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首页> 外文期刊>Indian Journal of Science and Technology >Performance evaluation of chaotic spreading codes in massive MIMO OFDM system
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Performance evaluation of chaotic spreading codes in massive MIMO OFDM system

机译：大规模MIMO系统中混沌扩散码的性能评价

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Background/Objectives: Wireless communication systems are growing towards the implementation of 5G communication systems to satisfy the demand of services in future. OFDMA has some shortcoming like one or more subcarriers of OFDM are completely affected due to the characteristic of the transmission channel. Spreading scheme has been introduced to combat the aforementioned issue. Furthermore, communication channels are affected by multipath fading which changes the amplitude of the received signal. This fading severely affects the communication systems. Therefore, it is essential to develop a more robust technique for higher data transmission and larger throughput. The main objective of this study is to design a massive MIMOOFDM system for secure transmission of data. Chaos based sequence is used to spread the data before transmission which will solve intercell interference and improve the security of data. Methods: This study presents a chaos based massive MIMO-OFDM communication system. The proposed chaos based massive MIMO-OFDM system is implemented and its efficacy is evaluated by computing bit error rate. The effectiveness of the proposed system is investigated by varying the parameters including modulation methods such as PSK and QAM, number of users 10, 20 and 30 and spreading factor of 5, 10 and 15. Findings: Results clearly proved that the proposed system provides exceptional performance with 16QAM modulation scheme, 10 users at high spreading factor value of 15. Novelty: The uniqueness of the proposed system is with enhanced performance and usage of novel modulation scheme by varying the spreading factor value, when compared to its peers.
机译：背景/目标：无线通信系统朝着实现5G通信系统的实现，以满足未来服务的需求。 OFDMA具有一些缺点，如OFDM的一个或多个子载波由于传输通道的特征而完全受到影响。已经引入了传播方案来打击上述问题。此外，通信信道受到多径衰落的影响，多径衰落改变接收信号的幅度。这一衰落严重影响通信系统。因此，必须为更高的数据传输和更大的吞吐量开发更强大的技术。本研究的主要目的是设计一种用于安全传输数据的大规模模糊系统。基于混沌的序列用于在传输之前传播数据，这将解决Intercell干扰并提高数据的安全性。方法：本研究提出了基于混沌的大规模MIMO-OFDM通信系统。所提出的基于混沌的大规模MIMO-OFDM系统得到实现，并且通过计算误码率来评估其功效。通过改变包括调制方法的参数来研究所提出的系统的有效性，例如PSK和QAM，用户10,20和30的数量，以及5,10和15的扩散因子。结果：结果清楚地证明了所提出的系统提供了特殊的具有16QAM调制方案的性能，10个用户处于高扩散因子值15.新颖性：当与对等体相比，所提出的系统的唯一性具有增强的性能和使用新型调制方案的性能和使用。

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