Site-specific BER analysis in frequency-selective channels using a ray-tracing propagation model

The increasing use of wideband digital mobile communication systems has placed new requirements on the channel models which are used to assess system performance. A technique is presented for calculating the bit error rate (BER) for coherent QPSK in frequency-selective channels using site-specific channel response characteristics. The details of the channel response are found from a ray-tracing propagation model which provides unique, realistic fading-dependent time signatures for each analysis location in the propagation environment. The channel time signatures are used for a direct estimate of intersymbol interference (ISI) which can then yield an estimate of wideband BER. The technique offers a more incisive calculation of BER in frequency-selective channels for real propagation circumstances than is possible with previously-used methods. The technique can be adapted to other modulation types and general co-channel interference problems.