DoFFT Class Reference

#include <dofft.h>

Inheritance diagram for DoFFT:

Collaboration diagram for DoFFT:

Public Member Functions
	DoFFT (Config *config, size_t tid, Table< complex_float > &data_buffer, PtrGrid< kFrameWnd, kMaxUEs, complex_float > &csi_buffers, Table< complex_float > &calib_dl_buffer, Table< complex_float > &calib_ul_buffer, PhyStats *in_phy_stats, Stats *stats_manager)
	~DoFFT () override
EventData	Launch (size_t tag) override
void	PartialTranspose (complex_float *out_buf, size_t ant_id, SymbolType symbol_type) const
Public Member Functions inherited from Doer
virtual bool	TryLaunch (moodycamel::ConcurrentQueue< EventData > &task_queue, moodycamel::ConcurrentQueue< EventData > &complete_task_queue, moodycamel::ProducerToken *worker_ptok)
virtual EventData	Launch (size_t tag, EventType event_type)

Private Attributes
Table< complex_float > &	data_buffer_
PtrGrid< kFrameWnd, kMaxUEs, complex_float > &	csi_buffers_
Table< complex_float > &	calib_dl_buffer_
Table< complex_float > &	calib_ul_buffer_
DFTI_DESCRIPTOR_HANDLE	mkl_handle_
complex_float *	fft_inout_
complex_float *	fft_shift_tmp_
uint16_t *	temp_16bits_iq_
std::complex< float > *	rx_samps_tmp_
DurationStat *	duration_stat_fft_
DurationStat *	duration_stat_csi_
PhyStats *	phy_stats_

Additional Inherited Members
Protected Member Functions inherited from Doer
	Doer (Config *in_config, int in_tid)
virtual	~Doer ()=default
Protected Attributes inherited from Doer
Config *	cfg_
int	tid_

Constructor & Destructor Documentation

DoFFT()

DoFFT::DoFFT	(	Config *	config,
		size_t	tid,
		Table< complex_float > &	data_buffer,
		PtrGrid< kFrameWnd, kMaxUEs, complex_float > &	csi_buffers,
		Table< complex_float > &	calib_dl_buffer,
		Table< complex_float > &	calib_ul_buffer,
		PhyStats *	in_phy_stats,
		Stats *	stats_manager
	)

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~DoFFT()

DoFFT::~DoFFT ( )

override

Member Function Documentation

Launch()

EventData DoFFT::Launch ( size_t  tag )

overridevirtual

Do FFT task for one OFDM symbol

Parameters

tag	is an event data tag of type fft_req_tag_t

Buffers: socket_buffer_, fft_buffer_, csi_buffer_, data_buffer_ Input buffer: socket_buffer_ Output buffer: csi_buffer_ if symbol is pilot data_buffer_ if symbol is data Intermediate buffer: fft_buffer_ (FFT_inputs, FFT_outputs) Offsets: socket_buffer_: dim1: socket thread index: (offset / # of OFDM symbols per thread) dim2: OFDM symbol index in this socket thread (offset - # of symbols in previous threads) FFT_inputs, FFT_outputs: dim1: frame index

• # of OFDM symbols per frame + symbol index * # of atennas + antenna index dim2: subcarrier index csi_buffer_: dim1: frame index * FFT size + subcarrier index in the current frame dim2: user index * # of antennas + antenna index data_buffer_: dim1: frame index * # of data symbols per frame + data symbol index dim2: transpose block index * block size * # of antennas + antenna index * block size Event offset: frame index * # of symbol per frame + symbol index Description:
  1. copy received data (one OFDM symbol) from socket_buffer to fft_buffer_.FFT_inputs (remove CP)
  2. perform FFT on fft_buffer_.FFT_inputs and store results in fft_buffer_.FFT_outputs
  3. if symbol is pilot, do channel estimation from fft_buffer_.FFT_outputs to csi_buffer_ if symbol is data, copy data from fft_buffer_.FFT_outputs to data_buffer_ and do block transpose
  4. add an event to the message queue to infrom main thread the completion of this task

Reimplemented from Doer.

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PartialTranspose()

void DoFFT::PartialTranspose	(	complex_float *	out_buf,
		size_t	ant_id,
		SymbolType	symbol_type
	)		const

Fill-in the partial transpose of the computed FFT for this antenna into out_buf.

The fully-transposed matrix after FFT is a subcarriers x antennas matrix that should look like so (using the notation subcarrier/antenna, and assuming kTransposeBlockSize = 16)

0/0, 0/1, ........................................................., 0/63 1/0, 0/1, ........................................................ , 1/63 ... 15/0, 15/1, ......................................................, 15/63 ... 1199/0, 1199/1, ............................................... , 1199/63

The partially-tranposed matrix looks like so: 0/0 1/0 ... 15/0 0/1 1/1 ... 15/1 .................... 0/3 1/3 .... 15/3 0/4 1/4 ... 15/4 0/5 1/5 ... 15/5 .................... 0/7 1/5 .... 15/7 ... ...........................................................0/63 ... 15/63 <end of partial transpose block> 16/0 17/0 ... 31/0 ....................................16/3 17/3 ... 31/3 16/4 17/4 ... 31/4 ....................................16/7 17/7 ... 31/7

Each partially-transposed block is identical to the corresponding block of the fully-transposed matrix, but laid out in memory in column-major order.

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Member Data Documentation

calib_dl_buffer_

Table<complex_float>& DoFFT::calib_dl_buffer_

private

calib_ul_buffer_

Table<complex_float>& DoFFT::calib_ul_buffer_

private

csi_buffers_

PtrGrid<kFrameWnd, kMaxUEs, complex_float>& DoFFT::csi_buffers_

private

data_buffer_

Table<complex_float>& DoFFT::data_buffer_

private

duration_stat_csi_

DurationStat* DoFFT::duration_stat_csi_

private

duration_stat_fft_

DurationStat* DoFFT::duration_stat_fft_

private

fft_inout_

complex_float* DoFFT::fft_inout_

private

fft_shift_tmp_

complex_float* DoFFT::fft_shift_tmp_

private

mkl_handle_

DFTI_DESCRIPTOR_HANDLE DoFFT::mkl_handle_

private

phy_stats_

PhyStats* DoFFT::phy_stats_

private

rx_samps_tmp_

std::complex<float>* DoFFT::rx_samps_tmp_

private

temp_16bits_iq_

uint16_t* DoFFT::temp_16bits_iq_

private

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

• src/agora/dofft.h
• src/agora/dofft.cc