ofdmtxrx.ofdmTxRx Class Reference

Public Member Functions
def	__init__ (self)
def	bpsk_mod (self, val)
def	qpsk_mod (self, val)
def	qam16_mod (self, val)
def	qam64_mod (self, val)
def	bpsk_dem (self, iq)
def	qpsk_dem (self, iq)
def	qam16_dem (self, iq)
def	qam64_dem (self, iq)
def	generate_data (self, n_ofdm_syms=100, mod_order=4, cp_length=16, datastream=[])
def	modulation (self, in_data, mod_order)
def	demodulation (self, in_data, mod_order)
def	cfo_correction (self, rxSignal, lts_start, lts_syms_len, fft_offset)
def	sfo_correction (self, rxSig_freq_eq, pilot_sc, pilots_matrix, n_ofdm_syms)
def	phase_correction (self, rxSig_freq_eq, pilot_sc, pilots_matrix)
def	demult (self, csi, data, noise=None, method='zf')
def	calcBW (self, csi, noise=None, method='zf')

Public Attributes
	n_ofdm_syms
	mod_order
	cp_length

Detailed Description

OFDM Library

Constructor & Destructor Documentation

__init__()

def ofdmtxrx.ofdmTxRx.__init__

(

self

)

Member Function Documentation

bpsk_dem()

def ofdmtxrx.ofdmTxRx.bpsk_dem	(		self,
			iq
	)

BPSK Demodulation
ARGS
    - iq: Complex data symbol
RETURNS:
    - val: Integer value (data symbol) between 0 and 1

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bpsk_mod()

def ofdmtxrx.ofdmTxRx.bpsk_mod	(		self,
			val
	)

BPSK Modulation
ARGS
    - val: Integer value (data symbol) between 0 and 1
RETURNS:
    - iq: Complex data symbol

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calcBW()

def ofdmtxrx.ofdmTxRx.calcBW	(		self,
			csi,
			noise = None,
			method = 'zf'
	)

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cfo_correction()

def ofdmtxrx.ofdmTxRx.cfo_correction	(		self,
			rxSignal,
			lts_start,
			lts_syms_len,
			fft_offset
	)

Apply Carrier Frequency Offset
Input:
    rxSignal     - Received IQ Signal
    lts_start    - Sample where LTS begins
    lts_syms_len - Length of LTS Symbol
    fft_offset   - Number of CP samples for FFT
Output:
    coarse_cfo_est - CFO estimate

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demodulation()

def ofdmtxrx.ofdmTxRx.demodulation	(		self,
			in_data,
			mod_order
	)

Demodulate data stream of n_ofdm_syms number of symbols, according to mod_order.

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demult()

def ofdmtxrx.ofdmTxRx.demult	(		self,
			csi,
			data,
			noise = None,
			method = 'zf'
	)

csi: Frame, User, Antenna, Subcarrier

data: Frame, Uplink Syms, Antenna, Subcarrier

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generate_data()

def ofdmtxrx.ofdmTxRx.generate_data	(		self,
			n_ofdm_syms = 100,
			mod_order = 4,
			cp_length = 16,
			datastream = []
	)

Generate random data stream of n_ofdm_syms number of symbols,
and modulate according to mod_order.
ARGS:
    - n_ofdm_syms: Number of OFDM symbols
    - mod_order: Modulation Order
2 - BPSK
4 - QPSK
16 - 16QAM
64 - 64QAM
    - cp_length: Length of cyclic prefix
RETURNS:
    - signal: Time domain signal after IFFT and added Cyclic Prefix
    - data: Modulated data stream (Constellation)
    - data_i: Random data to be transmitted
    - sc_idx_all: Indexes for both data and pilot subcarriers

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modulation()

def ofdmtxrx.ofdmTxRx.modulation	(		self,
			in_data,
			mod_order
	)

Demodulate data stream of n_ofdm_syms number of symbols, according to mod_order.

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phase_correction()

def ofdmtxrx.ofdmTxRx.phase_correction	(		self,
			rxSig_freq_eq,
			pilot_sc,
			pilots_matrix
	)

Apply Phase Correction
Input:
    rxSig_freq_eq - Equalized, time domain received signal
    pilot_sc      - Pilot subcarriers (indexes)
    pilots_matrix - Pilots in matrix form
Output:
    phase_error   - Computed phase error

qam16_dem()

def ofdmtxrx.ofdmTxRx.qam16_dem	(		self,
			iq
	)

16QAM Demodulation
ARGS
    - iq: Complex data symbol
RETURNS:
    - val: Integer value (data symbol) between 0 and 15 (i.e., 0:1:15)

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qam16_mod()

def ofdmtxrx.ofdmTxRx.qam16_mod	(		self,
			val
	)

16QAM Modulation
ARGS
    - val: Integer value (data symbol) between 0 and 15 (i.e., 0:1:15)
RETURNS:
    - iq: Complex data symbol

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qam64_dem()

def ofdmtxrx.ofdmTxRx.qam64_dem	(		self,
			iq
	)

64QAM Demodulation
ARGS
    - iq: Complex data symbol
RETURNS:
    - val: Integer value (data symbol) between 0 and 63 (i.e., 0:1:63)

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qam64_mod()

def ofdmtxrx.ofdmTxRx.qam64_mod	(		self,
			val
	)

64QAM Modulation
ARGS
    - val: Integer value (data symbol) between 0 and 63 (i.e., 0:1:63)
RETURNS:
    - iq: Complex data symbol

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qpsk_dem()

def ofdmtxrx.ofdmTxRx.qpsk_dem	(		self,
			iq
	)

QPSK Demodulation
ARGS
    - iq: Complex data symbol
RETURNS:
    - val: Integer value (data symbol) between 0 and 3 (i.e., 0:1:3)

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qpsk_mod()

def ofdmtxrx.ofdmTxRx.qpsk_mod	(		self,
			val
	)

QPSK Modulation
ARGS
    - val: Integer value (data symbol) between 0 and 3 (i.e., 0:1:3)
RETURNS:
    - iq: Complex data symbol

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sfo_correction()

def ofdmtxrx.ofdmTxRx.sfo_correction	(		self,
			rxSig_freq_eq,
			pilot_sc,
			pilots_matrix,
			n_ofdm_syms
	)

Apply Sample Frequency Offset
Input:
    rxSig_freq_eq - Equalized, frequency domain received signal
    pilot_sc      - Pilot subcarriers (indexes)
    pilots_matrix - Pilots in matrix form
    n_ofdm_syms   - Number of OFDM symbols
Output:
    rxSig_freq_eq - Frequency domain signal after SFO correction

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Member Data Documentation

cp_length

ofdmtxrx.ofdmTxRx.cp_length

mod_order

ofdmtxrx.ofdmTxRx.mod_order

n_ofdm_syms

ofdmtxrx.ofdmTxRx.n_ofdm_syms

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The documentation for this class was generated from the following file:

• tools/python/ofdmtxrx.py