mimo::FadingMIMOChannel Class Reference

DEPRECATED. MIMOChannel for statistical fading model. More...

#include <fadingmimochannel.h>

Inheritance diagram for mimo::FadingMIMOChannel:

[legend]List of all members.


Public Member Functions
	FadingMIMOChannel (int deviceID, DeviceSystemIntf *system, const simth::PropertyList &pl)
	constructor
virtual	~FadingMIMOChannel ()
	destructor
virtual void	refresh ()
	determines new random transfer factors
void	getTransfer (int relative_time, MatrixFreqSignal &trans) const
void	transmit (const VectorTimeSignal &sym, VectorTimeSignal &outsym)
	transmits a symbol sequence over the channel
virtual void	print (std::ostream &os) const
Protected Attributes
double	sigma
	scale factor sigma of rayleigh distribution
RayleighRng	ray
	pointer to a Rayleigh distributed random variable
double	normFactor
	Stores the normalization factor.
simthlib::OfdmReceiver *	ofdm_recv
simthlib::OfdmTransmitter *	ofdm_trans
unsigned	num_carrier
double	carrier_dist
unsigned	maxantenna
std::vector< TimeSignal::storage_type * >	time_samples
std::vector< ModSeq * >	freq_samples
CVectorSeq::storage_type	freq_vectors_in
CVectorSeq::storage_type	freq_vectors_out

Detailed Description

DEPRECATED. MIMOChannel for statistical fading model.

DEPRECATED. This specific class has Rayleigh Fading in the amplitude, but zero phase rotation. For the usual Gaussian fading you will probably prefer to use CmplFadingChannel. Therefore this class is deprecated and should not be used.

This channel and its derived classes can either be used as a flat-fading/narrowband channel, or as a broadband Rayleigh fading channel.

For a flat-fading/narrowband channel, at each refresh() one new transfer factor $H_0$ is diced. The channel transfer function then is constant over all frequency, $H(f)=H_0$ , and the channel impulse response is simply a multiplication with this one transfer factor. This mode of operation is chosen by specifying the Property num_carrier to be one (default).

Alternatively, this channel and its derived classes can be used as a broadband Rayleigh fading channel, so that for a specific OFDM system each subcarrier will undergo an i.i.d. fading. However, this requires this block to know the parameters of the surrounding OFDM system exactly. Hence, the Properties num_carrier, oversampling, carrier_dist, and guard_time have to be specified identically to the OFDM transmitter/receiver blocks. In this mode of operation, at each refresh() a new channel transfer function is diced with $K$ =num_carrier different i.i.d. random variables $H_k$ at each subcarrier k, resulting in $H(f_k)=H_k, k=0,\ldots,K-1$ where each $f_k$ is the frequency of subcarrier k.

Constructor & Destructor Documentation

mimo::FadingMIMOChannel::FadingMIMOChannel ( int deviceID,

DeviceSystemIntf * system,

const simth::PropertyList & pl

)

constructor

virtual mimo::FadingMIMOChannel::~FadingMIMOChannel ( ) [virtual]

destructor

Member Function Documentation

virtual void mimo::FadingMIMOChannel::refresh ( ) [virtual]

determines new random transfer factors

Reimplemented from simth::Device.
Reimplemented in mimo::CmplFadingMIMOChannel, and mimo::FileFadingChannel.

void mimo::FadingMIMOChannel::getTransfer ( int relative_time,

MatrixFreqSignal & trans

) const [virtual]

Determines channel transfer factors. An ideal estimation of the channel transfer function is performed. This means, the exact values $H(f_i,t_0)$ are determined, where $t_0$ is ${\tt time} * {\tt delta\_t}$ and $f_i = n\cdot \mbox{\tt delta\_f}, n=0, \dots, \mbox{\tt num\_f}-1$ . (time = 0 indicates the transmission time of the sample transmitted at last over the channel; time = -numSamples indicates the transmission time of the first sample of the last transmitted sequence.
Implements mimo::MIMOChannel.

void mimo::FadingMIMOChannel::transmit ( const VectorTimeSignal & sym,

VectorTimeSignal & outsym

) [virtual]

transmits a symbol sequence over the channel

Implements mimo::MIMOChannel.

virtual void mimo::FadingMIMOChannel::print ( std::ostream & os ) const [virtual]

Reimplemented from mimo::MIMOChannel.
Reimplemented in mimo::CmplFadingMIMOChannel.