--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/wifi/model/nist-error-rate-model.cc Fri Mar 04 01:26:54 2011 +0000
@@ -0,0 +1,282 @@
+/* -*- Mode: C++; c-file-style: "gnu"; indent-tabs-mode:nil; -*- */
+/*
+ * Copyright (c) 2010 The Boeing Company
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation;
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ * Author: Gary Pei <guangyu.pei@boeing.com>
+ */
+#include "nist-error-rate-model.h"
+#include "wifi-phy.h"
+#include "ns3/log.h"
+
+NS_LOG_COMPONENT_DEFINE ("NistErrorRateModel");
+
+namespace ns3 {
+
+NS_OBJECT_ENSURE_REGISTERED (NistErrorRateModel);
+
+TypeId
+NistErrorRateModel::GetTypeId (void)
+{
+ static TypeId tid = TypeId ("ns3::NistErrorRateModel")
+ .SetParent<ErrorRateModel> ()
+ .AddConstructor<NistErrorRateModel> ()
+ ;
+ return tid;
+}
+
+NistErrorRateModel::NistErrorRateModel ()
+{
+}
+
+double
+NistErrorRateModel::GetBpskBer (double snr) const
+{
+ double z = sqrt(snr);
+ double ber = 0.5 * erfc(z);
+ NS_LOG_INFO ("bpsk snr="<<snr<<" ber="<<ber);
+ return ber;
+}
+double
+NistErrorRateModel::GetQpskBer (double snr) const
+{
+ double z = sqrt(snr/2.0);
+ double ber = 0.5 * erfc(z);
+ NS_LOG_INFO ("qpsk snr="<<snr<<" ber="<<ber);
+ return ber;
+}
+double
+NistErrorRateModel::Get16QamBer (double snr) const
+{
+ double z = sqrt(snr/(5.0 * 2.0));
+ double ber = 0.75 * 0.5 * erfc(z);
+ NS_LOG_INFO ("16-Qam" << " snr="<<snr<<" ber="<<ber);
+ return ber;
+}
+double
+NistErrorRateModel::Get64QamBer (double snr) const
+{
+ double z = sqrt(snr/(21.0 * 2.0));
+ double ber = 7.0 / 12.0 * 0.5 * erfc(z);
+ NS_LOG_INFO ("64-Qam" << " snr="<<snr<<" ber="<<ber);
+ return ber;
+}
+double
+NistErrorRateModel::GetFecBpskBer (double snr, double nbits,
+ uint32_t bValue) const
+{
+ double ber = GetBpskBer (snr);
+ if (ber == 0.0)
+ {
+ return 1.0;
+ }
+ double pe = CalculatePe (ber, bValue);
+ pe = std::min (pe, 1.0);
+ double pms = pow (1 - pe, nbits);
+ return pms;
+}
+double
+NistErrorRateModel::GetFecQpskBer (double snr, double nbits,
+ uint32_t bValue) const
+{
+ double ber = GetQpskBer (snr);
+ if (ber == 0.0)
+ {
+ return 1.0;
+ }
+ double pe = CalculatePe (ber, bValue);
+ pe = std::min (pe, 1.0);
+ double pms = pow (1 - pe, nbits);
+ return pms;
+}
+double
+NistErrorRateModel::CalculatePe (double p, uint32_t bValue) const
+{
+ double D = sqrt (4.0 * p * (1.0 -p));
+ double pe = 1.0;
+ if (bValue == 1)
+ {
+ // code rate 1/2, use table 3.1.1
+ pe = 0.5 * ( 36.0 * pow (D, 10.0)
+ + 211.0 * pow (D, 12.0)
+ + 1404.0 * pow (D, 14.0)
+ + 11633.0 * pow (D, 16.0)
+ + 77433.0 * pow (D, 18.0)
+ + 502690.0 * pow (D, 20.0)
+ + 3322763.0 * pow (D, 22.0)
+ + 21292910.0 * pow (D, 24.0)
+ + 134365911.0 * pow (D, 26.0)
+ );
+ }
+ else if (bValue == 2)
+ {
+ // code rate 2/3, use table 3.1.2
+ pe = 1.0 / (2.0 * bValue) *
+ ( 3.0 * pow (D, 6.0)
+ + 70.0 * pow (D, 7.0)
+ + 285.0 * pow (D, 8.0)
+ + 1276.0 * pow (D, 9.0)
+ + 6160.0 * pow (D, 10.0)
+ + 27128.0 * pow (D, 11.0)
+ + 117019.0 * pow (D, 12.0)
+ + 498860.0 * pow (D, 13.0)
+ + 2103891.0 * pow (D, 14.0)
+ + 8784123.0 * pow (D, 15.0)
+ );
+ }
+ else if (bValue == 3)
+ {
+ // code rate 3/4, use table 3.1.2
+ pe = 1.0 / (2.0 * bValue) *
+ ( 42.0 * pow (D, 5.0)
+ + 201.0 * pow (D, 6.0)
+ + 1492.0 * pow (D, 7.0)
+ + 10469.0 * pow (D, 8.0)
+ + 62935.0 * pow (D, 9.0)
+ + 379644.0 * pow (D, 10.0)
+ + 2253373.0 * pow (D, 11.0)
+ + 13073811.0 * pow (D, 12.0)
+ + 75152755.0 * pow (D, 13.0)
+ + 428005675.0 * pow (D, 14.0)
+ );
+ }
+ else
+ {
+ NS_ASSERT (false);
+ }
+ return pe;
+}
+
+double
+NistErrorRateModel::GetFec16QamBer (double snr, uint32_t nbits,
+ uint32_t bValue) const
+{
+ double ber = Get16QamBer (snr);
+ if (ber == 0.0)
+ {
+ return 1.0;
+ }
+ double pe = CalculatePe (ber, bValue);
+ pe = std::min (pe, 1.0);
+ double pms = pow (1 - pe, nbits);
+ return pms;
+}
+double
+NistErrorRateModel::GetFec64QamBer (double snr, uint32_t nbits,
+ uint32_t bValue) const
+{
+ double ber = Get64QamBer (snr);
+ if (ber == 0.0)
+ {
+ return 1.0;
+ }
+ double pe = CalculatePe (ber, bValue);
+ pe = std::min (pe, 1.0);
+ double pms = pow (1 - pe, nbits);
+ return pms;
+}
+double
+NistErrorRateModel::GetChunkSuccessRate (WifiMode mode, double snr, uint32_t nbits) const
+{
+ if (mode.GetModulationClass () == WIFI_MOD_CLASS_ERP_OFDM ||
+ mode.GetModulationClass () == WIFI_MOD_CLASS_OFDM)
+ {
+ if (mode.GetConstellationSize () == 2)
+ {
+ if (mode.GetCodeRate () == WIFI_CODE_RATE_1_2)
+ {
+ return GetFecBpskBer (snr,
+ nbits,
+ 1 // b value
+ );
+ }
+ else
+ {
+ return GetFecBpskBer (snr,
+ nbits,
+ 3 // b value
+ );
+ }
+ }
+ else if (mode.GetConstellationSize () == 4)
+ {
+ if (mode.GetCodeRate () == WIFI_CODE_RATE_1_2)
+ {
+ return GetFecQpskBer (snr,
+ nbits,
+ 1 // b value
+ );
+ }
+ else
+ {
+ return GetFecQpskBer (snr,
+ nbits,
+ 3 // b value
+ );
+ }
+ }
+ else if (mode.GetConstellationSize () == 16)
+ {
+ if (mode.GetCodeRate () == WIFI_CODE_RATE_1_2)
+ {
+ return GetFec16QamBer (snr,
+ nbits,
+ 1 // b value
+ );
+ }
+ else
+ {
+ return GetFec16QamBer (snr,
+ nbits,
+ 3 // b value
+ );
+ }
+ }
+ else if (mode.GetConstellationSize () == 64)
+ {
+ if (mode.GetCodeRate () == WIFI_CODE_RATE_2_3)
+ {
+ return GetFec64QamBer (snr,
+ nbits,
+ 2 // b value
+ );
+ }
+ else
+ {
+ return GetFec64QamBer (snr,
+ nbits,
+ 3 // b value
+ );
+ }
+ }
+ }
+ else if (mode.GetModulationClass () == WIFI_MOD_CLASS_DSSS)
+ {
+ switch (mode.GetDataRate ())
+ {
+ case 1000000:
+ return DsssErrorRateModel::GetDsssDbpskSuccessRate (snr, nbits);
+ case 2000000:
+ return DsssErrorRateModel::GetDsssDqpskSuccessRate (snr, nbits);
+ case 5500000:
+ return DsssErrorRateModel::GetDsssDqpskCck5_5SuccessRate (snr, nbits);
+ case 11000000:
+ return DsssErrorRateModel::GetDsssDqpskCck11SuccessRate (snr, nbits);
+ }
+ }
+ return 0;
+}
+
+} // namespace ns3