- single-path time domain equalizer (TEQ) structure: single finite impulse response filter TEQ plus FFT plus one-tap frequency-domain equalizer (FEQ)
- dual-path TEQ structure: two parallel TEQs plus FFT plus one-tap FEQ
- per tone equalizer structure: equalization is customized for each subchannel (tone)

For the single-path TEQ, we have optimized bit rate at the output of the TEQ by developing the

- Maximum Bit Rate (MBR) method to find the optimal TEQ, and
- Minimum-ISI (Min-ISI) method to find the near-optimal TEQ

In the dual-path TEQ, one TEQ is design so as to optimize the achievable bit rate over the entire data transmission spectrum. The other TEQ is biased to selected subchannels to increase transmission throughput. Both the MBR and Min-ISI methods can be used to design both TEQs to optimize bit rate at the TEQ outputs.

In our version of per tone equalization, we use a bank of TEQs where each TEQ is tuned to a particular subchannel. A single-tap FEQ would still be used. The dual-path TEQ can be viewed as a special case of a time-domain per-tone equalizer, which uses a bank of TEQs plus FFT.

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