A Fully Integrated 32 Gbps 2x2 LoS MIMO Wireless Link with UWB Analog Processing for Point-to-Point Backhaul Applications

In this paper, we demonstrate a proof-of-concept 130 GHz wireless 2×2 line-of-sight (LoS) multi-input multi-output (MIMO) transceiver using fully packaged transmit and receive arrays and scalable analog baseband processing. The link utilizes the Rayleigh criterion to transmit independent wireless streams over a LoS channel. The transmitter (TX) and receiver (RX) chips are fully packaged with integrated mm-wave antennas. The two-element QPSK TX array consumes 432 mW, while the entire four-channel QPSK MIMO RX consumes 630 mW and supports four concurrent 130 GHz mm-wave channels with a simulated passband bandwidth of 20 GHz. Wireless measurements demonstrate 32 Gbps QPSK transmission over 40 cm, allowing for a link efficiency of 83 pJ/ bit/ m and an energy efficiency of 33 pJ/ bit. Scaling the system from the two channels measured here to the four channels supported by the RX chip will double the data rate as well as the range reported.