This paper presents a novel receiver architecture for Millimeter-Wave (mm-Wave) digital beamforming (DBF) applications. The receiver employs On-Site Code Division Mul-tiplexing (OS-CDM) scheme to receive and uniquely encode signals from multiple antenna elements using orthogonal Walsh-Hadamard (WH) codes. Subsequently, the signals are combined and passed through a single analog-to-digital converter (ADC). This approach eliminates the need for multiple power hungry ADCs, thus significantly reducing the size, weight, cost and power (SWaP-C) requirements. Further, the digital hardware complexity of the receiver is reduced by more than 95%. A major challenge is the possible degradation in the signal-to-noise ratio (SNR) due to inter-channel interference (ICI). In this paper, we introduce new schemes to achieve greater than 30 dB inter-channel interference ratio reduction across a bandwidth of 400 MHz.
