Abstract
The aim of this work is to perform an analytic comparison between adaptive modulation (AdM) and adaptive Forward Error Correction (AdFEC) in wireless network telecommunication systems. Through the Gilbert-Elliott model’s, the Packet Error Rate (PER) is calculated and both the throughput and the delay, for different modulations and error correction capacity, have been also investigated. For the throughput criterion adopted, the results show that the AdFEC performs better than AdM for higher values of Signal Noise-to-Ratio (SNR). However, when the SNR has low value the adaptive modulation performs better. For the delay criterion, the time to transmit a packet using AdM is lower than the time to transmit the same packet using AdFEC.
Highlights
The rapid growth in the use of information networks, increasing the data rates, led to the necessity to implement novel technique aiming to improve wireless networks communication performance
In a wireless communication system with a Rayleigh fading channel, errors tend to occur in bursts instead of random errors that occur in an Additive White Gaussian Noise (AWGN) channel [15]- [17]
The throughput of the adaptive Forward Error Correction (AdFEC) technique is better for high Signal Noise-toRatio (SNR) values, because there is no necessity to increment the parity bits in such case, instead, it is reduced since the errors are low
Summary
The rapid growth in the use of information networks, increasing the data rates, led to the necessity to implement novel technique aiming to improve wireless networks communication performance. Correction (AdFEC) operating together, have been developed to face fading and enhance the wireless systems performance They maximize bandwidth efficiency through selecting an optimal combination from the modulation and coding scheme (MCS), where the resolution depends on the channel state information. Several papers have approached AMC techniques in wireless networks under fading channels without considering the relationship between adaptive modulation and adaptive code [6,7,8]. In [12], the authors have deployed a combined modulation and FEC adaptive scheme to wireless multi-access Asynchronous Transfer Mode (ATM) networks He has considered additive white Gaussian noise (AWGN) channel, which does not accurately describe the real condition of the channel.
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