LimeSDR Family » History » Revision 5
Revision 4 (laforge, 06/13/2017 06:20 PM) → Revision 5/52 (laforge, 10/10/2017 02:06 AM)
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h1. LimeSDR
The "LimeSDR":https://myriadrf.org/projects/limesdr/ is a low-cost SDR board featuring the Lime Microsystems LMS7002 RF chip.
Key characteristics include:
* RF Transceiver: Lime Microsystems LMS7002M MIMO FPRF
* FPGA: Altera Cyclone IV EP4CE40F23 – also compatible with EP4CE30F23
M* emory: 256 MBytes DDR2 SDRAM
* USB 3.0 controller: Cypress USB 3.0 CYUSB3014-BZXC
* Oscillator: Rakon RPT7050A @ 30.72MHz
* Continuous frequency range: 100 kHz – 3.8 GHz
* Bandwidth: 61.44 MHz
* RF connection: 10 U.FL connectors (6 RX, 4 TX)
* Power Output (CW): up to 10 dBm
* Multiplexing: 2×2 MIMO
* Power: micro USB connector or optional external power supply
* Status indicators: programmable LEDs
* Dimensions: 100 mm x 60 mm
h2. RF Output Power
TBD
h2. Clock
The on-board clock is a 250ppb VCTCXO. GSM strictly requires 30ppb, but 250ppb _should_ be sufficient for laboratory use.
h3. Clock Calibration
TBD
h3. Using external clock reference
TBD
h2. OsmoTRX on LimeSDR
In terms of OsmoTRX support, you will a relatively complex driver stack consisting of:
* "LimeSuite":https://github.com/myriadrf/LimeSuite.git containing the actual drivers and utilities for LimeSDR
* "SoapySDR":https://github.com/pothosware/SoapySDR.git as middleware that wraps LimeSuite
* "SoapyUHD":https://github.com/pothosware/SoapyUHD.git as plug-in exposing SoapySDR devices to UHD
* UHD as the driver interface below OsmoTRX
{{graphviz_link()
digraph G{
rankdir = LR;
LimeSDR -> LimeSuite [label = "USB/libusb"];
LimeSuite -> SoapySDR;
SoapySDR -> UHD [label = "SoapyUHD"];
UHD -> OsmoTRX [label = "libuhd"];
}
}}
You will need to observe the following dependencies when building the above:
# SoapyUHD depends on SoapySDR
# LimeSuite depends on SoapySDR.
h3. Verifying the driver stack
You can ensure that LimeSuite recognizes your device using the *LimeUtil* part of LimeSuite:
<pre>
$ LimeUtil --find 109/0/0
* [LimeSDR-USB, media=USB 3.0, module=STREAM, addr=1d50:6108, serial=0009060B00xxyyzz]
</pre>
You can ensure that SoapySDR and LimeSuite work together as expected using the *SoapySDRUtil* part of SoapySDR:
<pre>
$ ./SoapySDRUtil --find 101/0/0
######################################################
## Soapy SDR -- the SDR abstraction library
######################################################
linux; GNU C++ version 6.3.0 20170221; Boost_106200; UHD_003.009.005-0-unknown
Found device 0
addr = 1d50:6108
driver = lime
label = LimeSDR-USB [USB 3.0] 9060B00462B1C
media = USB 3.0
module = STREAM
name = LimeSDR-USB
serial = 0009060B00xxyyzz
</pre>
