Data Transmission with Terahertz
Communication Systems
Mohammed El Ghzaoui and Sudipta Das
Abstract The need for high bandwidth in wireless systems has been increased
because there is always unoccupied bandwidth for the current communication system. Therefore, the extension of communication systems to higher frequencies is
required to offer high-capacity wireless applications. In order to achieve high capacity, the carrier frequencies requisite should be increased more than 100 GHz. Nowadays, academics are currently working on wireless communication systems at terahertz (THz) frequency which is attractive for wireless communications since they
lead to high capacity. However, the THz channel is a harsh environment for signal
transmission. So, the implementation of THz communication system requires the
study of modulation schemes. Among various kinds of communication techniques,
QPSK and BPSK are suitable due to their simplicity. In this work, quadrature phase
shift keying (QPSK) and binary phase shift keying (BPSK) are assumed with incoherent and coherent receiver, respectively. When it comes to opting for the appropriate
modulation techniques for THz communication system, there is always a compromise to be made between bandwidth efficiency and power efficiency. For that reason, the performance modulation schemes were analyzed in terms of data rate and
power efficiency. Besides, multiple-input multiple-output (MIMO) can provide high
capacity by using multiple transmit or receive antennas. This chapter evaluates the
performance of QPSK/BPSK modulations for single-input single-output (SISO) and
MIMO technics under different values of the roll-off factor considered for root raised
cosine (RCC) filter; then we analyze the performance of MRC receiver in MIMO
wireless channels with Alamouti encoding at THz frequencies.
Keywords THz communication system · Wireless channel · MIMO · Alamouti
encoding · QAM · ASK · PSK · ISI · BER · SNR · MRC
M. El Ghzaoui
ENS-UMI, Moulay Ismail University of Meknes, Toulal, ENS, BP.3104, Meknes, Morocco
S. Das (B)
Department of Electronics & Communication Engineering, IMPS College of Engineering &
Technology, Chandipur, WB, India
e-mail: sudipta.das1985@gmail.com
© Springer Nature Singapore Pte Ltd. 2020
A. Biswas et al. (eds.), Emerging Trends in Terahertz Solid-State Physics and Devices,
https://doi.org/10.1007/978-981-15-3235-1_9
121
Communication Systems
Mohammed El Ghzaoui and Sudipta Das
Abstract The need for high bandwidth in wireless systems has been increased
because there is always unoccupied bandwidth for the current communication system. Therefore, the extension of communication systems to higher frequencies is
required to offer high-capacity wireless applications. In order to achieve high capacity, the carrier frequencies requisite should be increased more than 100 GHz. Nowadays, academics are currently working on wireless communication systems at terahertz (THz) frequency which is attractive for wireless communications since they
lead to high capacity. However, the THz channel is a harsh environment for signal
transmission. So, the implementation of THz communication system requires the
study of modulation schemes. Among various kinds of communication techniques,
QPSK and BPSK are suitable due to their simplicity. In this work, quadrature phase
shift keying (QPSK) and binary phase shift keying (BPSK) are assumed with incoherent and coherent receiver, respectively. When it comes to opting for the appropriate
modulation techniques for THz communication system, there is always a compromise to be made between bandwidth efficiency and power efficiency. For that reason, the performance modulation schemes were analyzed in terms of data rate and
power efficiency. Besides, multiple-input multiple-output (MIMO) can provide high
capacity by using multiple transmit or receive antennas. This chapter evaluates the
performance of QPSK/BPSK modulations for single-input single-output (SISO) and
MIMO technics under different values of the roll-off factor considered for root raised
cosine (RCC) filter; then we analyze the performance of MRC receiver in MIMO
wireless channels with Alamouti encoding at THz frequencies.
Keywords THz communication system · Wireless channel · MIMO · Alamouti
encoding · QAM · ASK · PSK · ISI · BER · SNR · MRC
M. El Ghzaoui
ENS-UMI, Moulay Ismail University of Meknes, Toulal, ENS, BP.3104, Meknes, Morocco
S. Das (B)
Department of Electronics & Communication Engineering, IMPS College of Engineering &
Technology, Chandipur, WB, India
e-mail: sudipta.das1985@gmail.com
© Springer Nature Singapore Pte Ltd. 2020
A. Biswas et al. (eds.), Emerging Trends in Terahertz Solid-State Physics and Devices,
https://doi.org/10.1007/978-981-15-3235-1_9
121