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LimeSDR Family » History » Version 6

ahuemer, 10/10/2017 06:45 PM

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