merge

src/lte/test/reference/lte_amc.m

@@ -0,0 +1,79 @@
+
+clear all;
+close all;
+
+snr_db = (0:30)';
+snr = (10.^(snr_db./10));
+
+
+## this model is from:
+## G. Piro, N. Baldo. M. Miozzo, "An LTE module for the ns-3 network simulator",
+## WNS3 2011 (in conjunction with SimuTOOLS 2011)
+## which cites this one:
+## "A Proportional-Fair Power Allocation Scheme for Fair and Efficient Multiuser OFDM Systems"
+
+
+ber = 0.00005;
+gamma = -log (5*ber/1.5);
+spectral_efficiency_piro2011 = log2(1 + snr./gamma);
+
+
+
+# ## this eventually would be an alternative model from:
+# ## Preben Mogensen et al., "LTE Capacity compared to the Shannon Bound"
+# ## IEEE VTC Spring 2007
+#
+# snr_eff = 1.25;
+# bw_eff_times_eta = 0.75;
+# spectral_efficiency_mogensen2007= bw_eff_times_eta .* log2(1 + snr./snr_eff);
+#
+# plot (snr_db, spectral_efficiency_piro2011, ";piro 2011;",
+#       snr_db, spectral_efficiency_mogensen2007, ";morgensen2007;");
+
+
+[snr_db spectral_efficiency_piro2011]
+
+## 
+## now that we got the spectral efficiency for each value of SNR in dB
+## you should do the following:
+## we look up (manually) into the XLS sheet annexed to 3GPP R1-081483 "Conveying MCS
+## and TB size via PDCCH". Look at the tab "MCS Table", quantize the
+## spectral efficiency based on the CQI (rounding to the lowest value), and get the corresponding MCS
+## scheme (i.e., the MCS index that appears on the same line looking at
+## the MCS table on the right).
+##
+
+## the resulting values after the manual lookup are reported here:
+## SNR (dB)     sp. eff  MCS index
+##  0.00000    0.15698         1
+##  1.00000    0.19498         1
+##  2.00000    0.24145         3
+##  3.00000    0.29790         3
+##  4.00000    0.36596         5
+##  5.00000    0.44732         5
+##  6.00000    0.54361         5
+##  7.00000    0.65637         7
+##  8.00000    0.78683         7
+##  9.00000    0.93589         9
+## 10.00000    1.10399         9
+## 11.00000    1.29109         11
+## 12.00000    1.49662         13
+## 13.00000    1.71964         13
+## 14.00000    1.95880         15
+## 15.00000    2.21257         15
+## 16.00000    2.47928         17
+## 17.00000    2.75726         19
+## 18.00000    3.04488         19
+## 19.00000    3.34066         21
+## 20.00000    3.64327         21
+## 21.00000    3.95151         23
+## 22.00000    4.26440         23
+## 23.00000    4.58107         25
+## 24.00000    4.90081         25
+## 25.00000    5.22304         27
+## 26.00000    5.54726         27
+## 27.00000    5.87310         29
+## 28.00000    6.20022         29
+## 29.00000    6.52837         29
+## 30.00000    6.85735         29
+