Patent ID: 8687646
Filing Date: 2014-04-01
Classification: H04L

Abstract:
1. A method for bit and power allocation, comprising: determining a set of candidate modulation modes for sub-channels; constructing a signal-to-noise ratio (SNR) lookup table according to a predetermined target bit error rate (BER), the SNR lookup table containing a relationship of an SNR and the number of bits corresponding to a modulation mode in the set of candidate modulation modes at the predetermined target BER; obtaining normalized SNRs on the sub-channels; initializing the numbers of bits for the sub-channels; initializing powers for the sub-channels according to the numbers of bits for the sub-channels, the normalized SNRs on the sub-channels and the SNR lookup table; and adjusting the numbers of bits and the powers for the sub-channels in accordance with a principle of maximizing power utilization rate, the adjusted numbers of bits and powers for the sub-channels being taken as a result of bit and power allocation for the sub-channels, wherein for an M-QAM modulation mode, the SNR lookup table is constructed with BER calculation formulas of when the number of bits is 3; when the number of bits is 2p and p is a positive integer; and when the number of bits is 2p+1, p is a positive integer and p≧2, wherein BER wherein for an M-PSK modulation mode, the SNR lookup table is constructed with BER calculation formulas of when the number of bits is p, p is a positive integer and p≧3, wherein BER