Title :
Image Transmission using Variable M-QAM with Optimized Bit Power Allocation
Author :
Sediq, Akram Bin ; El-Tarhuni, Mohamed ; Hassan, Mohamed
Author_Institution :
American Univ. of Sharjah, Sharjah
Abstract :
In this paper, optimization of minimum mean square error for image transmission using a variable M-QAM system is proposed for improving both power and bandwidth efficiencies. Optimization is based on bit power allocation according to the importance of bits to the overall image quality. An iterative off-line algorithm is presented to find the optimum power allocated and modulation level to different bits. Our results show that a 16-QAM system using the proposed algorithm with optimized bit power allocation provides an improvement in power efficiency as measured by the average Eb/No of about 2 dB over that using a conventional 16-QAM. However, the improvement increases significantly with the variable M-QAM system to about 6 dB while improving the bandwidth efficiency by about 17% over the conventional 16- QAM system.
Keywords :
bandwidth allocation; iterative methods; least mean squares methods; quadrature amplitude modulation; visual communication; bandwidth efficiency; bit power allocation optimization; image quality; image transmission; iterative off-line algorithm; minimum mean square error; variable M-QAM; Amplitude modulation; Bandwidth; Binary phase shift keying; Image communication; Image quality; Iterative algorithms; Land mobile radio; Mean square error methods; Power measurement; Streaming media; Adaptive Modulation; Image Transmission; MMSE; Power Allocation;
Conference_Titel :
Wireless Communication Systems, 2006. ISWCS '06. 3rd International Symposium on
Conference_Location :
Valencia
Print_ISBN :
978-1-4244-0398-1
Electronic_ISBN :
978-1-4244-0398-1
DOI :
10.1109/ISWCS.2006.4362252
