Abstract
The performance of a multitone QAM system, operating over an attenuating channel with additive white Gaussian noise is considered. The overall data rate is optimized for a given symbol error probability by optimizing the power distribution amongst tones and the number of bits/symbol for each tone. It is shown that the transmitted power should be uniformly distributed over the channel, independent of the attenuation. However, each tone may have a different number of bits/symbol. The optimized multitone system is compared to single-tone systems using linear equalization at the receiver. The comparison shows that the multitone technique has large improvement only for channels with deep nulls (greater than 12 dB) over large sections of the channel band.
| Original language | English |
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| Pages (from-to) | 1704-1710 |
| Number of pages | 7 |
| Journal | Conference Record - International Conference on Communications |
| State | Published - 1987 |