软件无线电USRP N210+MATLAB+pem009 MATLAB示例

	clear all;
	%% usrp必备，用来检测usrp连接成功，并对平台名称什么的赋值
	connectedRadios = findsdru;
	if strncmp(connectedRadios(1).Status, 'Success', 7)
	  radioFound = true;
	  platform = connectedRadios(1).Platform;
	  switch connectedRadios(1).Platform
		case {'B200','B210'}
		  address = connectedRadios(1).SerialNum;
		case {'N200/N210/USRP2','X300','X310'}
		  address = connectedRadios(1).IPAddress;
	  end
	else
	  radioFound = false;
	  address = '192.168.10.2';
	  platform = 'N200/N210/USRP2';
	end
	%% 对发射器接收器进行定义赋值

	% rfTxFreq = 2.48e9 ;
	rfTxFreq = 467.6625e6;
	rfRxFreq = 467.6625e6; % RF Receiver Center Frequency (Hz)
	% rfRxFreq = 2.48e9 ;
	rfRxFreqCorrection = -4e3; % Frequency calibration compensation value (Hz)
	rfRxFreqActual = rfRxFreq + rfRxFreqCorrection;
	txRadioGain = 5;
	rxRadioGain = 15;
	rxRadioDecimationFactor = 500;
	rxRadioFrameLength = 4000;


	 radioTx = comm.SDRuTransmitter('Platform', platform, ...
			'IPAddress', address, ...
			'CenterFrequency', rfTxFreq,...
			'Gain', txRadioGain);
		
	 radioRx = comm.SDRuReceiver('Platform', platform, ...
			'IPAddress', address, ...
			'CenterFrequency', rfRxFreq,...
			'Gain', rxRadioGain, ...
			'DecimationFactor', rxRadioDecimationFactor, ...
			'SamplesPerFrame', rxRadioFrameLength, ...
			'OutputDataType', 'single');
		


		%% 显示频域范围内的频率强度图显示函数；显示时域信号的波形，本脚本选的是一个正弦波。
		
		
		hSpectrumAnalyzer = dsp.SpectrumAnalyzer(...
		'Name',                'Frequency of the Sine waveform sent out',...
		'Title',               'Frequency of the Sine waveform sent out',...
		'SampleRate',           200e3, ...  
		'YLimits',              [-150,30],...
		'SpectralAverages',     50, ...
		'FrequencySpan',        'Start and stop frequencies', ...
		'StartFrequency',       -100e3, ...9
		'StopFrequency',        100e3,...
		'Position',             figposition([50 30 30 40]));



		hTimeScope = dsp.TimeScope(...
		'Name',                'Frequency of the Sine waveform sent out',...
		'Title',               'Frequency of the Sine waveform sent out',...
		'PlotAsMagnitudePhase', false,...
		'SampleRate',           200e3, ...
		'TimeSpan',             0.001,...
		'YLimits',              [-0.2,0.2],...
		'Position',             figposition([50 30 30 40]));


	%% 定义信号源

	hSineSource = dsp.SineWave (...
		'Frequency',           31e3, ...
		'Amplitude',           0.8,...
		'ComplexOutput',      true, ...
		'SampleRate',         200e3, ...
		'SamplesPerFrame',     4000, ...
		'OutputDataType',      'double');



	%% 主函数，循环产生视图


	 if radioFound
		% Loop until the example reaches the target stop time.
		timeCounter = 0;
		
		while timeCounter < 30
		  dataTx = step(hSineSource);  % Generate audio waveform 
	%        step(hTimeScope,dataTx);
		  step(radioTx, dataTx);
			% Receiver stream processing
			% -----------------------------------------------------------------
		  [dataRx, lenRx] = step(radioRx);
		   
		  if lenRx > 0
			  step(hSpectrumAnalyzer, dataRx);
	%           plotspecsb(dataRx,1/200e3);      
			  step(hTimeScope,dataRx);
	%             hTimeScope(dataRx);
		  end
		  
		  timeCounter=timeCounter+0.001;
	   end
	else
		warning(message('sdru:sysobjdemos:MainLoop'))
	 end
	 

	 %% 。。。
	 
	release(radioTx)
	release(radioRx)

	release(hSineSource)

	displayEndOfDemoMessage(mfilename)