Optimal Transmit Spectra for Communication on Digital Subscriber Lines
نویسندگان
چکیده
We present a general framework for designing optimal transmit spectra for symmetric bit-rate Digital Subscriber Line (DSL) services, in particular HDSL2. Using the channel and interference transfer functions and SNR estimates, we set up and solve an optimization problem to maximize the capacity. Sizable gains in performance margins (or bit rates) result. Furthermore, by design, the spectra are spectrally compatible with other services. While the framework is quite general — it does not depend on the exact choice of modulation scheme, for example — it is also extremely simple and of low computational complexity. Our results can be used either for dynamically adapting the signaling spectra to account for changing noise or interference conditions or for the design of new fixed transmit spectral masks using worst-case analysis.
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