Adaptive Modulation for OFDM-Based Multiple Description Progressive Image Transmission

Tan, Sheu-Sheu; Cosman, Pamela C.; Milstein, L.B.

doi:10.1109/glocom.2008.ecp.620

Cited by 19 publications

(24 citation statements)

References 9 publications

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“…In particular, in Fig. 5, we show the optimal allocation of source and channel symbols for imperfect CSI systems with different frequency diversity orders ( 1,4,32,128) in an environment with . The time domain channel code rate is fixed at 8/24.…”

Section: Resultsmentioning

confidence: 99%

“…We used QPSK modulation and considered both perfect and imperfect CSI. It should be noted that more sophisticated modulation schemes could be used to further improve the system performance, such as the one discussed in [32]. However, for the sake of simplicity and better understanding of the fundamental impact of the time and frequency diversities on the construction of the 2-D OFDM block, a fixed modulation scheme using QPSK was chosen.…”

Section: Resultsmentioning

confidence: 99%

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Channel Coding for Progressive Images in a 2-D Time-Frequency OFDM Block With Channel Estimation Errors

Toni

Chan

Cosman

et al. 2009

IEEE Trans. on Image Process.

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Abstract-Coding and diversity are very effective techniques for improving transmission reliability in a mobile wireless environment. The use of diversity is particularly important for multimedia communications over fading channels. In this work, we study the transmission of progressive image bitstreams using channel coding in a 2-D time-frequency resource block in an OFDM network, employing time and frequency diversities simultaneously. In particular, in the frequency domain, based on the order of diversity and the correlation of individual subcarriers, we construct symmetric -channel FEC-based multiple descriptions using channel erasure codes combined with embedded image coding. In the time domain, a concatenation of RCPC codes and CRC codes is employed to protect individual descriptions. We consider the physical channel conditions arising from various coherence bandwidths and coherence times, leading to a range of orders of diversities available in the time and frequency domains. We investigate the effects of different error patterns on the delivered image quality due to various fade rates. We also study the tradeoffs and compare the relative effectiveness associated with the use of erasure codes in the frequency domain and convolutional codes in the time domain under different physical environments. Both the effects of intercarrier interference and channel estimation errors are included in our study. Specifically, the effects of channel estimation errors, frequency selectivity and the rate of the channel variations are taken into consideration for the construction of the 2-D time-frequency block. We provide results showing the gain that the proposed model achieves compared to a system without temporal coding. In one example, for a system experiencing flat fading, low Doppler, and imperfect CSI, we find that the increase in PSNR compared to a system without time diversity is as much as 9.4 dB.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Channel Coding for Progressive Images in a 2-D Time-Frequency OFDM Block With Channel Estimation Errors

Toni

Chan

Cosman

et al. 2009

IEEE Trans. on Image Process.

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“…Five 4-QAM, 16-QAM and 64-QAM modulated symbols are grouped as one, two, and three RS code symbols, respectively. Details about the mapping from modulated symbols to RS code symbols can be found in [8].…”

Section: B System Modelmentioning

confidence: 99%

“…Particularly for image or video transmission, throughput maximization has been used as an alternative to distortion minimization [7,8] due to its simplicity. When instantaneous channel quality information is perfectly known, throughput maximization is close to distortion minimization.…”

Section: Introductionmentioning

confidence: 99%

Variance-Aware Adaptive Modulation for OFDM-Based Multiple Description Progressive Image Transmission

Tan

Cosman

Milstein

2010

2010 IEEE International Conference on Communications

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Average throughput maximization has commonly been used as an alternative to image or video average distortion minimization. However, as the throughput-distortion curve is non-linear, throughput maximization can be very different from distortion minimization if the variance of the throughput is large. Under high channel quality variability, the variance of the throughput will be high. Multiple description coding with unequal error protection is a promising technique for the transmission of progressive images when there exists a high variability of the channel conditions. In this paper, we consider both the variance and the average of the throughput when deciding the constellation size for adaptive modulation in an OFDM system used for transmitting progressively-coded images with multiple description coding. Simulation results show that in an adaptive modulated image transmission system, taking into account both moments of the throughput achieves better performance than a system considering average throughput alone.

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“…There are various researchers that have used OFDM for image transmission e.g. Fatima [37], Shayegannia et al [38], Sheikh et al [39], Sharma et al [40], Sharma et al [41], Wang et al [42], Salah [43], Tan et al [44]. The prime reason behind the adoption of OFDM for image transmission is its capability to mitigate interference cause due to symbols and frequency.…”

Section: Channel-based Approachesmentioning

confidence: 99%

Insights on Error-Resilient Image Transmission Schemes on Wireless Network

Gururaj¹,

Sadashivappa²

2017

ijacsa

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Abstract-Usage of image as data (or signal) is quite frequent in majority of the user-centric application. However, transmission of image over non-concrete communication medium like air is still vulnerable due to inherent weakness of wireless communication e.g. interference, noise, scattering, fading, security etc. Wireless image transmission has yet unsolved problems when it comes to error resiliency. In this paper, we have reviewed the significant research contribution published in last 5 years associated with wireless image transmission, channel coding mechanism, and investigated the scale of effectiveness in the techniques based on advantages and limitations. We also extracted a significant research gap, which requires immediate attention. Hence, we propose our future direction of work with an indicative architectural design in order to address the problems identified in research gap from existing literatures. This paper is meant to brief about the existing system and practical approaches to solve such problems.

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Adaptive Modulation for OFDM-Based Multiple Description Progressive Image Transmission

Cited by 19 publications

References 9 publications

Channel Coding for Progressive Images in a 2-D Time-Frequency OFDM Block With Channel Estimation Errors

Channel Coding for Progressive Images in a 2-D Time-Frequency OFDM Block With Channel Estimation Errors

Variance-Aware Adaptive Modulation for OFDM-Based Multiple Description Progressive Image Transmission

Insights on Error-Resilient Image Transmission Schemes on Wireless Network

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