OBPSR: A multi-signal receiver based on the orthogonal and bandpass sampling techniques

Multi-signal receivers with integrated functions in the receive/transmit chain are desired in Wireless technology devices such as Smartphones, due to processing time, cost and size saving. This paper proposes a new multi-signal receiver design that formats signals orthogonally for processing by a single Costas Quadrature Phase-Locked-Loop CQPLL; thus allowing the digital processor to switch from tracking/decoding anyone of the received signals to the other without losing phase lock or time. Our receiver utilizes a Hilbert Transform for shifting one of the signals by 90° to prevent overlapping before using Bandpass sampling to fold the two signals to the same frequency in the First Nyquist Zone. The resultant orthogonal kernels are fed to a single CQPLL for tracking and demodulation. Matlab simulations prove our new technique that also reduces the sampling frequency to a rate proportional to the maximum bandwidth, instead of the summation of bandwidths, of the input signals.