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Building a high throughput low-latency PCIe based SDR

Alexander Chemeris, Sergey Kostanbaev

We've been working with SDRs since 2008 and building own SDRs since 2011, focusing on embedded systems and mobile base stations. We created ClockTamer configurable clock source and UmTRX SDR and built a complete base station (UmSITE) to run OpenBTS and later Osmocom GSM stacks. This year we've started working on a new tiny high-performance SDR called XTRX which fits into the miniPCIe form-factor and using PCIe for the I/Q samples transfer. We will talk about when to use PCIe and when not to use PCIe and why did we choose it for XTRX; FPGA implementation of PCIe with optimization for low latency and high throughput; Linux kernel driver for this PCIe device; integration with various SDR platforms; all the various issues we encountered and how you can avoid them.

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