diff --git a/src/wifi/model/wifi-tx-vector.cc b/src/wifi/model/wifi-tx-vector.cc
index a259a7ad4..1c487867b 100644
--- a/src/wifi/model/wifi-tx-vector.cc
+++ b/src/wifi/model/wifi-tx-vector.cc
@@ -119,6 +119,23 @@ WifiTxVector::GetMode (uint16_t staId) const
   return m_mode;
 }
 
+WifiModulationClass
+WifiTxVector::GetModulationClass (void) const
+{
+  NS_ABORT_MSG_IF (!m_modeInitialized, "WifiTxVector mode must be set before using");
+
+  // TODO Replace the following with IsMu when available
+  if (m_preamble == WIFI_PREAMBLE_VHT_MU
+      || m_preamble == WIFI_PREAMBLE_HE_MU
+      || m_preamble == WIFI_PREAMBLE_HE_TB)
+    {
+      NS_ASSERT (!m_muUserInfos.empty ());
+      // all the modes belong to the same modulation class
+      return m_muUserInfos.begin ()->second.mcs.GetModulationClass ();
+    }
+  return m_mode.GetModulationClass ();
+}
+
 uint8_t
 WifiTxVector::GetTxPowerLevel (void) const
 {
diff --git a/src/wifi/model/wifi-tx-vector.h b/src/wifi/model/wifi-tx-vector.h
index 5365f8be4..65dc49c24 100644
--- a/src/wifi/model/wifi-tx-vector.h
+++ b/src/wifi/model/wifi-tx-vector.h
@@ -137,6 +137,13 @@ public:
   */
   void SetMode (WifiMode mode, uint16_t staId);
 
+  /**
+   * Get the modulation class specified by this TXVECTOR.
+   *
+   * \return the Modulation Class specified by this TXVECTOR
+   */
+  WifiModulationClass GetModulationClass (void) const;
+
   /**
    * \returns the transmission power level
    */