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ptrkrysik, 09/06/2018 09:18 AM
SDR Phy vs Calypso

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h1. Welcome to [[SDR PHY for OsmocomBB]] project
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h2. Introduction
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[[OsmocomBB:]] project provides almost free software GSM mobile station implementation, from Layer 1 to Layer 3. The last non-free parts are: layer 1 and low level signal processing that are implemented in a non-free DSP software which is inside of the hardware platform that [[OsmocomBB:]] is currently based on (mainly reverse engineered [[OsmocomBB:TI_Calypso_Chipset|Calypso]] based mobile phones).
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The [[SDR PHY for OsmocomBB]] aims to replace these non-free parts through use Software Defined Radio devices and by creating missing software part for tasks such as scheduling, voice encoding/decoding, channel encoding/decoding, burst modulation/demodulation and controlling SDR hardware. In order to achieve this goal the [[SDR PHY for OsmocomBB]] brings together [[OsmocomBB:]] and [[gr-gsm:]] projects, where the role of [[gr-gsm:]] is to provide GSM bursts transmission and reception with everything starting from channel coding/decoding being done in [[OsmocomBB:]].
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Having support for general purpose SDR hardware has additional advantage of not being locked to a single and already obsolete hardware platform. Adding support for a new well documented SDR platform is significantly easier than reverse-engineering mobile phone's hardware and software. This could sustain [[OsmocomBB:]] project's life even in the absence of hacked mobile phones it is able to run on.
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A detailed comparison of [[OsmocomBB:TI_Calypso_Chipset|Calypso]] based and SDR based approaches can be found on [[SDR PHY vs Calypso]] subpage.
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h2. Project status
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Known limitations (not implemented):
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* Automatic PHY delay measurement
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* AGC (Automatic Gain Control)
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* Power measurement
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Work in progress:
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* Docker scripts (Dockerfiles)
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* GAPK based audio back-end
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* TCH/H implementation
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* Frequency Hopping
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Future plans:
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* Extend supported hardware list (Soapy?)
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* PC/SC physical SIM interface
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* AMR (Adaptive Multi-Rate)
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h2. Sponsors
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The "project":https://nlnet.nl/project/sdr-phy/ has support of NLnet Foundation
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!https://osmocom.org/attachments/download/3315/nlnet_logo_320x120.png(fsdafs)!:https://nlnet.nl.
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