1 Introduction
2 OFDMA system model
2.1 DST-OFDMA system
2.2 Conventional DFT-OFDMA system
3 Image compression methods
No. | Compression method | MSE | PSNR |
---|---|---|---|
1 | 79.09 | 29.15 | |
2 | Spatial-orientation Tree Wavelet (STW): [20] | 47.534 | 31.361 |
3 | Set Partitioning In Hierarchical Trees 3D for true color images (SPIHT-3D) [22] | 57.1024 | 30.5643 |
4 | Embedded Zerotree Wavelet (EZW) [23] | 31.613 | 33.132 |
5 | wavelet difference Reduction (WDR) [24] | 24.471 | 34.244 |
6 | 22.2029 | 34.6667 | |
7 | Subband thresholding of coefficients and Huffman encoding (lvl_mmc) | 14.638 | 36.476 |
8 | 49.4474 | 31.1894 | |
9 | 49.4801 | 31.1865 |
4 Simulation results and discussion
Parameter | Specification |
---|---|
Simulation method | Monte Carlo |
The total number of subcarriers | M = 256 |
Number of users | 4 |
Modulation Type | QPSK and 16QAM |
The channel model used | Vehicular A channel, SUI3, Uniform channel |
the channel code | Convolutional code with rate ½ |
Subcarriers mapping mode | Interleaved and Localized |
Cyclic prefix length | 20 samples |
Channel estimation | Perfect |
System bandwidth | 5 MHz |
Equalization | MMSE |
4.1 The first scenario
Method no. | Compression Method | Vehicular A channel | |||||||
---|---|---|---|---|---|---|---|---|---|
DFT-LOFDMA | DFT-IOFDMA | DST-LOFDMA | DST-IOFDMA | ||||||
QPSK | 16QAM | QPSK | 16QAM | QPSK | 16QAM | QPSK | 16QAM | ||
1 | SPIHT | 40 | 47 | 29 | 41 | 29 | 42 | 24 | 27 |
2 | STW | 39 | 33 | 30 | 39 | 31 | 35 | 24 | 28 |
3 | STCHE | 32 | 46 | 32 | 42 | 27 | 45 | 22 | 30 |
4 | Ezw | 33 | 51 | 33 | 40 | 25 | 45 | 22 | 32 |
5 | WDR | 36 | 44 | 30 | 36 | 31 | 42 | 22 | 30 |
6 | ASWDR | 33 | 44 | 30 | 40 | 32 | 45 | 23 | 30 |
7 | SPIHT_3D | 31 | 33 | 23 | 36 | 27 | 32 | 21 | 29 |
8 | GBL_MMC_F | 34 | 32 | 30 | 37 | 31 | 44 | 25 | 30 |
9 | GBL_MMC_H | 36 | 33 | 36 | 35 | 34 | 37 | 22 | 35 |
4.2 The second scenario
Method no. | Compression method | SUI3 channel | |||||||
---|---|---|---|---|---|---|---|---|---|
DFT-LOFDMA | DFT-IOFDMA | DST-LOFDMA | DST-IOFDMA | ||||||
QPSK | 16QAM | QPSK | 16QAM | QPSK | 16QAM | QPSK | 16QAM | ||
1 | SPIHT | 27 | 32 | 24 | 29 | 20 | 30 | 20 | 28 |
2 | STW | 22 | 31 | 24 | 35 | 22 | 36 | 21 | 30 |
3 | STCHE | 26 | 31 | 26 | 33 | 21 | 38 | 21 | 32 |
4 | Ezw | 23 | 32 | 26 | 33 | 21 | 34 | 21 | 35 |
5 | WDR | 23 | 30 | 22 | 36 | 21 | 34 | 22 | 33 |
6 | ASWDR | 28 | 34 | 28 | 34 | 21 | 36 | 23 | 34 |
7 | SPIHT_3D | 19 | 30 | 19 | 31 | 20 | 28 | 18 | 31 |
8 | GBL_MMC_F | 22 | 36 | 30 | 29 | 24 | 38 | 24 | 29 |
9 | GBL_MMC_H | 22 | 31 | 22 | 37 | 21 | 46 | 21 | 30 |
4.3 The third scenario
Method no. | Compression method | Uniform channel | |||||||
---|---|---|---|---|---|---|---|---|---|
DFT-LOFDMA | DFT-IOFDMA | DST-LOFDMA | DST-IOFDMA | ||||||
QPSK | 16QAM | QPSK | 16QAM | QPSK | 16QAM | QPSK | 16QAM | ||
1 | SPIHT | 34 | 33 | 25 | 31 | 32 | 39 | 20 | 30 |
2 | STW | 28 | 35 | 25 | 37 | 25 | 35 | 22 | 35 |
3 | STCHE | 31 | 45 | 35 | 32 | 30 | 40 | 20 | 31 |
4 | Ezw | 26 | 36 | 35 | 42 | 33 | 38 | 23 | 30 |
5 | WDR | 35 | 45 | 27 | 38 | 26 | 42 | 23 | 32 |
6 | ASWDR | 36 | 38 | 35 | 36 | 30 | 38 | 21 | 33 |
7 | SPIHT_3D | 27 | 35 | 26 | 31 | 26 | 34 | 21 | 29 |
8 | GBL_MMC_F | 25 | 37 | 35 | 34 | 30 | 36 | 25 | 31 |
9 | GBL_MMC_H | 27 | 35 | 26 | 34 | 26 | 36 | 21 | 33 |
Method no. | Vehicular A-DFT-LOFDMA | Vehicular A-DFT-IOFDMA | Vehicular A-DST-LOFDMA | Vehicular A-DST-IOFDMA | SUI3-DFT-LOFDMA | SUI3-DFT-IOFDMA | SUI3-DST-LOFDMA | SUI3-DST-IOFDMA | Uniform-DFT-LOFDMA | Uniform- FT-IOFDMA | Uniform-DST-LOFDMA | Uniform-DST-IOFDMA |
---|---|---|---|---|---|---|---|---|---|---|---|---|
1 | 40 | 29 | 29 | 24 | 27 | 24 | 20 | 20 | 34 | 25 | 32 | 20 |
2 | 39 | 30 | 31 | 24 | 22 | 24 | 22 | 21 | 28 | 25 | 25 | 22 |
3 | 32 | 32 | 27 | 22 | 26 | 26 | 21 | 21 | 31 | 35 | 30 | 20 |
4 | 33 | 33 | 25 | 22 | 23 | 26 | 21 | 21 | 26 | 35 | 33 | 23 |
5 | 36 | 30 | 31 | 22 | 23 | 22 | 21 | 22 | 35 | 27 | 26 | 23 |
6 | 33 | 30 | 32 | 23 | 28 | 28 | 21 | 23 | 36 | 35 | 30 | 21 |
7 | 31 | 23 | 27 | 21 | 19 | 19 | 20 | 18 | 27 | 26 | 26 | 20 |
8 | 34 | 30 | 31 | 25 | 22 | 30 | 24 | 24 | 25 | 35 | 30 | 25 |
9 | 36 | 36 | 34 | 22 | 22 | 22 | 21 | 21 | 27 | 26 | 26 | 21 |
Method no. | Vehicular A-DFT-LOFDMA | Vehicular A-DFT-IOFDMA | Vehicular A-DST-LOFDMA | Vehicular A-DST-IOFDMA | SUI3-DFT-LOFDMA | SUI3-DFT-IOFDMA | SUI3-DST-LOFDMA | SUI3-DST-IOFDMA | Uniform-DFT-LOFDMA | Uniform-DFT-IOFDMA | Uniform-DST-LOFDMA | Uniform-DST-IOFDMA |
---|---|---|---|---|---|---|---|---|---|---|---|---|
1 | 47 | 41 | 42 | 27 | 32 | 29 | 30 | 28 | 33 | 31 | 39 | 30 |
2 | 33 | 39 | 35 | 28 | 31 | 35 | 36 | 30 | 35 | 37 | 35 | 35 |
3 | 46 | 42 | 45 | 30 | 31 | 33 | 38 | 32 | 45 | 32 | 40 | 31 |
4 | 51 | 40 | 45 | 32 | 32 | 33 | 34 | 35 | 36 | 42 | 38 | 30 |
5 | 44 | 36 | 42 | 30 | 30 | 36 | 34 | 33 | 45 | 38 | 42 | 32 |
6 | 44 | 40 | 45 | 30 | 34 | 34 | 36 | 34 | 38 | 36 | 38 | 33 |
7 | 33 | 36 | 32 | 29 | 30 | 31 | 28 | 31 | 35 | 31 | 34 | 29 |
8 | 32 | 37 | 44 | 30 | 36 | 29 | 38 | 29 | 37 | 34 | 36 | 31 |
9 | 33 | 35 | 37 | 35 | 31 | 37 | 46 | 30 | 35 | 34 | 36 | 33 |
No. | Appropriate compress method | Minimum SNR (dB) ≥ | Appropriate system (s) |
---|---|---|---|
1 | SPIHT | 20 | DST-LOFDMA-QPSK-SUI3, DST-IOFDMA-QPSK-SUI3, DST-IOFDMA-QPSK-Uniform |
2 | STW | 21 | DST-IOFDMA-QPSK-SUI3 |
3 | STCHE | 21 | DST-IOFDMA-QPSK- Uniform |
4 | Ezw | 21 | DST-LOFDMA-QPSK-SUI3, DST-IOFDMA-QPSK-SUI3 |
5 | WDR | 21 | DST-LOFDMA-QPSK- SUI3 |
6 | ASWDR | 21 | DST-LOFDMA-QPSK-SUI3 DST-IOFDMA-QPSK-Uniform |
7 | SPIHT_3D | 18 | DST-IOFDMA-QPSK-SUI3 |
8 | GBL_MMC_F | 22 | DFT-LOFDMA-QPSK-SUI3 |
9 | GBL_MMC_H | 21 | DST-LOFDMA-QPSK-SUI3, DST-IOFDMA-QPSK-SUI3 DST-IOFDMA-QPSK-Uniform |