A New Adaptive Algorithm for Bit Allocation in DMT Modems
نویسنده
چکیده
This paper presents a new algorithm for distributing bits to the subchannels of a DMT modem. The so-called Inverse Robin Hood algorithm converges rapidly and can effectively optimise the overall bit error rate in a non-Gaussian channel. Key-words: Discrete multi-tone modulation, adaptive bit-loading, DSL modems, non-Gaussian channels.
منابع مشابه
Bit- and power-allocation algorithm for symmetric operation of DMT-based DSL modems
Discrete multi-tone (DMT) based digital subscriber loop (DSL) modems must allocate power and information bits to the discrete tones for quadrature amplitude modulation. The bitallocation (also referred to as bit-loading) algorithms in the literature are designed for modems that operate in the simplex mode in which the upstream and downstream signals use nonoverlapping frequency bands. However, ...
متن کاملAdaptive Subcarrier Assignment and Power Distribution in Multiuser OFDM Systems with Proportional Data Rate Requirement
A low complexity dynamic subcarrier and power allocation methodology for downlink communication in an OFDM-based multiuser environment is developed. The problem of maximizing overall capacity with constraints on total power consumption, bit error rate and data rate proportionality among users requiring different QOS specifications is formulated. Assuming perfect knowledge of the instantaneo...
متن کاملA Heuristic Optimal Discrete Bit Allocation Algorithm for Margin Maximization in DMT Systems
A heuristic optimal discrete bit allocation algorithm is proposed for solving the margin maximization problem in discrete multitone (DMT) systems. Starting from an initial equal power assignment bit distribution, the proposed algorithm employs a multistaged bit rate allocation scheme to meet the target rate. If the total bit rate is far from the target rate, a multiple-bits loading procedure is...
متن کاملQuality of Service and Dynamic Adaptive Discrete Multi-tone Modulation
In existing DMT (discrete multi-tone) systems with adaptive bit allocation a deterioration of the transmission channel may lead to increased bit error rates, and even to the loss of connection. In most cases this disturbed channel would allow a stable transmission using a new bit allocation (possibly with reduced data rate), after a further initialization phase. We propose dynamic adaptive DMT ...
متن کاملA Review of Bit Allocation for MCM Techniques in Power Line Communication for Smart Grids
In recent history there has been an enormous development in the subject area of Power Line Communications (PLC), since it has become possible due to advanced digital communications and digital signal processing techniques to use power lines for data transmission. PLC allows the use of the dynamic and far-reaching power cables to support high speed communication capabilities. Discrete Multi-tone...
متن کامل