Final assignment

leolei

In this nal assignment, we respectively attempt to build a complete ofdm

system and the following is a combine summary of our each’s work.

part one

-->code:

-->main.m

clc

clear

close all

%% 基础信息

m = 2;%调制等级(QAM)

N = 100;%发射 OFDM 块个数

num_bit = N*m*48/2;%输入二进制比特个数

pilot_out = zeros(N,52)';%插入导频输出

map_out = zeros(N,64)';%mapping 输出

%insert-pilot&mapping 索引

%###############

DataSubcPatt = [1:5 7:19 21:26 27:32 34:46 48:52];

PilotSubcPatt = [6 20 33 47];

UsedSubcIdx = [7:32 34:59];

Reorder = [33:64 1:32];

%###############

%% 测试

N_tn2 = 250;

snr = 12:0.1:16;

for tn1=1:length(snr)

counter = 0;

for tn2=1:N_tn2

%% %%%%%%%%%%%%################发射端###########

################

%%%%%%%信道编码

in_bit = randi([0,1],1,num_bit);%输入随机二进制流

trellis = poly2trellis(7,[133,171]);%生成卷积编码码树

conv_encode_bit = convenc(in_bit,trellis);%1/2 卷积信道编码

%%%%%%%交织

interleaved_bits = tx_interleaver(conv_encode_bit,48, m);

%%%%%%%m 阶 QAM 调制

qam_in = reshape(interleaved_bits,num_bit*2/m,m);%串并转换

qam_out = qammod(bi2de(qam_in),2.^m,'UnitAveragePower',true);%qam 调制

%%%%%%%mapping

%插入导频

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