www.gusucode.com > LTE仿真Matlab源码 > LTE_SNR_estimator.m
function [S_plus_noise_power N_power] = LTE_SNR_estimator(LTE_params,rx_signal); % % % Author: Michal Simko, msimko@nt.tuwien.ac.at % (c) by INTHFT % www.nt.tuwien.ac.at % % input : % output: tx_streams ... struct containing TX data % streams % % date of creation: 2011/04/04 % last changes: 2011/04/04 Simko % noise power estimation noise_start = abs(rx_signal(1:LTE_params.number_of_zeros_for_SNR_estimation,:)).^2; noise_end = abs(rx_signal(end-LTE_params.number_of_zeros_for_SNR_estimation+1:end,:)).^2; %nosise_power_vec = [noise_start; noise_end]; N_power = (1/(LTE_params.Nfft/LTE_params.Ntot))*[mean(noise_start,1); mean(noise_end,1)]; % signal power estimation start_pos = ceil(length(rx_signal)/2); nr_of_samples = floor(start_pos/LTE_params.number_of_zeros_for_SNR_estimation)-2; S_plus_noise_power = mean(abs(rx_signal(start_pos-nr_of_samples*LTE_params.number_of_zeros_for_SNR_estimation:start_pos+nr_of_samples*LTE_params.number_of_zeros_for_SNR_estimation,:)).^2);