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We have developed the evolutionary statement for the Saleh-Valenzuela by adding incremental statements delta phi and delta theta to the AoD and AoA, as is shown in the channel transfer function. We assume that the angular variations are small to substitute the sine and cosine with their small angle approximations. Since the AoD and AoA are best modeled using the random process, we model the angular variations using the autoregressive random process. In summary, the idea is to update the AoD and AoA as an autoregressive random process, then reconstruct the tracked channel using the evolutionary channel model. At time t plus delta t, the evolutionary channel can be represented as the Hadamard product of the channel transfer function at time t and the incremental steering vectors.
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IEEE/ICACT20210129 Slide.08
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