from?__future__?import?division
import?numpy?as?np
import?scipy.interpolate?
import?tensorflow?as?tf
import?math
import?os
K?=?64
CP?=?K//4
P?=?64?#?number?of?pilot?carriers?per?OFDM?block
#pilotValue?=?1+1j
allCarriers?=?np.arange（K）??#?indices?of?all?subcarriers?（[0?1?...?K-1]）
pilotCarriers?=?allCarriers[::K//P]?#?Pilots?is?every?（K/P）th?carrier.
#pilotCarriers?=?np.hstack（[pilotCarriers?np.array（[allCarriers[-1]]）]）
#P?=?P+1
dataCarriers?=?np.delete（allCarriers?pilotCarriers）
mu?=?2
payloadBits_per_OFDM?=?len（dataCarriers）*mu??#?number?of?payload?bits?per?OFDM?symbol

payloadBits_per_OFDM?=?K*mu

SNRdb?=?20??#?signal?to?noise-ratio?in?dB?at?the?receiver?

mapping_table?=?{
????（00）?:?-1-1j
????（01）?:?-1+1j
????（10）?:?1-1j
????（11）?:?1+1j
}

demapping_table?=?{v?:?k?for?k?v?in?mapping_table.items（）}

def?Modulation（bits）:????????????????????????????????????????
????bit_r?=?bits.reshape（（int（len（bits）/mu）?mu））??????????????????
????return?（2*bit_r[:0]-1）+1j*（2*bit_r[:1]-1）????????????????????????????????????#?This?is?just?for?QAM?modulation

def?OFDM_symbol（Data?pilot_flag）:
????symbol?=?np.zeros（K?dtype=complex）?#?the?overall?K?subcarriers
????#symbol?=?np.zeros（K）?
????symbol[pilotCarriers]?=?pilotValue??#?allocate?the?pilot?subcarriers?
????symbol[dataCarriers]?=?Data??#?allocate?the?pilot?subcarriers
????return?symbol

def?IDFT（OFDM_data）:
????return?np.fft.ifft（OFDM_data）

def?addCP（OFDM_time）:
????cp?=?OFDM_time[-CP:]???????????????#?take?the?last?CP?samples?...
????return?np.hstack（[cp?OFDM_time]）??#?...?and?add?them?to?the?beginning

def?channel（signalchannelResponseSNRdb）:
????convolved?=?np.convolve（signal?channelResponse）
????signal_power?=?np.mean（abs（convolved**2））
????sigma2?=?signal_power?*?10**（-SNRdb/10）??
????noise?=?np.sqrt（sigma2/2）?*?（np.random.randn（*convolved.shape）+1j*np.random.randn（*convolved.shape））
????return?convolved?+?noise

def?removeCP（signal）:
????return?signal[CP:（CP+K）]

def?DFT（OFDM_RX）:
????return?np.fft.fft（OFDM_RX）


def?equalize（OFDM_demod?Hest）:
????return?OFDM_demod?/?Hest

def?get_payload（equalized）:
????return?equalized[dataCarriers]


def?PS（bits）:
????return?bits.reshape（（-1））




def?ofdm_simulate（codeword?channelResponseSNRdb）:???????
????OFDM_data?=?np.zeros（K?dtype=complex）
????OFDM_data[allCarriers]?=?pilotValue
????OFDM_time?=?IDFT（OFDM_data）
????OFDM_withCP?=?addCP（OFDM_time）
????OFDM_TX?=?OFDM_withCP
????OFDM_RX?=?channel（OFDM_TX?channelResponseSNRdb）
????OFDM_RX_noCP?=?removeCP（OFDM_RX）

????#?-----?target?inputs?---
????symbol?=?np.zeros（K?dtype=complex）
????codeword_qam?=?Modulation（codeword）
????symbol[np.arange（K）]?=?codeword_qam
????OFDM_data_codeword?=?symbol
????OFDM_time_codeword?=?np.fft.ifft（OFDM_data_codeword）
????OFDM_withCP_cordword?=?addCP（OFDM_time_codeword）
????OFDM_RX_codeword?=?channel（OFDM_withCP_cordword?channelResponseSNRdb）
????OFDM_RX_noCP_codeword?=?removeCP（OFDM_RX_codeword）
????return?np.concatenate（（np.concatenate（（np.real（OFDM_RX_

?屬性????????????大小?????日期????時(shí)間???名稱
-----------?---------??----------?-----??----

????.......?????11738??2017-12-22?04:06??Power?of?Deep?Learning?for?Channel?Estimation?and?Signal?Detection?in?OFDM?Systems\DNN_Detection\Example.py

?????文件??????14320??2018-11-16?14:27??Power?of?Deep?Learning?for?Channel?Estimation?and?Signal?Detection?in?OFDM?Systems\DNN_Detection\Example_read.py

?????文件????????590??2018-11-16?09:32??Power?of?Deep?Learning?for?Channel?Estimation?and?Signal?Detection?in?OFDM?Systems\DNN_Detection\Main.py

?????文件??????13436??2018-11-21?14:11??Power?of?Deep?Learning?for?Channel?Estimation?and?Signal?Detection?in?OFDM?Systems\DNN_Detection\OFDM_ChannelEstimation_DeepLearning_QAM_random_pilot.py

????.......?????15348??2017-12-22?04:06??Power?of?Deep?Learning?for?Channel?Estimation?and?Signal?Detection?in?OFDM?Systems\DNN_Detection\OFDM_ChannelEstimation_DeepLearning_QAM_random_pilot_withoutCP.py

????.......?????14999??2017-12-22?04:06??Power?of?Deep?Learning?for?Channel?Estimation?and?Signal?Detection?in?OFDM?Systems\DNN_Detection\OFDM_ChannelEstimation_DeepLearning_QAM_random_pilot_with_different_pilots.py

?????文件????????881??2018-11-16?10:06??Power?of?Deep?Learning?for?Channel?Estimation?and?Signal?Detection?in?OFDM?Systems\DNN_Detection\partial?test.py

????.......???????800??2017-12-22?04:06??Power?of?Deep?Learning?for?Channel?Estimation?and?Signal?Detection?in?OFDM?Systems\DNN_Detection\Pilot_16

????.......??????3200??2017-12-22?04:06??Power?of?Deep?Learning?for?Channel?Estimation?and?Signal?Detection?in?OFDM?Systems\DNN_Detection\Pilot_64

????.......???????400??2017-12-22?04:06??Power?of?Deep?Learning?for?Channel?Estimation?and?Signal?Detection?in?OFDM?Systems\DNN_Detection\Pilot_8

?????文件????????232??2018-11-15?18:41??Power?of?Deep?Learning?for?Channel?Estimation?and?Signal?Detection?in?OFDM?Systems\DNN_Detection\ReadMe.txt

????.......??????6374??2017-12-22?04:06??Power?of?Deep?Learning?for?Channel?Estimation?and?Signal?Detection?in?OFDM?Systems\DNN_Detection\Test.py

?????文件???????9998??2018-11-16?12:28??Power?of?Deep?Learning?for?Channel?Estimation?and?Signal?Detection?in?OFDM?Systems\DNN_Detection\Train.py

????.......??????6582??2017-12-22?04:06??Power?of?Deep?Learning?for?Channel?Estimation?and?Signal?Detection?in?OFDM?Systems\DNN_Detection\Train.pyc

????.......??????7486??2017-12-22?04:06??Power?of?Deep?Learning?for?Channel?Estimation?and?Signal?Detection?in?OFDM?Systems\DNN_Detection\utils.py

????.......??????5220??2017-12-22?04:06??Power?of?Deep?Learning?for?Channel?Estimation?and?Signal?Detection?in?OFDM?Systems\DNN_Detection\utils.pyc

????.......???????285??2017-12-22?04:06??Power?of?Deep?Learning?for?Channel?Estimation?and?Signal?Detection?in?OFDM?Systems\ReadMe.rst

?????文件????????287??2018-11-15?13:47??Power?of?Deep?Learning?for?Channel?Estimation?and?Signal?Detection?in?OFDM?Systems\網(wǎng)上說明.txt

?????目錄??????????0??2019-01-01?15:47??Power?of?Deep?Learning?for?Channel?Estimation?and?Signal?Detection?in?OFDM?Systems\DNN_Detection

?????目錄??????????0??2018-11-21?14:03??Power?of?Deep?Learning?for?Channel?Estimation?and?Signal?Detection?in?OFDM?Systems

-----------?---------??----------?-----??----

???????????????112176????????????????????20