From e57afffecf6e595f9039c8a1d66eb862cb984188 Mon Sep 17 00:00:00 2001
From: Ahmet Inan <xdsopl@gmail.com>
Date: Fri, 10 Feb 2023 09:15:52 +0100
Subject: [PATCH] need to align the rotation

---
 decode.cc | 5 +++--
 encode.cc | 2 +-
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/decode.cc b/decode.cc
index ebdec08..3d5bd49 100644
--- a/decode.cc
+++ b/decode.cc
@@ -73,7 +73,7 @@ public:
 
 	SchmidlCox(const cmplx *sequence) : threshold(value(0.2*match_len), value(0.3*match_len))
 	{
-#if 0
+#if 1
 		fsh.omega(-1, symbol_len);
 #endif
 		for (int i = 0; i < symbol_len; ++i)
@@ -84,7 +84,8 @@ public:
 	}
 	bool operator()(const cmplx *samples)
 	{
-		cmplx P = cor(fsh() * samples[search_pos] * conj(samples[search_pos+symbol_len+guard_len]));
+		cmplx S = fsh();
+		cmplx P = conj(S) * cor(S * samples[search_pos] * conj(samples[search_pos+symbol_len+guard_len]));
 		value R = value(0.5) * pwr(norm(samples[search_pos]) + norm(samples[search_pos+symbol_len+guard_len]));
 		value min_R = 0.0001 * symbol_len;
 		R = std::max(R, min_R);
diff --git a/encode.cc b/encode.cc
index 39dbdf4..bef988e 100644
--- a/encode.cc
+++ b/encode.cc
@@ -68,7 +68,7 @@ struct Encoder
 		CODE::MLS seq(0b1100111);
 		for (int i = 0; i < symbol_len; ++i)
 			fdom[i] = 0;
-#if 0
+#if 1
 		fdom[first_subcarrier+1] = std::sqrt(value(2 * symbol_len) / value(subcarrier_count));
 		for (int i = first_subcarrier + 2; i < first_subcarrier + subcarrier_count + 1; ++i)
 			fdom[i] = fdom[i-1] * cmplx(nrz(seq()));