Hierarchical Quadrature Amplitude Modulation for Image Transmission over Erroneous Wireless Channels
نویسندگان
چکیده
منابع مشابه
Hierarchical Quadrature Amplitude Modulation For Image Transmission Over Erroneous Wireless Channels
112106-6868 IJVIPNS-IJENS © December 2011 IJENS I J E N S Abstract—Bit dependency of image compression algorithms introduce error extension effects in transmission of compressed images and considerably reduce the received image quality. Channel coding provides protection against these errors but at the cost of increased bandwidth. Asymmetric modulation methods like QAM and QPSK provide alternat...
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The simplest type of digital modulation involves transmitting a sequence of waveforms (“symbols”) si(t) of equal durationT where eachwaveform is chosen independently from a set of M. This allows us to transmit up to b = log2(M) bits per symbol. A common sets of such symbols are those where the real and imaginary parts of the complex baseband signal are each modulated in amplitude. This known as...
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It is shown that a non-square (NS) 2-ary quadrature amplitude modulation (QAM) can be decomposed into a single-parity-check (SPC) block encoder and a memoryless modulator with independent in-phase (I) and quadrature (Q) symbol mapping. When NS-2-QAM is concatenated with a forward-errorcorrecting (FEC) code, iterative demodulation and decoding of the FEC code and the inherent SPC code of NS-2-QA...
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Convolutionally encoded M-ary quadrature amplitude modulation (M-QAM) systems operated over multidimensional channels, for example dual-polarized radio systems, are considered in this paper. We have derived upper bounds on the average bit-error probability for 4QAM (QPSK) with conventional convolutional coding by means of a truncated union bound technique and averaging over the cross-polarizati...
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Set Partitioning in Hierarchical Trees (SPIHT) is an efficient wavelet-based progressive image-compression technique, designed to minimize the mean-squared error (MSE) between the original and decoded imagery. Since wireless channels suffer from significant bit error rates, some mechanism to protect the encoded image is required. Many error control solutions have been proposed to address the pr...
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ژورنال
عنوان ژورنال: Energy Procedia
سال: 2011
ISSN: 1876-6102
DOI: 10.1016/j.egypro.2011.11.309