Analytical Model of Quantization Noise for In-Band Full-duplex Wireless Communications

The in-band full-duplex (IBFD) wireless communications are attracting attention as a key technology to ideally double a channel capacity for the beyond 5G. In this paper, we propose an analytical model of the effect of N-bit A/D quantization noise on the channel capacity of the desired signal at the base station (BS) in the IBFD wireless communications. We derive the averaged and peak power of the input signal to the N-bit A/D and the quantization noise power of the N-bit A/D to formulate the effective uplink (UL) channel capacity. Numerical analysis results by the proposed analytical model show that the quantization noise is not a problem in the case of the 16-bit A/D; however, the UL channel capacity is degraded by 10-30% in the case of the 12-bit A/D and 50-90% in the case of the 8-bit A/D.