Elements of information theory
Elements of information theory
ADSL, VDSL, and Multicarrier Modulation: Wiley Series in Telecommunications and Signal Processing
ADSL, VDSL, and Multicarrier Modulation: Wiley Series in Telecommunications and Signal Processing
OFDM for Wireless Multimedia Communications
OFDM for Wireless Multimedia Communications
Introduction to Trellis-Coded Modulation with Applications
Introduction to Trellis-Coded Modulation with Applications
Ordered subcarrier selection algorithm for OFDM-based high-speed WLANs
IEEE Transactions on Wireless Communications
Optimal power loading for multiple-input single-output ofdm systems with bit-level interleaving
IEEE Transactions on Wireless Communications
Low complexity adaptive power and subcarrier allocation for OFDMA
IEEE Transactions on Wireless Communications
| Hi-index | 0.02 |
In this letter, we propose an extension to the ordered subcarrier selection algorithm (OSSA) for orthogonal frequency division multiplexing (OFDM) systems. The result is a simple algorithm for minimizing the bit error rate of the OFDM system at a fixed throughput. The proposed algorithm employs multiple modulations (non-uniform bit loading) within an OFDM symbol. However, unlike existing bit loading algorithms that have a very high computational complexity, the proposed algorithm is based only on the ordered statistics of the subcarrier gains and is consequently very simple. After ordering the subcarriers based on their gains, progressively higher order modulations are used with increasing gains. The key aspect here that greatly simplifies the algorithm is that the modulation used on a subcarrier depends only on the position of its gain in the ordered set and not on the actual values of the gains. We show an analytical approach for determining the parameters of the algorithm.