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Performance analysis of wireless compressedimage transmission over DSTbased OFDMA systems
EURASIP Journal on Wireless Communications and Networking volume 2023, Article number: 76 (2023)
Abstract
Multimedia data, like images, consumes significant bandwidth when transmitted over wireless systems. Therefore, compressing transmitted images becomes crucial to reduce the required bandwidth and improve energy efficiency. This work aims to analyze the performance of transmitting wireless compressed images over a recent Discrete Sine Transform (DST)Based Orthogonal Frequency Division Multiple Access (DSTOFDMA) system. It investigates the effectiveness of several image compression methods by determining the minimum SignaltoNoise Ratio (SNR) required for each method to achieve errorfree image recovery at the receiver. This work considers different modulation schemes including 16QAM and QPSK, as well as different subcarrier mapping schemes (localized and interleaved) over vehicular A, SUI3, and uniform channels. Nine standard compression methods are used for analyzing the performance of the DSTOFDMA system and compared it with that of the conventional Discrete Fourier Transform (DFT)based OFDMA (DFTOFDMA) system. The results show that the performance of DSTOFDMA outperforms that of DFTOFDMA, especially when QPSK modulation is used. Simulation results demonstrate that the interleaved DSTOFDMA (DSTIOFDMA) system, employing the SPIHT_3D compression method and QPSK modulation (over the SUI3 channel model), achieves the lowest SNR value required for compressed image recovery, approximately 18 dB. This indicates that the SPIHT_3D compression method exhibits lower power consumption compared to other methods as well as high bandwidth efficiency.
1 Introduction
Orthogonal frequency division multiple access (OFDMA) system is one of the most common multiple access techniques used in the uplink of modern wireless communication standards due to its ability to support highspeed data transfer, lowlatency communication, and a large number of users [1]. It has been adopted as the standard for many wireless communication systems, including WiFi, longterm evolution (LTE) standard, and currently 5th generation standard. It can efficiently transmit many forms of multimedia communication of data compared to other existing traditional communication systems. Image transmission via wireless communication plays a crucial role in various everyday applications. It enables instantly sharing and receiving visual information across different devices and platforms. From social media platforms and messaging apps to video conferencing and remote surveillance systems, wireless image transmission enhances communication, facilitates remote collaborations, and enables realtime visual interactions [2]. OFDMA system has been widely used by various wireless image transmission standards. The image transmission performance over OFDMA was implemented and investigated with various basis functions in [3, 4]. But there are few works have been done in the transmission of compressed images over wireless communication systems.
Image compression and transmission over wireless communication systems is a complex and challenging task that requires careful consideration of various factors such as image quality, bandwidth, and transmission reliability. The compressedimage transmission over wireless communication systems has been studied by many researchers, for example, see [5,6,7,8,9,10,11,12]. In [13], the wireless transmission of the compressed image was evaluated over the OFDMA system with only discrete Fourier transform (DFT) as a basis function. On the other hand, the existing literature has not explored the wireless transmission of compressed images as an application over the OFDMA system using discrete sine transform (DST) as a basis function, which is the primary objective of this paper. This motivated us to do this research work and investigate the performance of wireless transmission of compressed images utilizing the DST in OFDMA systems. This paper aims to analyze the transmission of compressed images over DSTOFDMA for different compression methods, various subcarrier mapping schemes, including interleaved and localized subcarriers mapping, and different modulation schemes, such as QPSK and 16QAM, over SUI3, vehicular A, and uniform channels. Specifically, it aims to determine the compressed method that requires low power consumption by determining the minimum SNR necessary to achieve the accurate reconstruction of compressed images. Whereas in [14], the authors discussed the DSTOFDMA system to allow the application of efficient transmission of noncompressed data over wireless channels. DSTOFDMA is a communication system that combines DST and OFDMA in which the DST is used as a basis function, while OFDMA is used to divide the available bandwidth into multiple subcarriers, allowing multiple users to transmit simultaneously without interfering with each other. The use of DST enables efficient compression of data, while OFDMA enables multiple users to transmit their data simultaneously without interference [15]. This makes DSTOFDMA particularly useful for highspeed wireless communication applications, such as video streaming and realtime data transfer.
The contribution of this paper can be summarized as follows:

1.
This paper is the first one to study and analyze the performance of compressed image transmission over the DSTOFDMA system and compare the obtained results with that over the conventional DFTOFDMA system. Nine compression methods are evaluated over three different scenarios for different mapping systems: DFTinterleaved OFDMA (IOFDMA), DFTlocalized OFDMA (LOFDMA), DSTIOFDMA, and DSTLOFDMA.

a.
In the first scenario, 16QAM and QPSK modulations were used over the vehicular A channel model.

b.
In the second scenario, 16QAM and QPSK modulations were used over the SUI3 channel model.

c.
In the third scenario, 16QAM and QPSK modulations were used over the uniform channel model.

a.

2.
To assess the performance in each scenario, we will calculate the minimum required SNR for successfully recovering the transmitted compressed image. This comparison metric will help identify the system with lower power consumption in each scenario. The power consumption of the compression method with a low SNR will be lower compared to the compression method with a high SNR.

3.
Simulation results are performed using MATLAB to investigate and find the best compression method that requires a low power consumption to detect the compressed image without error at different scenarios by determining the required minimum SNR.
In future research, we can improve bandwidth utilization and make our systems more energy efficient. This can be done by combining different techniques such as reconfigurable intelligent surface (RIS) [16], ratesplitting multiple access (RSMA) [17], and energyefficient beamforming [18]. This paper focused on a singleinput singleoutput (SISO) scenario with a convolutional code and QPSK or 16QAM modulation, similar to 4G systems, at a frequency of 2 MHz. Expanding this research to include more advanced techniques such as 256 QAM modulation, LDPC code, and multipleinput multipleoutput (MIMO) systems operating in the millimeter wave frequency band, as seen in 5G networks, would be of interest. Additionally, incorporating hybrid precoding and combining techniques, as demonstrated in reference [19], could further enhance the study.
The rest of this paper is organized as follows. Section 2 introduces the DSTOFDMA system model. Section 3 discusses various image compression methods. Section 4 presents and discusses the simulation results for the DSTOFDMA system using several image compression methods. Finally, Sect. 5 draws conclusions based on the simulation results.
2 OFDMA system model
2.1 DSTOFDMA system
The OFDMA system is an extension of the OFDM system designed to support multiple users. In an OFDMA system, each user is assigned specific subcarriers during specific time for communication. To simplify the allocation process and minimize overhead, subcarriers are typically assigned in contiguous groups. However, a key challenge in OFDMA systems is synchronizing the uplink transmission to prevent interference between users. In this section, we explore the use of DST as the basis function in the OFDMA system, resulting in the DSTOFDMA system model. The DST offers several advantages over the DFT. Unlike the DFT, the DST utilizes only real arithmetic operations instead of complex arithmetic. This reduces the complexity of signal processing and minimizes inphase/quadrature imbalance issues.
Figure 1 illustrates the structure of the uplink DSTOFDMA system. The system consists of K users and one base station. A total of M subcarriers are available, and each user is allocated a subset of N subcarriers for their uplink transmission. It is assumed that all users have an equal number of subcarriers for simplicity. The transmitter in the OFDMA system utilizes two subcarrier mapping schemes, the interleaved and the localized.
At the transmitter side in Fig. 1, the received image is first compressed using one of the compression methods and then encoded using a convolutional code. Then, the encoded data is transformed into a multilevel sequence of complex numbers using various modulation formats such as QPS an 16QAM. These modulated symbols are then grouped into blocks, each containing N symbols, and subjected to either interleaved or localized subcarrier mapping techniques. Next, an Mpoint Inverse DST (IDST) process is applied. Finally, to facilitate frequency domain equalization at the receiver side and mitigate interblock interference, a cyclic prefix (CP) is added. The CP ensures that linear convolution is converted into circular convolution. Additionally, the CP helps remove interblock interference. After adding a CP to the resulting signal, the signal is transmitted through the wireless channel.
In matrix notation, the transmitted signal of the kth user (k = 1,2,….,K) can be formulated as follows:
where \({\mathbf{d}}^{k}\) is an N × 1 vector containing the modulated symbols of the kth user. \({{\varvec{S}}}_{M}^{1}\) represents an M × M IDST matrix. The matrix \({{\varvec{M}}}_{T}^{k}\) is an M × N matrix that describes the subcarriers mapping for the kth user. Here, M is equal to Q.N, where Q is the maximum number of users that can transmit, simultaneously. \({\mathbf{P}}_{add}\) represents an (M + N_{C}) × M matrix, which adds a CP of length N_{C}.
For the localized DFTOFDMA, the entries of \({{\varvec{M}}}_{T}^{k}\) IS given by [15]:
For the interleaved DFTOFDMA, the entries of \({{\varvec{M}}}_{T}^{k}\) IS given by [15]:
where the \({\mathbf{I}}{}_{N}\) and \({\mathbf{0}}{}_{{Q^{\prime} \times N}}\) matrices denote the N × N identity matrix, and the \(Q^{\prime} \times N\) allzero.
matrix, respectively. \({\mathbf{u}}_{l}\) (l = 1, 2, …, N) denotes the unit column vector, of length N, with all zero entries except at l. \({\mathbf{P}}_{add}\) can be represented as follows [15]:
where
At the receiver side, after removal the CP, the frequency domain equalization (FDE) is performed and then the DST, the subcarriers demapping, the demodulation and the decoding processes are applied. The received signal after removing the CP can be expressed as
where \({{\varvec{H}}}_{C}^{k}\) represents an M × M circulant matrix of the multipath channel between the base station and the kth user. \({\varvec{n}}\) is an M × 1 vector describes the additive noise. \({\mathbf{H}}_{C}^{u}\) is given by [15]:
The circulant matrix \({\mathbf{H}}_{C}^{u}\) can be written as:
where \({\mathbf{F}}_{{}}^{{}}\) and \({\mathbf{F}}_{{}}^{  1}\) are the M × M DFT and the M × M IDFT matrices, respectively. \({{\varvec{\Lambda}}}_{{}}^{u}\) is an M × M diagonal matrix containing the DFT of the circulant sequence of \({\mathbf{H}}_{C}^{u}\).
After substituting Eq. (8) into Eq. (6) and applying the DFT, we obtain:
where \({{\varvec{\Lambda}}}^{\mathrm{k}}\) is an M × M diagonal matrix that contains the DFT of the circulant sequence of the kth user. \(\mathbf{N}\) is the DFT of \({\varvec{n}}\). After that, the FDE can be performed using the minimum mean square error (MMSE) criteria. This is followed by the IDFT, DST, and subcarrier demapping processes to obtain the estimated modulated symbols, as described mathematically by Eq. (4).
where \({{{\varvec{W}}}_{MMSE}}^{k}\) is the M × M FDE matrix of the kth user based on the MMSE criteria, \({\mathbf{F}}_{M}^{1}\) is an M × M invers DFT matrix, \({\mathbf{S}}_{\mathrm{M}}\) is an M × M DST matrix, and \({\mathbf{M}}_{\mathrm{R}}^{\mathrm{k}}\) is the subcarrier demapping matrix of the kth user. \({{{\varvec{W}}}_{MMSE}}^{k}\) can be expressed as [15]
One major drawback of the MMSE equalizer is the requirement for estimation of the SNR at the receiver. This can be achieved by transmitting specifically chosen pilot sequences and subsequently measuring the SNR at the receiver.
Finally, the estimated modulated symbols undergo demodulation, decoding, and image decompression processes to obtain the original transmitted image.
2.2 Conventional DFTOFDMA system
The conventional DFTOFDMA and DSTOFDMA systems exhibit similar levels of complexity for their respective transmitter schemes. However, at the receiver end, which serves as the base station, the DSTOFDMA system incurs slightly greater complexity than the DFTOFDMA system. This is because the DSTOFDMA system still relies on the DFT and IDFT for the onetap frequency domain equalizer. Despite this increase in complexity, the benefits of the DSTOFDMA system make the elevated complexity in the uplink acceptable.
3 Image compression methods
Mostly, image compression methods are used to minimize the image data size while keeping the needed information to recover the compressed image effectively. Compression methods can be divided into two types. Lossless compression is a method of compression that does not result in any loss of information. This type of compression is used when it is important to maintain the quality of the original image, such as in medical imaging, legal images and graphic design applications. Lossless compression works by identifying and eliminating redundant data in the image file. Examples of lossless compression methods include PNG and GIF. Lossy compression, on the other hand, is a method of compression that results in a loss of some of the original image data. This type of compression is used when a high compression ratio is required, such as in webbased applications or digital photography. Lossy compression works by identifying and removing nonessential data from the image file, such as highfrequency noise or color information that is not perceptible to the human eye. Image compression methods are an important part of modern digital communication and media technologies, allowing for efficient storage and transmission of large amounts of image data. However, it is important to choose the appropriate compression method depending on the specific application and requirements for image quality and file size.
Nine compression methods were taken from the Wavelet Toolbox of MATLAB and used to analyze the performance of compressedimage transmission over DSTOFDMA, see Table 1.
Compression methods aim to improve bandwidth efficiency by reducing the amount of data required for transmission or storage. Techniques like SPIHT, SPIHT3D, and EZW have shown high compression efficiency, making them popular for bandwidthlimited applications. However, the effectiveness of a method depends on the data characteristics. Evaluating and comparing different methods is crucial to determine the most suitable and bandwidthefficient option for specific applications. Among the compression methods in Table 1, SPIHT and SPIHT3D are wellknown for their high compression efficiency. They utilize a progressive encoding approach that prioritizes significant coefficients, resulting in high compression ratios.
4 Simulation results and discussion
The simulation results are carried out using MATLAB 2020 to compute and compare the minimum required SNR value to recover the transmitted compressed image over DFTLOFDMA, DFTIOFDMA, DSTLOFDMA, and DSTIOFDMA systems. Different compression methods, modulation schemes, and subcarrier mapping schemes are used over vehicular A, SUI3 and Uniform channel models. Three scenarios are considered. The experimental steps are depicted in Fig. 2. The wpeppers.jpg image of MATLAB 2020 is used and shown in Fig. 3. The parameters of OFDMA system are tabulated in Table 2.
4.1 The first scenario
In this scenario, the compressed image is transmitted via DFTLOFDMA, DFTIOFDMA, DSTLOFDMA and DSTIOFDMA with QPSK and 16QAM modulations over vehicular A channel. The minimum SNR values for recovering the received compressed image using different compression methods are listed in Table 3 and plotted in Fig. 4.
As shown in Table 3 and Fig. 4, the minimum SNR is about 21 dB which has been achieved by DSTIOFDMA, when the QPSK modulation scheme and SPIHT_3D compression method are used. Moreover, it is generally observed that the DSTOFDMA system has better performance than DFTOFDMA when QPSK modulation is used.
4.2 The second scenario
In this scenario, the compressed image is transmitted over the SUI3 channel model for DSTLOFDMA, DSTIOFDMA, DFTLOFDMA and DFTIOFDMA with QPSK and 16QAM modulations. the required minimum SNR values to recover the transmitted compressed image for the nine compression methods are shown in Fig. 5 and listed in Table 4. It is observed that the minimum SNR is 18 dB which was obtained by DSTIOFDMA with SPIHT_3D compression method. Generally, DSTOFDMA has better performance as compared with DFTOFDMA system especially with QPSK modulation approach.
4.3 The third scenario
The third scenario describes the required minimum SNR to recover the transmitted compressed image for DSTLOFDMA, DSTIOFDMA, DFTLOFDMA and DFTIOFDMA when Uniform channel is used with QPSK and 16QAM modulation approaches. The obtained results are shown in Table 5 and Fig. 6. It is noted that the smallest SNR is 20 dB. This value has been obtained by the DSTIOFDMA system when the QPSK modulation approach and SPIHT and STW compression methods are used.
For more clarification, we can compare all the scenarios for all channels based on the type of the modulation schemes as follows. Firstly, as shown in Fig. 7 and Table 6, we compare the SNR values of DSTLOFDMA, DSTIOFDMA, DFTLOFDMA, and DFTIOFDMA systems when employing the QPSK modulation scheme. This comparison is performed across the nine compression methods over vehicular A, SUI3, and Uniform channels. Figure 7 and Table 6 show that the smallest SNR is 18 dB which was achieved by DSTIOFDMA system for SPIHT_3D compression method.
Secondly, Fig. 8 and Table 7 present a comparison of the SNR values for DSTLOFDMA, DSTIOFDMA, DFTLOFDMA, and DFTIOFDMA systems when utilizing the 16QAM modulation scheme. This evaluation encompasses the nine compression methods across vehicular A, SUI3, and Uniform channels. Figure 8 and Table 7 show that the smallest SNR is 27 dB which was achieved by DSTIOFDMA system for SPIHT compression method.
Lastly, Table 8 shows the minimum required SNR for each compression method with the suitable systems. It is concluded that the appropriate system for compressedimage transmission is DSTOFDMA with QPSK modulation and SUI3 channel model as compared with DFTOFDMA.
5 Conclusion
In this paper, the transmitted compressed image via the DSTOFDMA system has been analyzed and compared with the DFTOFDMA system using several compression methods when different channel models, different modulation schemes, and different subcarrier mapping schemes were used. The minimum required SNR to recover the compressed image was computed for three scenarios as follows. In the first scenario, the transmission of a compressed image over DSTIOFDMA, DSTLOFDMA, DFTIOFDMA and DFTLOFDMA systems were studied when vehicular A channel, QPSK and 16QAM modulation schemes were used. In the second and the third scenarios, the same evaluation was applied but over SUI3 and Uniform channel models, respectively. The simulation results were carried out using MATLAB 2020 and shown that the smallest value of SNR was 18 dB to recover the compressed transmitted image. This value was obtained when the DSTIOFDMA system was used with the SPIHT_3D compression method and QPSK modulation over the SUI3 channel model. This indicated that SPIHT_3D has lower power consumption as compared with other compression methods in addition to its high bandwidth efficiency. Furthermore, the obtained results have shown that the performance of DSTOFDMA is better than DFTOFDMA, especially when QPSK modulation was used over the SUI3 channel model. For future work, it would be interesting to study impact of the carrier frequency offsets as well as the imperfect channel estimation on the transmission of compressed image over DFTOFDMA and DSTOFDMA. Moreover, it is also interesting to expand this research to include more advanced modulation and coding systems for MIMO system, operating in the millimeter wave frequency band like 5G networks.
Availability of data materials
The data in this study are available from the corresponding author upon request.
Abbreviations
 DST:

Discrete Sine transform
 DFT:

Discrete Fourier transform
 LOFDMA:

Localized OFDMA
 IDST:

Inverse DST
 IOFDMA:

Interleaved OFDMA
 SPIHT:

Set partitioning in hierarchical trees
 STW:

Spatialorientation tree wavelet
 SPIHT3D:

Set partitioning in hierarchical trees 3D for true color images
 EZW:

Embedded Zerotree Wavelet
 WDR:

Wavelet difference Reduction
 ASWDR:

Adaptively scanned wavelet difference reduction
 lvl_mmc:

Subband thresholding of coefficients and Huffman encoding
 GBL_MMC_F:

Global thresholding of coefficients and fixed encoding
 GBL_MMC_H:

Global thresholding of coefficients and Huffman encoding
 SNR:

Signaltonoise ratio
 MSE:

Mean square error
 PSNR:

Peak signaltonoise ratio
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N.H and K.A.M. contributed to writing—original draft, data curation, visualization, analyzing the collected articles. M.A.S.contributed to conceptualization, supervision, project administration, review. F.S. helped in writing, editing, review. All the authors contributed to the general discussion and revision of the manuscript.
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AlAshwal, N.H., Al Soufy, K.A.M., AlKamali, F.S. et al. Performance analysis of wireless compressedimage transmission over DSTbased OFDMA systems. J Wireless Com Network 2023, 76 (2023). https://doi.org/10.1186/s13638023022869
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DOI: https://doi.org/10.1186/s13638023022869