2019/01/08 by Raghunandan M. Rao, Rao, Raghunandan M., Vuk Marojevic +3
Engineering · #Advanced MIMO Systems Optimization #FOS: Computer and information sciences #IoT Networks and Protocols #Networking and Internet Architecture (cs.NI) #Wireless Body Area Networks
paper · pdf · doi:10.48550/arxiv.1901.02574
openalex publication_date 2019/01/08 · openalex created_date 2022/07/30 · openalex updated_date 2026/07/28
Modern wireless systems such as the Long-Term Evolution (LTE) and 5G New\nRadio (5G NR) use pilot-aided SINR estimates to adapt the transmission mode and\nthe modulation and coding scheme (MCS) of data transmissions, maximizing the\nutility of the wireless channel capacity. However, when interference is\nlocalized exclusively on non-pilot resources, pilot-aided SINR estimates become\ninaccurate. We show that this leads to congestion due to retransmissions, and\nin the worst case, outage due to very high block error rate (BLER). We\ndemonstrate this behavior through numerical as well as experimental results\nwith the 4G LTE downlink, which show high BLER and significant throughput\ndetriment in the presence of non-pilot interference (NPI). To provide useful\ninsights on the impact of NPI on low-latency communications, we derive an\napproximate relation between the retransmission-induced latency and BLER. Our\nresults show that NPI can severely compromise low-latency applications such as\nvehicle-to-vehicle (V2V) communications and 5G NR. We identify robust link\nadaptation schemes as the key to reliable communications.\n