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 | 3 × 3 | 1/2 | S 3 C in (6) | After 17.4 dB SNR level |
Alamouti's code comparison as shown in Figure 2. |
| 16-QAM | 3 × 3 | 1/2 | After 12 dB SNR level |
||
| QPSK | 3 × 3 | 1/2 | S 3 C in (6) and S 3 C 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 | 3 × 3 | 1/2 | After 2.4 dB SNR level with BER 10−4 as compared with code rate 3/4 |
||
| QPSK | 4 × 4 | 1/2 | S 4 C in (6) and S 4 C 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 | 4 × 4 | 1/2 | After 1.9 dB SNR level with BER 10−5 as compared with code rate 3/4 |
||
| QPSK | 4 × 4 | 1.3 | A′ and B′ in (44) | After 18.8 dB |
OSTBC comparison as shown in Figure 5. |
| 16-QAM | 4 × 4 | 1 | S 4 C 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 | 4 × 4 | 1.3 | A′ and B′ in (44) | After 11.4 dB SNR level before reaching the BER level of 10−2
|
|
| QPSK | 4 × 4 | 1.3 (8 Bps/Hz) | A′ and B′ in (44) | After 11.8 dB SNR level before reaching the BER of 10−2
|
OSTBC comparison as shown in Figure 7. |
| QPSK | 4 × 4 | 1.3 (9 Bps/Hz) | A′ and B′ in (44) | After 16.7 dB SNR level before reaching the BER level of 10−2
|
|
| QPSK | 4 × 4 | 2 | A′ and B′ in (45) | After 16.2 dB |
OSTBC comparison as shown in Figure 8. |
| 16-QAM | 4 × 4 | 2 | After 20.8 dB |
||
| QPSK | 4 × 4 | 1.5 | A′ and B′ 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 | 4 × 4 | 1.5 | After 18.9 dB SNR level before reaching the BER level of 10−3 |