Minimum mean squared error equalization for discrete multi-tone modulation
Tucker, Cary Dean
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Discrete multi-tone (DMT) modulation has found its applications in high data rate transmission through twisted-pair copper wire (such as, in Asymmetric Digital Subscriber Lines [ADSL]). The main drawback of the DMT design is the fact that the guard interval introduced to remove inter-symbol and inter-carrier interference has to be at least as long as the order of the channel impulse response. This limits the data rate as well as the distance over which DMT can be used. As an alternative to the currently popular time-domain equalizer, we investigate a MIMO FIR frequency domain equalizer optimized according to an MMSE criterion. Results show the tradeoff between computational complexity, achievable mean squared error and thus, data rate and signal delay.