diff --git a/03. Rx Path/apply_lna_and_mixer.m b/03. Rx Path/apply_lna_and_mixer.m
index a35a94d..a03abcf 100644
--- a/03. Rx Path/apply_lna_and_mixer.m	
+++ b/03. Rx Path/apply_lna_and_mixer.m	
@@ -33,6 +33,7 @@ function [adc_raw_data, adc_combined] = apply_lna_and_mixer(RxOut, TxOut, RadarP
     NumTx = RadarParams.Antenna.NumTx;
     rxPathGain_dB = RadarParams.Rxpath.rxPathGain_dB;
     system_NF_dB = RadarParams.Rxpath.system_NF_dB;
+    impedance_ohm = 50; % 임피던스 기준 (일반적으로 50옴)
     PA_Profile = RadarParams.RFOutput.PA_Profile;
     SpurParams = RadarParams.SpurParams;
     enable_spur = true;
@@ -59,8 +60,8 @@ function [adc_raw_data, adc_combined] = apply_lna_and_mixer(RxOut, TxOut, RadarP
         P_inst_dBm = interp1(PA_Profile(:,1), PA_Profile(:,2), f_inst, 'linear', 'extrap');
     end
     
-    % dBm -> Watt -> 전압 진폭(V) 변환 (50옴 시스템 기준)
-    Vtx_inst = sqrt(10.^((P_inst_dBm - 30) / 10) * 50); 
+    % dBm -> Watt -> 전압 진폭(V) 변환 (임피던스 기준)
+    Vtx_inst = sqrt(10.^((P_inst_dBm - 30) / 10) * impedance_ohm); 
     
     % --- 2. 수신단 시스템 잡음 계산 ---
     T_ref = RadarParams.Basic.T0;      
@@ -71,7 +72,7 @@ function [adc_raw_data, adc_combined] = apply_lna_and_mixer(RxOut, TxOut, RadarP
     
     % ADC 입력단 기준 최종 잡음 전력 및 전압 표준편차
     P_noise_total_W = P_noise_floor_W * system_NF_lin * rxPathGain_lin;
-    sigma_n = sqrt(P_noise_total_W * 50); 
+    sigma_n = sqrt(P_noise_total_W * impedance_ohm); 
 
     % --- MIMO 모드에 따른 TX 활성화 패턴 계산 ---
     % TDM: 처프마다 다른 TX만 활성화