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首页> 外文期刊>International journal of electronics >Multimedia transmission in MC-CDMA using adaptive subcarrier power allocation and CFO compensation
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Multimedia transmission in MC-CDMA using adaptive subcarrier power allocation and CFO compensation

机译：使用自适应子载波功率分配和CFO补偿的MC-CDMA中的多媒体传输

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摘要

Multicarrier code division multiple access (MC-CDMA) system is one of the most effective techniques in fourth-generation (4G) wireless technology, due to its high data rate, high spectral efficiency and resistance to multipath fading. However, MC-CDMA systems are greatly deteriorated by carrier frequency offset (CFO) which is due to Doppler shift and oscillator instabilities. It leads to loss of orthogonality among the subcarriers and causes intercarrier interference (ICI). Water filling algorithm (WFA) is an efficient resource allocation algorithm to solve the power utilisation problems among the subcarriers in time-dispersive channels. The conventional WFA fails to consider the effect of CFO. To perform subcarrier power allocation with reduced CFO and to improve the capacity of MC-CDMA system, residual CFO compensated adaptive subcarrier power allocation algorithm is proposed in this paper. The proposed technique allocates power only to subcarriers with high channel to noise power ratio. The performance of the proposed method is evaluated using random binary data and image as source inputs. Simulation results depict that the bit error rate performance and ICI reduction capability of the proposed modified WFA offered superior performance in both power allocation and image compression for highquality multimedia transmission in the presence of CFO and imperfect channel state information conditions.
机译：多载波码分多址（MC-CDMA）系统是第四代（4G）无线技术中最有效的技术之一，因为它具有高数据速率，高频谱效率和抗多径衰落性能。但是，由于多普勒频移和振荡器的不稳定性，载波频率偏移（CFO）使MC-CDMA系统大大恶化。这导致子载波之间正交性的损失，并导致载波间干扰（ICI）。充水算法（WFA）是一种有效的资源分配算法，用于解决时间分散信道中子载波之间的功率利用问题。常规的WFA无法考虑CFO的影响。为了降低CFO进行子载波功率分配并提高MC-CDMA系统的容量，提出了残余CFO补偿的自适应子载波功率分配算法。所提出的技术仅将功率分配给具有高信道噪声功率比的子载波。使用随机二进制数据和图像作为源输入来评估该方法的性能。仿真结果表明，在存在CFO和不完善的信道状态信息条件的情况下，所提出的改进WFA的误码率性能和ICI降低能力在功率分配和图像压缩方面均提供了卓越的性能，可用于高质量多媒体传输。

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