Abstract
For 5G and beyond cellular communication systems, new coding and modulation techniques are suggested to reach the requirements of high data rate and quality of service. In this paper, a new space-time coded orthogonal transform division multiplexing (STC OTDM) technique is proposed for 5G applications. The proposed system is used to enhance the data rate and performance of the orthogonal transform division multiplexing (OTDM) technique. The proposed system is based on using space-time coding (STC) with OTDM to increase the system diversity and consequently the system performance. The OTDM technique is based on transmitting data on orthogonal basis functions obtained from the Singular Value Decomposition (SVD) of the channel impulse response of the desired user. Various modulation techniques like QPSK, 64-QAM, and 256-QAM are investigated using different subcarriers and channel models. The simulation results show that the proposed system achieved a better performance when compared to classical and recent multicarrier techniques. The proposed technique increases the diversity gain resulting in a decrease in the fading effect of the multipath channel and an enhancement in the bit error rate (BER) performance. The proposed technique also provides a secure data transmission to the desired user as his data is sent on the basis functions extracted from his own channel impulse response that cannot be decoded by other users.
Highlights
Wireless systems suffer from a rapid increasing demand for high data rates and quality of service
This paper focuses on the cellular communication system the proposed technique can be extended to different advanced wireless communication networks
An space-time coding (STC) orthogonal transform division multiplexing (OTDM) architecture is proposed for enhancing the performance of the bit error rate (BER) and An STC OTDM architecture is proposed for enhancing the performance of the BER and increasing increasing the diversity order
Summary
Wireless systems suffer from a rapid increasing demand for high data rates and quality of service. The modulated symbols are encoded using an Alamouti encoder for a 2 × 2 MIMO system and are transmitted over two consecutive symbol durations This technique improves diversity and reduces the BER as a result of increasing the signal to noise ratio (SNR), in addition to the advantages of the OTDM mentioned in [15]. This technique is promising for the future high performance and secure 5G systems when compared to the conventional.
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