XTRX

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Feb 11, 2017

MIMO and Independent Receive/transmit

We often get asked how many receive and transmit chains does XTRX have and whether you can tune them to different frequencies, so I decided to clarify this once and for all.

XTRX is a 2×2 MIMO transceiver, which means that:

  1. XTRX has 2 receive channels and 2 transmit channels, so you can see “Rx1”, “Rx2”, “Tx1” and “Tx2” antenna connectors on the board.
  2. Both receive channels share a common local oscillator (LO) and thus always receive the same frequency. Same for transmit – both channels share a common LO and always transmit at the same frequency.
  3. At the same time receive and transmit have independent LOs, so you can transmit on one frequency while receiving on another – a mode commonly referred as Frequency Division Duplex (FDD). For communication systems where transmitter should work on the same frequency as a receiver (also known as Time Division Duplex, TDD) LO can be shared between transmit and receive sides of XTRX.

If you want to receive or transmit at two frequencies located close to each other, you still can do this with XTRX by digitally shifting one of the channel frequencies relative to the central frequency. This is called baseband shifting or mixing and can be done either at the time you generate your signal or later by XTRX itself. How far you can move your transmit/receive frequency from the central frequency is limited by the configured sample rate. E.g. for a sampling frequency of 100 MHz you can shift your transmit/receive frequency by 50 MHz above or below the central frequency.

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Product Choices

$260

XTRX

Get an XTRX revision 4 board. Does not include any cables, antennas, or adapter boards.


$515

XTRX Deluxe Bundle

Get an XTRX revision 4 board as well as an Antennas + Cables set, a PCIe x2 + Front End Adapter, and a USB 3 Adapter with Aluminum Enclosure (see below for details). Also comes with four extra U.FL-to-U.FL cables and four extra U.FL-to-SMA-male cables.


$59

Antennas + Cables

A full complement of cables and antennas for your XTRX, including four RF antennas (95 mm, 2 dBi, SMA male, GSM/3G/LTE 880 - 960 MHz, 1710 - 1990 MHz), one GPS antenna, and five cables.


$79

USB 3 Adapter with Aluminum Enclosure

This adapter converts your XTRX from Mini PCIe to USB 3 and comes with an aluminum enclosure designed specifically for XTRX. The adapter has three status LEDs, a micro USB 3 port, one SMA connector for the GPS antenna, four SMA connectors for the MIMO Tx/Rx antenna pairs, a micro SIM card slot, and a slot for a GPIO FPC cable. Comes with a USB cable and all RF cables for internally connecting an XTRX to the SMA connectors. Does not include an XTRX, antennas, or FPC cable.


$99

PCIe x2 + Front End Adapter

This PCIe card securely holds an XTRX board (not included) so it can be used in a standard PCIe x4 slot. It includes an RF front end with a LNA and PA for up to 100 mW output on each channel. A TDD switch is incorporated for applications like TDD LTE. You can bypass the front end by attaching cables directly to XTRX. This adapter achieves the full 10 Gbit/s raw bus bandwidth and can be plugged into x4/x8/x16 PCIe slots. A six-pin JTAG connector makes it easy to program and debug the FPGA. A micro SIM card slot is also present.


$2,900

XTRX PCIe Octopack

This single PCIe card comes loaded with eight (8!) removable XTRX boards, metal installation brackets, enough cables for all GPS and MIMO Tx/Rx ports, and a special board for synchronizing all eight XTRX boards.


$1,900

XTRX Beta Tester

Here's your chance to get an XTRX board as soon as possible. We'll send you an XTRX revision 3 board as soon as the campaign reaches its funding goal and we'll follow up with a production version (revision 4) as soon as they come off the assembly line.

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Credits

Fairwaves

We are a vertically integrated vendor of cellular equipment focused on the needs of emerging markets. We are developing, manufacturing, deploying, and operating turn-key cellular network solutions including radio equipment, towers, power and backhaul all the way to a core network and SS7 interconnect. Our team has been building software-defined radios and systems based on them since 2009 and is well known for its ClockTamer, UmTRX, and UmSITE products.


Alexander Chemeris

CTO

Sergey Kostanbaev

Software & Firmware Development

Andrey Sviyazov

Hardware Design

Albert Gardiner

CEO

Andrey Bakhmat

Marketing

Andy Avtushenko

Manufacturing

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