chest=====Channel knowledge is necessary for the detection of symbols in a MIMOreceiver. Knowledge of channel is gained by sending a known trainingsequence. This traininig sequence satisfies certain desired propertiesas given by 1) Jaiganesh Balakrishnan, Markus Rupp, Harish Viswanthan'Optimal Training for Multiple Antenna Systems' 2)C.Fragouli, N. Al-Dhahir,W. Turin 'Training based channel estimation for Multiple Antenna BrodbandTransmissions'. Please refer to them for more technical details.chest_rcv--------- Using the midamble the channel is estimated for the given antenna. This module also removes the midamble part of the data stream.Inputs:	SYMBOL_COMPLEXoutputs:	SYMBOL_COMPLEXConfig:	align<int>: 0		0-> don't move the signal		else align output to the strongest tap of channel "align"		if calc_taps > 0, then align means that the number of taps calculated		are 'around' the peak of the channel impulse response.	calc_taps<int>: 0		How many taps shall be used in the channel equalisation. If you		want to use the signal for some decoding, this is best left to		0 (which means the signal won't be altered and you only get a channel		estimation). If there is some hard-decision, put it to 1 or more	circ_ext<int>: 8		The length of the circular extension	index<int>: 0		The midamble-index for this chest	num_of_antennas<int>: 1		Necessary for noise variance estimation, represnts no. Tx antennas	type<int>: 0		0-> MCCDMA, 1 -> FraStats:	ch_length<int>:		The length of the channel impulse response	channel<block_t>:		The channel of all N received antennas	channel_inv<block_t>:		The inversed channel	mid_amp<int>:		mean midamble-amplitude	midamble<block_t>:		The midamble	noise_var<int>:		The general noise variance = Realpart+Imagpart	noise_var_imag<int>:		Imag part	noise_var_real<int>:		Real part	peak_amp<int>:		peak-amplitude of the midamble	peak_pos<int>:		The peak of the midamble	snr<double>:		The SNR in dbchest_rcv_mimo-------------- Using the midamble the channel is estimated for the given antenna. This modulealso removes the midamble part of the data stream. It does assume that there are a maximum of training_seq[].M senders, and that each sender has an increasing index. This means that a sender has at mosttraining_seq[].L channel taps. Each output corresponds to one sender. So, if you want to receive sender #2,connect to output #2Inputs:	SYMBOL_COMPLEXoutputs:	SYMBOL_COMPLEXConfig:	align<int>: 1		0-> don't move the signal		else align output to the strongest tap of channel "align"		if calc_taps > 0, then align means that the number of taps calculated		are 'around' the peak of the channel impulse response.	calc_taps<int>: 4		How many taps shall be used in the channel equalisation. If you		want to use the signal for some decoding, this is best left to		0 (which means the signal won't be altered and you only get a channel		estimation). If there is some hard-decision, put it to 1 or more	circ_ext<int>: 8		The length of the circular extension	num_of_antennas<int>: 1		Necessary for noise variance estimation, represnts no. Tx antennas	type<int>: 0		0-> MCCDMA, 1 -> FraStats:	ch_length<int>:		The length of the channel impulse response	channel<block_t>:		The channel of all N received antennas	channel_inv<block_t>:		The inversed channel	mid_amp<int>:		mean midamble-amplitude	midamble<block_t>:		The midamble	noise_var<int>:		The general noise variance = Realpart+Imagpart	noise_var_imag<int>:		Imag part	noise_var_real<int>:		Real part	peak_amp<int>:		peak-amplitude of the midamble	peak_pos<int>:		The peak of the midamble	snr<double>:		The SNR in dbchest_rcv_mimo_ics------------------  Mimo Channel Estimation is done in the module  Also the Midambles are removedInputs:	SYMBOL_COMPLEXoutputs:	SYMBOL_COMPLEXConfig:	align<int>: 0		0-> don't move the signal		else align output to the strongest tap of channel "align"		if calc_taps > 0, then align means that the number of taps calculated		are 'around' the peak of the channel impulse response.	calc_taps<int>: 0		How many taps shall be used in the channel equalisation. If you		want to use the signal for some decoding, this is best left to		0 (which means the signal won't be altered and you only get a channel		estimation). If there is some hard-decision, put it to 1 or more	circ_ext<int>: 8		The length of the circular extension	index<int>: 0		The midamble-index for this chest	num_of_antennas<int>: undef		Necessary for noise variance estimation, represnts no. Tx antennas	type<int>: undef		0-> MCCDMA, 1 -> FraStats:	ch_length<int>:		The length of the channel impulse response	channel<block_t>:		The channel of all N received antennas	channel_inv<block_t>:		The inversed channel	mid_amp<int>:		mean midamble-amplitude	midamble<block_t>:		The midamble	noise_var<int>:		The general noise variance = Realpart+Imagpart	noise_var_imag<int>:		Imag part	noise_var_real<int>:		Real part	peak_amp<int>:		peak-amplitude of the midamble	peak_pos<int>:		The peak of the midamble	snr<double>:		The SNR in db	transfer_matrix<block_t>:		The peaks corresponding to the NO_RX channelschest_send----------Midamble insertion module, MIMO incorporated!Inputs:	SYMBOL_COMPLEXoutputs:	SYMBOL_COMPLEXConfig:	amplitude<int>: 32767		The amplitude of the midamble	circ_ext<int>: 8		How many samples for the circular extension	index<int>: 0		Antenna index	type<int>: 0		The type of the midamble inserted:		0-> MCCDMA		1-> Fra