This paper presents two methods for approximating the performance of codedmulticarrier systems operating over frequency-selective, quasi-static fadingchannels with non-ideal interleaving. The first method is based onapproximating the performance of the system over each realization of thechannel, and is suitable for obtaining the outage performance of this type ofsystem. The second method is based on knowledge of the correlation matrix ofthe frequency-domain channel gains and can be used to directly obtain theaverage performance. Both of the methods are applicable forconvolutionally-coded interleaved systems employing Quadrature AmplitudeModulation (QAM). As examples, both methods are used to study the performanceof the Multiband Orthogonal Frequency Division Multiplexing (OFDM) proposal forhigh data-rate Ultra-Wideband (UWB) communication.
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