Research Article
Performance Analysis of MIMO-STBC Systems with Higher Coding Rate Using Adaptive Semiblind Channel Estimation Scheme
Table 2
Comparison result analysis of different STBCs for different transmitting antennas with their code rates.
| | Modulation used | Antenna configuration | Code rate | STBC used | APASBCE based semiblind CE improvement | Remarks |
| | QPSK | | 1/2 | in (6) | After 17.4 dB SNR level
| Alamouti’s code comparison as shown in Figure 2. | | 16-QAM | | 1/2 | After 12 dB SNR level
| | QPSK | | 1/2 | in (6) and in (7) | After 3.2 dB SNR level with BER 10−4 as compared with code rate 3/4
| OSTBC comparison as shown in Figure 3. | | 16-QAM | | 1/2 | After 2.4 dB SNR level with BER 10−4 as compared with code rate 3/4
| | QPSK | | 1/2 | in (6) and in (8) | After 1.6 dB SNR level with BER 10−5 as compared with code rate 3/4
| OSTBC comparison as shown in Figure 4. | | 16-QAM | | 1/2 | After 1.9 dB SNR level with BER 10−5 as compared with code rate 3/4
| | QPSK | | 1.3 | and in (44) | After 18.8 dB
| OSTBC comparison as shown in Figure 5. | | 16-QAM | | 1 | in (9) | After 14.2 dB SNR level before reaching the BER level of 10−2
| QOSTBC and OSTBC comparison as shown in Figure 6. | | QPSK | | 1.3 | and in (44) | After 11.4 dB SNR level before reaching the BER level of 10−2
| | QPSK | | 1.3 (8 Bps/Hz) | and in (44) | After 11.8 dB SNR level before reaching the BER of 10−2
| OSTBC comparison as shown in Figure 7. | | QPSK | | 1.3 (9 Bps/Hz) | and in (44) | After 16.7 dB SNR level before reaching the BER level of 10−2
| | QPSK | | 2 | and in (45) | After 16.2 dB
| OSTBC comparison as shown in Figure 8. | | 16-QAM | | 2 | After 20.8 dB
| | QPSK | | 1.5 | and in (47) | After 11.8 dB SNR level before reaching the BER level of 10−3
| OSTBC comparison as shown in Figure 9. | | 16-QAM | | 1.5 | After 18.9 dB SNR level before reaching the BER level of 10−3 |
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