| 摘要 |
2101944 9214306 PCTABS00014 A transmitter (10) is provided with a distribution preserving Tomlinson coder (25) which predistorts shaped data signals (20) such that the power of each data signal exiting the coder is substantially similar to the power of the data signal entering the coder and such that upon transmission of the predistorted data signal over a channel (40), the effect of ISI of the channel is substantially removed. The transmitter is primarily intended for coded modulation systems utilizing a ''coset'' code, and the predistortion is preferably accomplished according to a linear function (1), where rk is a data signal entering the coder, a1 and b1 are the coefficients of polynomials relating to the channel impulse response, xk is the predistorted data signal exiting the coder, and sk is chosen to cause the signal power of xk on average to approximately equal the signal power of rk on average. Different methods for so choosing sk are disclosed. Receivers (50) which cooperate with the provided transmitters (10) are also provided.
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