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大小: 35KB文件類型: .rar金幣: 2下載: 1 次發(fā)布日期: 2021-05-08
- 語(yǔ)言: 其他
- 標(biāo)簽: 深度學(xué)習(xí)??OFDM系統(tǒng)??信道估計(jì)??
資源簡(jiǎn)介
本資源是文獻(xiàn)Power of Deep Learning for Channel Estimation and Signal Detection in OFDM Systems的代碼部分

代碼片段和文件信息
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
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