Digital companding scheme using A I based custom constellation mapping and selection

Sastry, K. Seshadri; Babu, M. S. Prasad

doi:10.1109/icsess.2010.5552371

Cited by 1 publication

(1 citation statement)

References 2 publications

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“…In [15] efficient methods for high speed data transmission are proposed. In [16] AI based companding scheme to increase speed of OFDM system was proposed. In [17] SNR Mismatch and Online Estimation in Turbo Decoding were proposed.…”

Section: Introductionmentioning

confidence: 99%

Adaptive Modulation Using Neuro-Fuzzy (N-F) Controller for OFDM System

Sastry¹

2013

IJEEE

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As demand for high quality transmission increases, improving spectrum efficiency and error performance in wireless communication systems are important. OFDM is a multi-carrier modulation technique with densely spaced sub-carriers that has gained a lot of popularity among the broadband community in the last few years. One of the promising approaches to next generation communication systems are adaptive OFDM (AOFDM). Fixed modulation systems uses only one type of modulation scheme (or order), so that either performance or capacity should be compromised but in adaptive modulated systems change modulation scheme (or order) depending on instantaneous Signal to Noise Ratio (SNR) to attain superior performance and capacity compared to fixed modulated systems. Neuro-fuzzy controller combines advantages of fuzzy logic and neural networks. Neuro-fuzzy controller provides automatic adaption procedure to fuzzy logic controller. Neural networks requires sufficient prior knowledge to be initialized but neuro-fuzzy systems doesn't requires any prior knowledge to be initialized and is efficient compared to fuzzy logic and neural networks. In this paper we propose an adaptive modulated OFDM system using neuro-fuzzy controller. The proposed system is simulated in MATLAB and compared with existing systems, simulation results shown significant improvement in systems performance.

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Section: Introductionmentioning

confidence: 99%

Adaptive Modulation Using Neuro-Fuzzy (N-F) Controller for OFDM System

Sastry¹

2013

IJEEE

View full text Add to dashboard Cite

show abstract

Digital companding scheme using A I based custom constellation mapping and selection

Cited by 1 publication

References 2 publications

Adaptive Modulation Using Neuro-Fuzzy (N-F) Controller for OFDM System

Adaptive Modulation Using Neuro-Fuzzy (N-F) Controller for OFDM System

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