| 摘要 |
<p>The present invention relates to a method for bit allocation in a multicarrier or discrete multi tone (DMT) modulated transmission system, in which a number of carriers N and a number of bits B are limited, the former due to useable frequency band and carrier spacing and the latter due to bit rate and block size. The invention comprises associating a quality factor 1j to each carrier j, j = 1, ..., N, computing a loading constant Lc as the quotient of a difference and the number of carriers Nr that have no bits allocated, said difference being the difference of the sum of the bit error rates 1k for carriers k, k = 1, ..., Nr, that have no bits allocated and the total remaining number of data bits nr that are not allocated, allocating a number of bits ni to a carrier i that has no bits allocated, said number of bits ni being the difference of the quality factor li and the loading constant Lc rounded to nearest integer, repeating the step of allocating until a predetermined fraction of the carriers k have bits allocated, and reiterating the steps of computing, allocating and repeating until all carriers j have bits allocated.</p> |
