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The implementation of wireless power transfer in wireless communicationsystems opens up a new research area, known as wirelessly poweredcommunications (WPC). In next-generation heterogeneous networks whereultra-dense small-cell base stations are deployed,simultaneous-wireless-information-and-power-transfer (SWIPT) is feasible overshort ranges. One challenge for designing a WPC system is the severe near-farproblem where a user attempts to decode an information-transfer (IT) signal inthe presence of extremely strong SWIPT signals. Jointly quantizing the mixedsignals causes the IT signal to be completely corrupted by quantization noiseand thus the SWIPT signals have to be suppressed in the analog domain. Thismotivates the design of a framework in this paper for analog spatialcancellation in a multi-antenna WPC system. In the framework, an analog circuitconsisting of simple phase shifters and adders, is adapted to cancel the SWIPTsignals by multiplying it with a cancellation matrix having unit-moduluselements and full rank, where the full rank retains the spatial-multiplexinggain of the IT channel. The unit-modulus constraints render the conventionalzero-forcing method unsuitable. Therefore, the paper presents a novelsystematic approach for constructing cancellation matrices. For thesingle-SWIPT-interferer case, the matrices are obtained as truncatedFourier/Hadamard matrices after compensating for propagation phase shifts overthe SWIPT channel. For the more challenging multiple-SWIPT-interferer case, itis proposed that each row of the cancellation matrix is constructed as aKronecker-product of component vectors, with each component vectors designed tonull the signal from a corresponding SWIPT interferer similarly as in thepreceding case.

Analog Spatial Cancellation for Tackling the Near-Far Problem in Wirelessly Powered Communications (Extended Version)