Abstract
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. Keywords: Communication system; spreading code; chaotic code; massive MIMO-OFDM; bit error rate
Highlights
Multicarrier transmission techniques are regarded as the most promising candidates for the 4G communication systems
This paper proposes a spreading scheme based on chaos system for massive MIMO-OFDM system with K users and base station is equipped with N antennas, K < N
Numerical results based on the simulation outcomes of the proposed chaos based massive MIMO-OFDM to validate its effectiveness is presented
Summary
Multicarrier transmission techniques are regarded as the most promising candidates for the 4G communication systems. Among many multicarrier transmission schemes, OFDM is one of the leading schemes and is utilized in transmission systems such as DAB and DVB-T. To improve the data rate and throughput, a new technique by fusing MIMO and OFDM has been developed, named as MIMO-OFDM. MIMO-OFDM is the key technology to solve channel fading utilizing many antennas at the transmitter as well as receiver. The integration of MIMO and OFDM is a best way to satisfy the demand for high rate and reliable communication without increasing the bandwidth[1]. The rapid growth of communication technology and growing demand by the explosion of a greater number of users, the existing 4G systems are unable to fulfil the user requirements of high data rate demand.
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