A Jointly Optimized Variable M-QAM and Power Allocation Scheme for Image Transmission
Joint Authors
Bin Sediq, Akram
El-Tarhuni, Mohamed
Hassan, Mohamed
Source
Journal of Computer Networks and Communications
Issue
Vol. 2012, Issue 2012 (31 Dec. 2012), pp.1-14, 14 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2012-02-29
Country of Publication
Egypt
No. of Pages
14
Main Subjects
Information Technology and Computer Science
Abstract EN
We introduce an improved image transmission scheme over wireless channels with flat Rayleigh fading.
The proposed scheme jointly optimizes bit power and modulation level to maximize the peak signal-to-noise ratio (PSNR) of the reconstructed image and hence improves the perceptual quality of the received image.
In this optimization process, the significance of bits with regard to the overall quality of the image is exploited.
The optimality of the proposed algorithm is demonstrated using the Lagrange method and verified through an iterative offline exhaustive search algorithm.
For practical implementation, a look-up table is used at the transmitter for assigning the bit power and modulation level to each bit stream according to the received signal-to-noise ratio (SNR) observed at the receiver.
The proposed scheme has low complexity since the look-up table is computed offline, only once, and used for any image which makes it suitable for devices with limited processing capability.
Analytical and simulation results show that the proposed scheme with jointly optimized bit power and variable modulation level provides an improvement in PSNR of about 10 to 20 dB over fixed power fixed modulation (16-QAM).
A further reduction in complexity is achieved by using the average signal-to-noise ratio rather than the instantaneous SNR in selecting the system parameters.
American Psychological Association (APA)
El-Tarhuni, Mohamed& Hassan, Mohamed& Bin Sediq, Akram. 2012. A Jointly Optimized Variable M-QAM and Power Allocation Scheme for Image Transmission. Journal of Computer Networks and Communications،Vol. 2012, no. 2012, pp.1-14.
https://search.emarefa.net/detail/BIM-487614
Modern Language Association (MLA)
El-Tarhuni, Mohamed…[et al.]. A Jointly Optimized Variable M-QAM and Power Allocation Scheme for Image Transmission. Journal of Computer Networks and Communications No. 2012 (2012), pp.1-14.
https://search.emarefa.net/detail/BIM-487614
American Medical Association (AMA)
El-Tarhuni, Mohamed& Hassan, Mohamed& Bin Sediq, Akram. A Jointly Optimized Variable M-QAM and Power Allocation Scheme for Image Transmission. Journal of Computer Networks and Communications. 2012. Vol. 2012, no. 2012, pp.1-14.
https://search.emarefa.net/detail/BIM-487614
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-487614