Protection ratios and overload thresholds between 700 MHz FDD-LTE and analog/digital terrestrial television

摘要

This paper aims to identify and evaluate the protection ratios and overload thresholds between 700 MHz FDDLTE and analog/digital terrestrial television systems. The evaluated analog and digital terrestrial television (A TT and DTT respectively) systems were the NTSC-M and DTMB, respectively. All the tests were conducted in a confined environment at the laboratory level. Eight different interference scenarios were evaluated under different LTE configurations such as 0/100 % of system load and 5, 10, and 20 MHz of bandwidth. For each interference scenario and LTE system configuration, co-channel and adjacent channel interference conditions were evaluated with a frequency offset between the wanted and unwanted signal of up to 100 MHz. A total of 964 measurement values were registered during the laboratory tests. The tests intended to identify the conditions that make possible the coexistence between these services. The results analysis shows that the ATT service is at least 14 dB more sensible to LTE interference than the DTT service. The ATT service is at least 4 dB more sensible to LTE interference from the left side (-$Delta f$) than from the right side ($+Delta f$). The LTE user equipment is 9 dB more sensible to co-channel interference from the DTT service than from the ATT service. The LTE user equipment and base station are more sensible to adjacent channel ATT interference from the right side (+$Delta f$) than from left side (-$Delta f$) and from $pmDelta f$ of DTT interference.