Title :
A maximum rate loading algorithm for discrete multitone modulation systems
Author :
Leke, Achankeng ; Cioffi, John M.
Author_Institution :
Inf. Syst. Lab., Stanford Univ., CA, USA
Abstract :
A novel approach to loading for discrete multitone modulation (DMT) systems is proposed. This algorithm assigns energy to different subchannels in order to maximize the data rate for a given margin while previous algorithms proposed are aimed mainly at maximizing the margin at a target data rate. Two implementations are suggested, both with finite granularity: the first one leads to the optimal waterfilling solution, and the second results in a suboptimal but slightly less complex flat-energy distribution. The algorithm is extended to the case of a rate adaptive system with both a target guaranteed fixed data rate service and a variable one. Simulation results are presented for a Rayleigh fading channel with additive white Gaussian noise
Keywords :
Gaussian noise; Rayleigh channels; adaptive systems; fading; modulation; white noise; Rayleigh fading channel; additive white Gaussian noise; data rate; discrete multitone modulation systems; maximum rate loading algorithm; optimal waterfilling solution; rate adaptive system; simulation results; suboptimal flat-energy distribution; Adaptive systems; Additive white noise; Decoding; Fading; Fourier transforms; Information systems; Laboratories; OFDM modulation; Telecommunication standards; Transmitters;
Conference_Titel :
Global Telecommunications Conference, 1997. GLOBECOM '97., IEEE
Conference_Location :
Phoenix, AZ
Print_ISBN :
0-7803-4198-8
DOI :
10.1109/GLOCOM.1997.644387
