels (~ 80...95%).
Key words:
chaotic signal, wireless channel, multipath interference, network
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