2019/11/22 by Felipe Gómez-Cuba, Gomez-Cuba, Felipe, Mainak Chowdhury +7 · 1 citation
Computer Science · Engineering · #Advanced MIMO Systems Optimization #Advanced Wireless Communication Techniques #Cooperative Communication and Network Coding #FOS: Computer and information sciences #Information Theory (cs.IT) #Wireless Communication Networks Research
paper · pdf · doi:10.48550/arxiv.1911.09965
openalex publication_date 2019/11/22 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The scaling of coherent and non-coherent channel capacity is studied in a\nsingle-input multiple-output (SIMO) block Rayleigh fading channel as both the\nbandwidth and the number of receiver antennas go to infinity jointly with the\ntransmit power fixed. The transmitter has no channel state information (CSI),\nwhile the receiver may have genie-provided CSI (coherent receiver), or the\nchannel statistics only (non-coherent receiver). Our results show that if the\navailable bandwidth is smaller than a threshold bandwidth which is proportional\n(up to leading order terms) to the square root of the number of antennas, there\nis no gap between the coherent capacity and the non-coherent capacity in terms\nof capacity scaling behavior. On the other hand, when the bandwidth is larger\nthan this threshold, there is a capacity scaling gap. Since achievable rates\nusing pilot symbols for channel estimation are subject to the non-coherent\ncapacity bound, this work reveals that pilot-assisted coherent receivers in\nsystems with a large number of receive antennas are unable to exploit excess\nspectrum above a given threshold for capacity gain.\n