Data Transmission with Terahertz Communication Systems
139
domain equalization (FDE) and channel estimation technics [27]. The FDE might
be used to I and Q components in a similar way like in wire-line digital coherent
receiving schemes.
The 300 GHz carrier frequency can be generated using intermediate frequencies
of 16.460 GHz flowed by an amplifier and two tripler. The received IF signal with
lower IF frequency permits to generate a high output power as it is quite slight related
to the cutoff frequency of the device. Nevertheless, when the received IF signal has
low IF frequency, it is recommended to use high frequency multiplication ratio which
results in a higher conversion loss due to the difficulty in preserving circuit balance
over the whole bandwidth.
In Fig. 10, the performance of BPSK-MIMO is compared with QPSK-MIMO over
the proposed channel model. Over the region, 0 dB ≤ SNR ≤ 3 dB, the QPSK-MIMO
technique performs well than the BPSK-MIMO technique. However, at high SNR,
the BPSK-MIMO system is shown to outperform QPSK-MIMO system. Notice that
QPSK modulation provides more data transmission rate of the system than BPSK.
0
1
2
3
4
5
6
7
8
9
10
10
-6
10
-5
10
-4
10
-3
10
-2
10
-1
EbNo(dB)
BER
BPSK
QPSK
Fig. 10 BER of 2 * 2 MIMO-BPSK/QPSK system with a roll off of 0.2
139
domain equalization (FDE) and channel estimation technics [27]. The FDE might
be used to I and Q components in a similar way like in wire-line digital coherent
receiving schemes.
The 300 GHz carrier frequency can be generated using intermediate frequencies
of 16.460 GHz flowed by an amplifier and two tripler. The received IF signal with
lower IF frequency permits to generate a high output power as it is quite slight related
to the cutoff frequency of the device. Nevertheless, when the received IF signal has
low IF frequency, it is recommended to use high frequency multiplication ratio which
results in a higher conversion loss due to the difficulty in preserving circuit balance
over the whole bandwidth.
In Fig. 10, the performance of BPSK-MIMO is compared with QPSK-MIMO over
the proposed channel model. Over the region, 0 dB ≤ SNR ≤ 3 dB, the QPSK-MIMO
technique performs well than the BPSK-MIMO technique. However, at high SNR,
the BPSK-MIMO system is shown to outperform QPSK-MIMO system. Notice that
QPSK modulation provides more data transmission rate of the system than BPSK.
0
1
2
3
4
5
6
7
8
9
10
10
-6
10
-5
10
-4
10
-3
10
-2
10
-1
EbNo(dB)
BER
BPSK
QPSK
Fig. 10 BER of 2 * 2 MIMO-BPSK/QPSK system with a roll off of 0.2