Squared_Link. Brief description

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Squared_Link. SDR platform


SDR platform Squared_Link is a digital transceiver intended for implementation in wireless modems. Embedded software of Squared_Link is a multimode OFDM transceiver based on OFDM technology, it can work in wideband, narrowband modes, spread spectrum mode and fragmented spectrum mode. Hardware of Squared_Link is based on Altera's Cyclone V FPGA and AD9361 transceiver. Evaluation kit Squared_Modem includes RF board and motherboard with Ethernet interface, it can be used as standalone solution too.


  • Communication technology: scaled OFDM1024 with unique technology for mixing of wideband, narrowband, spread spectrum and fragmented spectrum signals in one air link frame. (Learn more about OFDM_MultiMode).
  • Duplexing mode: TDD or FDD.
  • Bandwidth: 1-20 MHz (smoothly variable).
  • Modulation: BPSK; QPSK; 8QAM; 16QAM; 64QAM; 256QAM.
  • FEC: LDPC.
  • Maintaining coding rates: 1/2; 2/3; 3/4; 5/6.
  • Spread spectrum mode features:
    • spreading factor: any even number in range from 2 to 106;
    • SNR (BER=10-6, spreading factor 106): -17 dB;
    • maximal signal search duration: 1 sec.
  • MIMO features (maintenance depends on hardware version):
    • number of antennas: 2;
    • working modes: SISO, SIMO, MISO, MIMO;
    • space time code in MISO and MIMO modes: Alamouti code.
  • Air link frame duration: 2-20 ms.
  • Cyclic prefix duration: 1/32; 1/16; 1/8; 1/4.
  • Carrier frequency range: 70-6000 MHz.
  • Maximal TX output power: -6 dBm.
  • RX sensitivity depends on bandwidth, modulation, FEC rate and LNA performance (see Squared_Link. Brief description).
  • Information bandwidth depends on bandwidth, modulation and FEC rate (see Squared_Link. Brief description).
  • Network configurations: P2P; PMP; mesh networking.
  • Interfaces:
    • universal: GMII; RGMII; MII; RMII; 1,2,4,8 bits wide bus;
    • control: USB, UART;
    • debug: JTAG.
  • Downloadable by user:
    • preamble modulation sequence;
    • spreading codes for spread spectrum mode;
    • pilot subcarriers modulation sequence;
    • pilot and informational subcarriers location.
  • Available statistical information about channel:
    • input signal samples;
    • spectrum of useful signal;
    • spectrum analyzer mode;
    • RSSI;
    • timing offset;
    • frequency offset;
    • FEC FER;
    • FEC decoder iterations number;
    • TX-RX range calculated from signal delay.
  • Power: 3.3 V.
  • Available hardware versions:
    • 5CEBA5 FPGA (only SISO mode with bandwidth up to 12 MHz);
  • Power consumption: 2.9 W (12 MHz bandwidth, TDD mode 50/50, 5CEBA7 FPGA).
  • Physical dimensions: 55x40x8 mm.