Performance Analysis of Image Transmission with Different Transforms in MC-CDMA

D. Judson, DARWIN. P, T. A. MARIA DEVI, Chachu N Helen
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引用次数: 4

Abstract

In the field of communication, multimedia transmission is very important. Transmission of high quality images through wireless channel have always been challenging. This is due to the reserved bandwidth and capacity. So instead of conventional method of transmitting image with one carrier, the image signal is divided into subsets and different sub band carrier modulates each subset. So the main objective is to transmit an image in a multicarrier modulation system with good quality in a hostile radio channel. Multi carrier Code Division Multiple Access (MC-CDMA) is a multiple access scheme which combines both the benefits of orthogonal frequency division multiplexing (OFDM) and code division multiple access (CDMA). In the proposed MC-CDMA system, Discrete Cosine Transform (DCT) is used instead of Discrete Fourier Transform (DFT) because of its spectral energy compaction property. Further to overcome the peak to average power ratio (PAPR) problem, trigonometric transforms based OFDM are used in MC-CDMA system. The effects of multi access interference (MAI) can be counteracted by frequency domain equalization (FDE). The performance of the proposed system is evaluated using Mean Square Error (MSE) and Peak Signal to Noise Ratio (PSNR) criterion.
MC-CDMA中不同变换图像传输性能分析
在通信领域,多媒体传输是非常重要的。通过无线信道传输高质量图像一直是一个挑战。这是由于预留的带宽和容量。这样就代替了传统的单载波传输图像的方法,将图像信号分成多个子集,由不同的子载波调制每个子集。因此,主要目标是在多载波调制系统中在敌对无线电信道中以高质量传输图像。多载波码分多址(MC-CDMA)是一种集正交频分复用(OFDM)和码分多址(CDMA)优点于一体的多址方案。在MC-CDMA系统中,采用离散余弦变换(DCT)代替离散傅立叶变换(DFT),以提高其频谱能量压缩特性。为了进一步克服峰值平均功率比(PAPR)问题,在MC-CDMA系统中采用了基于三角变换的OFDM。多址干扰(MAI)的影响可以通过频域均衡(FDE)来抵消。采用均方误差(MSE)和峰值信噪比(PSNR)准则对系统性能进行了评价。
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