文件列表:

JSCCImage\AWGN1_RCPC.png (3838, 2012-04-27)
JSCCImage\awgn_EsN0.m (1165, 2012-04-27)
JSCCImage\BSC_BER.m (982, 2012-04-27)
JSCCImage\channels\AWGN1.txt (129, 2012-04-27)
JSCCImage\channels\AWGN2.txt (128, 2012-04-27)
JSCCImage\channels\AWGN_0dB.txt (123, 2012-04-27)
JSCCImage\channels\BSC1.txt (123, 2012-04-27)
JSCCImage\channels\GE1.txt (211, 2012-04-27)
JSCCImage\compute_gain.m (698, 2012-04-27)
JSCCImage\generic_crc.m (1114, 2012-04-27)
JSCCImage\get_channel.m (1605, 2012-04-27)
JSCCImage\get_RCPC_code.m (2386, 2012-04-27)
JSCCImage\GE_awgn.m (1857, 2012-04-27)
JSCCImage\LICENSE (1357, 2012-04-27)
JSCCImage\optimal_RCPC_equal.m (4499, 2012-04-27)
JSCCImage\optimal_RCPC_RS_equal.m (7935, 2012-04-27)
JSCCImage\optimal_RCPC_unequal.m (9530, 2012-04-27)
JSCCImage\probMSE2phi.m (328, 2012-04-27)
JSCCImage\Punct_codes.txt (1876, 2012-04-27)
JSCCImage\Punct_Variables.m (1422, 2012-04-27)
JSCCImage\RCPC_ch_epsilon.png (2004, 2012-04-27)
JSCCImage\RCPC_ch_ro.png (3911, 2012-04-27)
JSCCImage\RCPC_decode.m (1389, 2012-04-27)
JSCCImage\RCPC_encode.m (623, 2012-04-27)
JSCCImage\RCPC_performance\info.txt (180, 2012-04-27)
JSCCImage\RCPC_performance\RCPC_performance_10000x250.mat (2960, 2012-04-27)
JSCCImage\RCPC_performance\RCPC_performance_AWGN1.mat (400, 2012-04-27)
JSCCImage\RCPC_performance\RCPC_performance_AWGN2.mat (400, 2012-04-27)
JSCCImage\RCPC_performance\RCPC_performance_BSC1.mat (400, 2012-04-27)
JSCCImage\RCPC_performance\RCPC_performance_GE1.mat (400, 2012-04-27)
JSCCImage\RCPC_test_equal_data.m (2732, 2012-04-27)
JSCCImage\RCPC_test_equal_packet.m (2853, 2012-04-27)
JSCCImage\RDcurveBytePrec.m (464, 2012-04-27)
JSCCImage\RD_curve\info.txt (77, 2012-04-27)
JSCCImage\RD_curve\Lena256RD.mat (4256, 2012-04-27)
JSCCImage\script_channel_performance.m (3458, 2012-04-27)
JSCCImage\script_RCPC_performance.m (3857, 2012-04-27)
JSCCImage\script_send_image_RCPC.m (3769, 2012-04-27)
JSCCImage\send_image_equal.m (3028, 2012-04-27)
... ...

Joint Source-Channel Coding of Images Toolbox ============================================= Simulation of transmission of SPIHT encoded images over unreliable channels. Requires the MATLAB Communications Toolbox. Scripts for measuring the channel error rate, RCPC code characteristics and Rate-Distortion (R-D) curve of the SPIHT compression for the input image and selected channel characteristics. Functions --------- - **awgn_EsN0** - Simulation of the Additive White Gaussian Noise (AWGN) channel - **BSC_BER** - Simulation of the Binary Symemtric Channel (BSC) - **GE_awgn** - Simulation of the Gilbert-Elliot (GE) channel, using two AWGN channels - **get_channel** - Loads a predefined channel (saved in a txt file) - **get\_RCPC\_code** - Loads a predefined RCPC code from a default code family ('Punct_codes.txt') - **RCPC_encode** - Rate Compatible Punctured Convolutional (RCPC) coding of the binary stream - **RCPC\_test\_equal_data** - Transmission of packets with constant data part, using RCPC - **RCPC\_test\_equal_packet** - Transmission of packets with constant size, using RCPC - **optimal\_RCPC_equal** - Computes the Equal Error Protection (EEP) scheme for a given image and channel - **send\_image_equal** - Transmission of SPIHT encoded image using EEP - **send\_image\_equal_RS** - Transmission of SPIHT encoded image using EEP and Reed-Solomon protection - **optimal\_RCPC_unequal** - Computes the Unequal Error Protection (UEP) scheme for a given image and channel - **send\_image_unequal** - Transmission of SPIHT encoded image using UEP - **script\_channel_performance** - Measures the BER and PER values for RCPC transmission on a given channel - **RDcurveBytePrec** - Runs SPIHT over range of target bitrates and stores the R-D curve Examples -------- **get_channel** (contents of the file `AWGN1.txt`): ch_handle=@awgn_EsN0; parametar.EsN0=-0.8556; parametar.state=-1; parametar.Bch=128000; parametar.Nch=256; **get\_RCPC_code** (one RCPC entry from the file `Punct_codes.txt`): 8/9 [Hag88] Memory=6 CodeGenerator=[133 171 145] PunctCode=f78800 cd=[0,0,24,740,13321,217761,3315491,48278177] %Punctcode=[f7,88,00]=[1 1 1 1 0 1 1 1,1 0 0 0 1 0 0 0,0 0 0 0 0 0 0 0] **RCPC_encode**: >> signal=round(rand(1,8)) signal = 0 1 1 0 0 0 1 0 >> [Memory,Ib,Kb,t,PN,P,TotRate,PunctInd] = get_RCPC_code('8/9'); >> outsignal = RCPC_encode(signal,Memory,t,P,PunctInd) outsignal = 1 1 -1 -1 -1 1 -1 1 1 **RCPC\_test\_equal_data**: >> [diffvec,BER,PER]=RCPC_test_equal_data(100,128,'AWGN1','1/2',8,0); Mother code rate: 1/3 Puncturing code rate: 16/24 Total rate: 1/2 Packet size: 284 Number of packets: 100 Transmitted data bits: 12800 ***Errors Statistics*** Errors = 52 BER = 0.004063 Packet errors = 12 PER = 0.120000 (CRC) Correctly detected packet errors = 12 (CRC) Detected packet errors = 12 **script\_channel_performance**: >> script_channel_performance(@RCPC_test_equal_packet,100000,16,'GE1');   **optimal\_RCPC_equal**: >> optimal_RCPC_equal(1000,16,'GE1','Lena512RD','draw_small'); RCPC total rate: 1/1 - average PSNR: 17.281731 RCPC total rate: 8/9 - average PSNR: 18.406105 RCPC total rate: 4/5 - average PSNR: 18.432578 RCPC total rate: 2/3 - average PSNR: 19.129653 RCPC total rate: 4/7 - average PSNR: 21.051831 RCPC total rate: 1/2 - average PSNR: 24.052347 RCPC total rate: 4/9 - average PSNR: 26.97***99 RCPC total rate: 2/5 - average PSNR: 29.522427 RCPC total rate: 4/11 - average PSNR: 30.491567 RCPC total rate: 1/3 - average PSNR: 30.432119 *** Minimal distortion RCPC code: 4/11 PSNR: 30.491567 

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