comm.SDRRxE3xx
Receive data from USRP E3xx radio hardware
Add-On Required: This feature requires the Communications Toolbox Support Package for USRP Embedded Series Radio add-on.
Description
The comm.SDRRxE3xx
System object™ receives data from a USRP™ E3xx radio hardware.
The object supports these radio hardware devices:
USRP E310
USRP E312
You can use the comm.SDRRxE3xx
System object to simulate and develop various software-defined radio (SDR) applications. This
diagram shows the conceptual overview of transmitting and receiving radio signals in
MATLAB® using the Communications Toolbox™ Support Package for USRP Embedded Series Radio. MATLAB interacts with the comm.SDRRxE3xx
receiver System object to receive data from the radio hardware.
To receive data from the E3xx radio hardware:
Create the
comm.SDRRxE3xx
object and set its properties.Call the object as if it were a function.
To learn more about how System objects work, see What Are System Objects?.
Creation
To create a comm.SDRRxE3xx
System object, use the sdrrx
function with input
argument 'E3xx'
. For example:
rx = sdrrx('E3xx')
To create the object with properties set to specific values, call the function using one or more name-value arguments. For example:
rx = sdrrx('E3xx', ... 'IPAddress','192.168.3.2', ... 'CenterFrequency',2.2e9, ... 'BasebandSampleRate',800e3)
Properties
The comm.SDRRxE3xx
receiver System object supports up to two channels to receive data from the E3xx radio hardware. Use
the ChannelMapping
property to indicate whether to use a single
channel or both channels. For each channel, you can set the Gain
property independently, or you can apply the same setting to
both channels. All other property values are applied to each channel in use.
Unless otherwise indicated, properties are nontunable, which means you cannot change their
values after calling the object. Objects lock when you call them, and the
release
function unlocks them.
If a property is tunable, you can change its value at any time.
For more information on changing property values, see System Design in MATLAB Using System Objects.
Main PropertiesIPAddress
— IP address of radio hardware
'192.168.3.2'
(default) | dotted-quad character vector
IP address of the radio hardware, specified as a dotted-quad character vector. This value must
match the physical IP address of the radio hardware assigned during hardware setup. For more
information, see Guided Host-Radio Hardware Setup. If you configure the radio hardware with an
IP address other than the default, update the IPAddress
accordingly.
Data Types: char
| string
CenterFrequency
— RF center frequency in Hz
2400000000
(default) | nonnegative finite scalar
RF center frequency in Hz, specified as a nonnegative finite scalar. The valid range for center frequency is 70 MHz to 6 GHz.
Tunable: Yes
Data Types: double
ChannelMapping
— Channel output mapping
1
(default) | 2
| [1 2]
Channel output mapping, specified as one of these values:
1
— Only channel 1 is in use.2
— Only channel 2 is in use.[1 2]
— Both channels are in use.
GainSource
— Source of gain
'AGC Slow
Attack'
(default) | 'AGC Fast Attack'
| 'Manual'
Source of gain, specified as one of these values:
'AGC Slow Attack'
— For signals with slowly changing power levels.'AGC Fast Attack'
— For signals with rapidly changing power levels.'Manual'
— Specify the gain by using theGain
property.
Data Types: char
| string
Gain
— Gain in dB
1
(default) | numeric scalar | 1-by-2 vector
Gain in dB, specified as a numeric scalar or a 1-by-2 vector. The valid gain range is –10 dB to 73 dB and depends on the center frequency. An incompatible gain and center frequency combination returns an error from the radio hardware. For the acceptable minimum and maximum gain values per center frequency, check the manufacturer's specification.
Set the value of gain based on the ChannelMapping
property:
For a single channel, specify the gain as a scalar.
For two channels that use the same gain value, specify the gain as a scalar. The object applies the gain by scalar expansion.
For two channels that use different gain values, specify the values as a 1-by-2 vector. The ith element of the vector is applied to the ith channel specified by the
ChannelMapping
property.
Tunable: Yes
Dependencies
To enable this property, set GainSource
to 'Manual'
.
Data Types: double
BasebandSampleRate
— Baseband sampling rate in Hz
1000000
(default) | positive scalar
Baseband sampling rate in Hz, specified as a positive scalar. The valid range of this property is 520.834 kHz to 30.72 MHz.
Note
To synchronize the comm.SDRRxE3xx
System object with the radio hardware, call the info
function on the object. If the specified
and actual rates have a small mismatch, verify that the computed
rate is close to the value you actually want.
Data Types: double
OutputDataType
— Complex data type of output signal
'int16'
(default) | 'single'
| 'double'
Complex data type of the output signal, specified as one of these values:
'int16'
— Integer values are the raw 16-bit I and Q samples from the board. The 12-bit value from the ADC of the AD9361 RF chip is sign-extended to 16 bits.'single'
— Single-precision floating point values are scaled to the range of [–1, 1]. The object derives this value from the sign-extended 16 bits received from the board.'double'
— Double-precision floating point values are scaled to the range of [–1, 1]. The object derives this value from the sign-extended 16 bits received from the board.
SamplesPerFrame
— Number of samples per frame
20000
(default) | positive integer
Number of samples per frame, specified as a positive integer. In single-channel
mode, the number of samples per frame must be even. When streaming to the host, using
large frame sizes can give more efficient performance. To determine real-time execution
of the object, use the overflow
output argument.
Data Types: double
EnableBurstMode
— Option for burst mode
false
(default) | true
Option for burst mode, specified as false
or
true
. When set to true
, this property produces a
set of contiguous samples without overflow. This setting can help simulate models that
cannot run in real time. When you enable burst mode, specify the amount of contiguous
data using the NumFramesInBurst
property. For more information on
how to use this property, see Burst Mode.
Data Types: logical
NumFramesInBurst
— Number of frames in contiguous burst
1
(default) | positive integer
Number of frames in a contiguous burst, specified as a positive integer.
Dependencies
To enable this property, set
EnableBurstMode
to true
.
Data Types: double
UseCustomFilter
— Use custom filter
false
(default) | true
Use custom filter, specified as one of these values:
false
— The filter chain uses the default filter design.true
— The filter chain uses a custom filter design. For example, if the gain or bandwidth characteristics of the default filter does not satisfy the requirements for your application, you can design a custom filter that meets your specific requirements. To design a custom filter, call thedesignCustomFilter
function.
Note
When applying a custom filter to a comm.SDRRxE3xx
System object, the UseCustomFilter
property is automatically set to true
. To switch between the default and your custom filter, set the UseCustomFilter
property to false
or true
, respectively.
For more information, see Baseband Sampling Rate and Filter Chains.
Data Types: logical
ShowAdvancedProperties
— Enable advanced properties
false
(default) | true
Enable advanced properties, specified as false
or
true
.
When you set this property to true
, these advanced properties are
enabled.
Data Types: logical
BypassUserLogic
— Option for bypassing user logic
false
(default) | true
Option for bypassing user logic, specified as false
or
true
. When the property is true
, the radio
hardware data path bypasses the algorithm generated and programmed during FPGA targeting
or hardware-software co-design. For more information, see FPGA Targeting Workflow
and Hardware-Software Co-Design Workflow.
Dependencies
To enable this property, set ShowAdvancedProperties
to true
.
Data Types: logical
EnableQuadratureCorrection
— Quadrature correction
true
(default) | false
Quadrature correction, specified as true
or
false
. When this property is true
, the object
applies in-phase and quadrature (IQ) imbalance compensation.
Dependencies
To enable this property, set ShowAdvancedProperties
to true
.
Data Types: logical
EnableRFDCCorrection
— RF DC correction
true
(default) | false
RF direct current (DC) correction, specified as true
or
false
. When this property is true
, the object
applies an RF DC blocking filter.
Dependencies
To enable this property, set ShowAdvancedProperties
to true
.
Data Types: logical
EnableBasebandDCCorrection
— Baseband DC correction
true
(default) | false
Baseband DC correction, specified as true
or
false
. When this property is true
, the object
applies a baseband DC blocking filter.
Dependencies
To enable this property, set ShowAdvancedProperties
to true
.
Data Types: logical
DataTimeout
— Timeout for I/O operations in seconds
Inf
(default) | nonnegative scalar
Timeout for I/O operations in seconds, specified as one of these options:
Inf
— The object waits indefinitely to complete I/O operations.Nonnegative scalar, N — The object waits N seconds to complete I/O operations. Zero seconds corresponds to a non-blocking setup.
Dependencies
To enable this property, set ShowAdvancedProperties
to true
.
Data Types: double
BISTLoopbackMode
— Built-in self-test (BIST) loopback mode
'Disabled'
(default) | 'Digital Tx -> Digital Rx'
| 'RF Rx -> RF Tx'
Built-in self-test loopback mode, specified as one of these options:
'Disabled'
— Disable BIST loopback.'Digital Tx -> Digital Rx'
— Enable digital signals to loop back within the device. The signals bypass the RF stage.'RF Rx -> RF Tx'
— Enable incoming receiver RF signals to loop back to the RF transmitter port. The signals bypass the FPGA.
Dependencies
To enable this property, set ShowAdvancedProperties
to true
.
Data Types: char
| string
BISTToneInject
— BIST signal injection mode
'Disabled'
(default) | 'Tone Inject Tx'
| 'Tone Inject Rx'
BIST signal injection mode, specified as one of these options:
'Disabled'
— Disable BIST signal injection.'Tone Inject Tx'
— Enable BIST signal injection to the transmit path.'Tone Inject Rx'
— Enable BIST signal injection to the receive path.
When you enable BIST signal
injection, you can set the source of BIST signal
generation with the
BISTSignalGen
property.
Dependencies
To enable this property, set ShowAdvancedProperties
to
true
.
Data Types: char
| string
BISTSignalGen
— Source of BIST signal generation
'PRBS'
(default) | 'Tone'
Source of BIST signal generation, specified as one of these options:
'PRBS'
— Use the pseudo random binary sequence (PRBS) generator of the board.'Tone'
— Use the tone generator of the board. To set the tone frequency and tone level, use theBISTToneFreq
andBISTToneLevel
properties, respectively.
Dependencies
To enable this property, set BISTToneInject
to 'Tone Inject Tx'
or
'Tone Inject Rx'
.
Data Types: char
| string
BISTToneFreq
— BIST tone frequency
'Fs/32'
(default) | 'Fs/16'
| 'Fs*3/32'
| 'Fs/8'
BIST tone frequency, specified as 'Fs/32'
, 'Fs/16'
,
'Fs*3/32'
, or 'Fs/8'
.
Dependencies
To enable this property, set BISTSignalGen
to 'Tone'
.
Data Types: char
| string
BISTToneLevel
— BIST tone level
'0'
(default) | '-6'
| '-12'
| '-18'
BIST tone level, specified as '0'
, '-6'
,
'-12'
, or '-18'
.
Dependencies
To enable this property, set BISTSignalGen
to
'Tone'
.
Data Types: char
| string
Usage
Description
[
returns data received from the radio hardware associated with the
data
,validData
,overflow
]
= rx()comm.SDRRxE3xx
receiver System object
rx
. The output validData
indicates whether the
object has received data from the radio hardware. The output overflow
indicates data discontinuity. If overflow
is true
,
then data
does not represent contiguous data. The first valid data
frame can contain transient values, resulting in packets containing undefined data.
Output Arguments
data
— Output signal
complex matrix
Output signal received from the radio hardware, returned as a complex matrix. The
number of columns in the matrix depends on the number of channels in use, as specified
by the ChannelMapping
property. Each column corresponds to a channel of complex data received on one
channel.
The output signal supports complex values with these data types:
16-bit signed integers — Complex values are the raw 16-bit I and Q samples from the board. The 12-bit value from the ADC of the AD9361 RF chip is sign-extended to 16 bits.
Single-precision floating point — Complex values are scaled to the range of [–1, 1]. The object derives this value from the sign-extended 16 bits received from the board.
Double-precision floating point — Complex values are scaled to the range of [–1, 1]. The object derives this value from the sign-extended 16 bits received from the board.
To specify the base type, use the OutputDataType
property.
Data Types: int16
| single
| double
Complex Number Support: Yes
validData
— Valid data indicator
logical scalar
Valid data indicator, returned as a logical scalar.
true
indicates thatrx
has received data from the radio hardware.false
indicates thatrx
has not received data from the radio hardware.
When the DataTimeout
property is set to Inf
, the output
validData
is always true
. In this case, the
object waits indefinitely until data reception. To qualify data validity, set
DataTimeout
to a value other than
Inf
.
overflow
— Data discontinuity flag
logical scalar
Data discontinuity flag, returned as a logical scalar.
true
indicates the presence of overflow resulting in noncontiguous data.false
indicates no overflow.
You can use this value as a diagnostic tool to determine real-time execution of the object.
Object Functions
To use an object function, specify the
System object as the first input argument. For
example, to release system resources of a System object named obj
, use
this syntax:
release(obj)
Specific to comm.SDRRxE3xx
designCustomFilter | Design custom filter for Analog Devices AD9361 RF chip |
info | Synchronize receiver or transmitter radio settings with radio hardware |
Examples
Receive Data from USRP E3xx Radio Hardware
Make sure your radio hardware is configured for host-radio communication by following the steps in Guided Host-Radio Hardware Setup.
Create a receiver System object for your radio hardware with the specified properties. Use a single channel.
rx = sdrrx('E3xx', ... 'IPAddress','192.168.3.2', ... 'CenterFrequency',2.2e9, ... 'BasebandSampleRate',800e3, ... 'ChannelMapping',1)
rx = comm.SDRRxE3xx with properties: Main DeviceName: 'E3xx' IPAddress: '192.168.3.2' CenterFrequency: 2.2000e+09 GainSource: 'AGC Slow Attack' ChannelMapping: 1 BasebandSampleRate: 800000 OutputDataType: 'int16' SamplesPerFrame: 20000 EnableBurstMode: false ShowAdvancedProperties: false Show all properties
Create a log for recording data.
Log = dsp.SignalSink;
Receive and validate data by using the receiver System object. Save valid data using the log.
for counter = 1:20 [data,validData,overflow] = rx(); if validData == 1 if overflow ~=1 % contiguous data Log(data); end else disp('Not valid data.'); end end
## Establishing connection to hardware. This process can take several seconds.
Version History
Introduced in R2019b
See Also
Functions
Blocks
Objects
Topics
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