root/ResearchApps/PHY/WARPLAB/WARPLAB_SISO/M_code/warplab_example_TxRx_WorkshopExercise_Solution.m

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Transmitting and Receiving Data using Warplab
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% In this lab exercise you will write a matlab script to transmit and
% receive data using Warplab. 

% Using Warplab, transmission and reception of a signal over a wireless
% channel can be done by following the next six steps:

% 0. Initializaton and definition of parameters
% 1. Generate a vector of samples to transmit and send the samples to the 
% Warp board (Sample Frequency is 40MHz)
% 2. Prepare boards for transmission and reception and send trigger to 
% start transmission and reception (trigger is the SYNC packet)
% 3. Read the received samples from the Warp board
% 4. Reset and disable the boards
% 5. Plot the transmitted and received data (Optional)

% In this lab exercise you will write a matlab script that implements the
% six steps above. Part of the code is provided, some part of the code you
% will write. Read the code below and fill in with your code wherever you 
% are asked to do so.

% NOTE: To avoid conflict with other groups using the boards, please test 
% the code you write in this script in any of the following three ways:
%
% Option 1. Run this script from matlab's Command Window by entering the 
% name of the script (enter warplab_example_TxRx_WorkshopExercise in 
% matlab's Command Window).
% Option 2. In the menu bar go to Debug and select Run. If there
% are errors in the code, error messages will appear in the Command Window.
% Option 3. Press F5. If the are errors in the code, error messages will 
% appear in the Command Window.
%
% DO NOT USE the Evaluate selection option and DO NOT run the script by
% sections. To test any change, always run the whole script by following 
% any of the three options above.

try,
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Code to avoid conflict between users, only needed for the workshop, go to
% step 0 below to start the initialization and definition of parameters
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
fid = fopen('c:\boards_lock.txt');

if(fid > -1)
    fclose('all');
        errordlg('Boards already in use - Please try again!');
        return;
end

!echo > c:\boards_lock.txt

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% 0. Initializaton and definition of parameters
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%Load some global definitions (packet types, etc.)
warplab_siso_defines

% Create Socket handles and intialize nodes
[socketHandles, packetNum] = warplab_initialize;

%Separate the socket handles for easier access
% The first socket handle is always the magic SYNC
% The rest can be arranged in any combination of Tx and Rx
udp_Sync = socketHandles(1);
udp_Tx = socketHandles(2);
udp_RxA = socketHandles(3);

%-------------------------------------------------------------------------%
% USER CODE HERE

% Create the following variables and assign them valid values: 
% CaptOffset: Value of the Capture offset. In [0:2^14]
% TxLength: Number of samples to transmit. In [0:2^14-CaptOffset] 
% TxGainBB: Transmitter BaseBand gain. In [0:3] 
% TxGainRF: Transmitter RF gain. In [0:63]
% RxGainBB: Receiver Baseband gain. In[0:31]
% RxGainRF: Receiver RF gain. In [1:3]
% CarrierChannel: Channel in the 2.4 GHz band. In [1:14]

% Note: Set TxGainBB, TxGainRF, RxGainBB, and RxGainRF to the same values 
% you used in the warplab_siso_GUI.

% Define the warplab options (parameters)
CaptOffset = 1000; %Number of noise samples per Rx capture; in [0:2^14]
TxLength = 2^14-1000; %Length of transmission; in [0:2^14-CaptOffset]
TxGainBB = 3; %Tx Baseband Gain in [0:3]
TxGainRF = 40; %Tx RF Gain in [0:63]
RxGainBB = 18; %Rx Baseband Gain in [0:31]
RxGainRF = 1; %Rx RF Gain in [1:3]
CarrierChannel = 11; % Channel in the 2.4 GHz band. In [1:14]

%-------------------------------------------------------------------------%
    
% Define the options vector; the order of options is set by the FPGA's code
% (C code)
optionsVector = [CaptOffset TxLength-1 (RxGainBB + RxGainRF*2^16) (TxGainRF + TxGainBB*2^16) CarrierChannel]; 
% Send options vector to the nodes
warplab_setOptions(socketHandles,optionsVector);

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% 1. Generate a vector of samples to transmit and send the samples to the 
% Warp board (Sample Frequency is 40MHz)
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%Create time vector 't'
t = 0:(1/40e6):TxLength/40e6 - 1/40e6; 

%-------------------------------------------------------------------------%
% USER CODE HERE

% Create a signal to transmit (a vector of samples to transmit). 
% The signal must be a row vector. The Signal is a function of the time 
% vector 't'. The signal can be real or complex, the only constraint is
% that the amplitude of the real part must be in [-1:1] and the amplitude 
% of the imaginary part must be in [-1:1]. Store the signal to transmit in 
% a variable called TxData (TxData = your signal)

TxData = exp(t*j*2*pi*1e6); % Create a signal to transmit. Signal must be a
% row vector. The signal can be real or complex, the only constraint is
% that the amplitude of the real part must be in [-1:1] and the amplitude 
% of the imaginary part must be in [-1:1]
%-------------------------------------------------------------------------%

% Download the samples to be transmitted
warplab_writeSMWO(udp_Tx, TxData, RADIO2_TXDATA);

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% 2. Prepare boards for transmission and reception and send trigger to 
% start transmission and reception (trigger is the SYNC packet)
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Enable transmission
warplab_enableTx(udp_Tx);

% Enable reception
warplab_enableRx(udp_RxA);

% Send the SYNC packet
warplab_sendSync(udp_Sync);

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% 3. Read the received samples from the Warp board
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Read back the received samples
[RawRxData] = warplab_readSMRO(udp_RxA, RADIO2_RXDATA, TxLength+CaptOffset);
% Process the received samples to obtain meaningful data
[RxData,RxOTR] = warplab_processRawRxData(RawRxData);
% Read stored RSSI data
[RawRSSIData] = warplab_readSMRO(udp_RxA, RADIO2_RSSIDATA, (TxLength+CaptOffset)/8);
% Procecss Raw RSSI data to obtain meningful RSSI values
[RxRSSI] = warplab_processRawRSSIData(RawRSSIData);

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% 4. Reset and disable the boards
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Reset the receiver
warplab_sendCmd(udp_RxA, RX_DONEREADING, packetNum);

% Disable the receiver
warplab_sendCmd(udp_RxA, RADIO2_RXDIS, packetNum);

% Disable the transmitter
warplab_sendCmd(udp_Tx, RADIO2_TXDIS, packetNum);

% Close sockets
pnet('closeall');


%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% 5. Plot the transmitted and received data
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
figure;
subplot(2,2,1);
plot(real(TxData));
title('Tx I');
xlabel('n (samples)'); ylabel('Amplitude');
axis([0 2^14 -1 1]); % Set axis ranges.
subplot(2,2,2);
plot(imag(TxData));
title('Tx Q');
xlabel('n (samples)'); ylabel('Amplitude');
axis([0 2^14 -1 1]); % Set axis ranges.
subplot(2,2,3);
plot(real(RxData));
title('Rx I');
xlabel('n (samples)'); ylabel('Amplitude');
axis([0 2^14 -1 1]); % Set axis ranges.
subplot(2,2,4);
plot(imag(RxData));
title('Rx Q');
xlabel('n (samples)'); ylabel('Amplitude');
axis([0 2^14 -1 1]); % Set axis ranges.

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Code to avoid conflict between users, only needed for the workshop
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
pnet('closeall');
!del c:\boards_lock.txt
catch,
% Close sockets
pnet('closeall');
!del c:\boards_lock.txt
lasterr
end