This project is coming soon. Sign up to receive updates and be notified when this project launches.
If you’re working on a massive MIMO system or have a large swath of spectrum you need to monitor, XYNC (pronounced iks-sync) is right for you. XYNC builds on the success of the Octopack SDR we offered during the XTRX campaign and takes into account feedback from the original Octopack users. XYNC comes in the following variations:
|XYNC Model||Included XTRXs||Transmit||Receive|
|XYNC Quadro||4||8 channels (4 independent pairs), 30 MHz - 3.7 GHz||8 channels (4 independent pairs), 30 MHz - 3.7 GHz|
|XYNC Quadro 6 GHz RX||4||8 channels (4 independent pairs), 30 MHz - 3.7 GHz||8 channels (4 independent pairs), 1.8 GHz - 6 GHz|
|XYNC Octo||8||16 channels (8 independent pairs), 30 MHz - 3.7 GHz||16 channels (8 independent pairs), 30 MHz - 3.7 GHz|
|XYNC Octo x2||16||32 channels (16 independent pairs), 30 MHz - 3.7 GHz||32 channels (16 independent pairs), 30 MHz - 3.7 GHz|
You can connect together two XYNC boards if you either want to increase the number of RX/TX channels (e.g., two XYNC Octos give you 32 TX and 32 RX channels) or want to increase throughput per channel (e.g., two XYNC Quadros give you twice the throughput of a single XYNC Octo). Connecting more than two XYNC boards is also possible, but requires an external clock and 1pps signal distribution circuitry (not provided as part of this campaign).
A single XYNC comes equipped with four or eight removable XTRX boards, metal installation brackets, cables for all of the TX/RX ports and the GPS port, and a special board for synchronizing the XTRX units. Each onboard XTRX provides two transmit channels and two receive channels. Thus, XYNC Quadro (with four XTRX units) has eight transmit and eight receive channels, and XYNC Octo (with eight XTRX units) has 16 transmit and 16 receive channels. Two XYNC Octo can be synchronized and will give you 32 transmit and 32 receive channels.
On the digital side, each XTRX unit is connected to a PCIe switch which multiplexes the XTRX PCIe lanes into a single PCIe 2.0 x4 connector. This makes it easy to install into a standard PC in a very compact way - just don’t forget to provide enough air flow for cooling, as it can get quite hot.
A single XTRX is shown above. XYNC includes up to eight XTRX boards.
XYNC is based on multiple synchronized XTRX SDRs, so the maximum achievable RF bandwidth is a function of the individual XTRX RF bandwidths.
If you want to tune XYNC channels to receive or transmit at different parts of the spectrum, please keep two things in mind:
XYNC uses a PCIe switch to connect all its XTRXs to a single PCIe bus. The XTRXs are connected to the PCIe switch with PCIe 2.0 x1 buses, and the switch is connected to the host with a PCIe 2.0 x4 bus, which introduces additional limits to the XYNC sampling rate and throughput compared to a single XTRX.
Expanding on the (theoretical) maximum XTRX throughput limits, we get the following throughput per channel for XYNC Quadro and Octo in various configurations. Green cells indicate combinations of sample rate and PCIe bus configuration where the sampling rate is not limited by the PCIe bus but is rather limited by the XTRX itself.
|Mode||IQ x Ch x bits||Bits total||PCIe 1.0 x1 (max 1,750 Mbps)||PCIe 2.0 x1 or PCIe 1.0 x2 (max 3,500 Mbps)||PCIe 2.0 x2 (max 7,000 Mbps)||PCIe 2.0 x4 XYNC Total throughput (max 14,000 Mbps)||PCIe 2.0 x4 per XYNC Quadro channel (max 14,000 Mbps)||PCIe 2.0 x4 per XYNC Octo channel (max 14,000 Mbps)|
|8-bit SISO||2 x 1 x 8||16 bits||109 Msps||219 Msps||438 Msps||875 Msps||219 Msps||109 Msps|
|12-bit SISO||2 x 1 x 12||24 bits||73 Msps||146 Msps||292 Msps||583 Msps||146 Msps||73 Msps|
|16-bit SISO||2 x 1 x 16||32 bits||55 Msps||109 Msps||219 Msps||438 Msps||109 Msps||55 Msps|
|8-bit MIMO||2 x 2 x 8||32 bits||55 Msps||109 Msps||219 Msps||438 Msps||109 Msps||55 Msps|
|12-bit MIMO||2 x 2 x 12||48 bits||36 Msps||73 Msps||146 Msps||292 Msps||73 Msps||36 Msps|
|16-bit MIMO||2 x 2 x 16||64 bits||27 Msps||55 Msps||109 Msps||219 Msps||55 Msps||27 Msps|
What exactly does XYNC synchronize? The answer is a bit complex. Below are some important facts you should keep in mind: