/spl alpha/-repetition/modulation and blind second-order identification

In the context of redundant filter-bank precoders for blind second-order equalization, we consider the /spl alpha/-repetition/modulation scheme. Although it is theoretically possible, the identification of a bandlimited communication channel suffers from numerical problems if /spl alpha/ is beyond a bound. If /spl alpha/ is below this bound, simulation examples illustrate the robustness of the channel estimate.