From 67f958d52f37803b2a15dff99f8b27e04b4b17b6 Mon Sep 17 00:00:00 2001
From: Federico Guerra <federico@guerra-tlc.com>
Date: Thu, 12 Sep 2024 18:41:20 +0200
Subject: [PATCH] uan: (fixes #1115) Fixed PER calculation of M-QAM (fix
 reported by donghuiyong)

---
 src/uan/model/uan-phy-gen.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/uan/model/uan-phy-gen.cc b/src/uan/model/uan-phy-gen.cc
index d84d7a938..4125f9f86 100644
--- a/src/uan/model/uan-phy-gen.cc
+++ b/src/uan/model/uan-phy-gen.cc
@@ -334,7 +334,7 @@ UanPhyPerCommonModes::CalcPer(Ptr<Packet> pkt, double sinrDb, UanTxMode mode)
             // Eq (74)
             for (int j = 0; j < sum_items; ++j)
             {
-                PbK += ::std::pow(-1.0, (double)j * pow2k / sqrtM) *
+                PbK += ::std::pow(-1.0, ::std::floor((double)j * pow2k / sqrtM)) *
                        (pow2k - ::std::floor((double)(j * pow2k / sqrtM) + 0.5)) *
                        erfc((2.0 * (double)j + 1.0) *
                             ::std::sqrt(3.0 * (log2M * EbNo) / (2.0 * (M - 1.0))));