name: DMRS
full_form: Demodulation Reference Signal
context: For 4Rx capable UEs all single carrier tests specified in 8.2 to 8.8 with 2Rx are tested on any of the 2 Rx supported RF bands by connecting 2 out of the 4Rx with data source from system simulator, and the other 2 Rx are connected with zero input, depending on UEâs declaration and AP configuration. Same requirements specified with 2Rx should be applied. For 4Rx capable UEs without any 2Rx RF bands, all single carrier tests specified in 8.2 to 8.8 with 2Rx are tested on any of the 4Rx supported RF bands by duplicating the fading channel from each Tx antenna and add independent noise for each Rx antenna. Figure 8.1.2.6.1-1 shows an example of antenna connection for 4Rx UE in any one 4Rx supported RF band to perform a 2Rx performance test with antenna configuration as 2x2 without interference for information. The SNR requirements should be applied with 1.5 dB less than the number specified with 2Rx for test configuration with CRS-based TM and with 1.5 dB less than the number specified with 2Rx for test configuration with DMRS-based TM. Figure 8.1.2.6.1-1 Antenna connection example for 2Rx tests with antenna configuration as 2x2 without interference (informative) For 4Rx capable UEs without any 2Rx supported RF bands, for all single carrier tests listed in Table 8.1.2.6.1-0 specified from 8.2 to 8.8 with 2Rx can be skipped. Table 8.1.2.6.1-0: Requirement lists for 4Rx capable UEs For 4Rx capable UEs, if corresponding tests listed from the 4Rx test lists from Table 8.1.2.6.1-1 are tested, the test coverage can be considered fulfilled without executing the corresponding tests listed from the 2Rx test lists from Table 8.1.2.6.1-1. Table 8.1.2.6.1-1: Applicability rules for single carrier tests with 2Rx
description: The Demodulation Reference Signal (DMRS) is a type of reference signal used in the Evolved Universal Terrestrial Radio Access (E-UTRA) to facilitate demodulation at the receiver end. It is an essential component in the physical layer of the LTE system, enabling the receiver to accurately estimate the channel conditions and decode the transmitted data.
explanation: DMRS is classified as a Channel because it serves as a reference signal for demodulation purposes, which is a critical aspect of wireless communication channels. The context provided highlights its role in facilitating accurate channel estimation and data decoding, aligning with the 3GPP's specifications for E-UTRA.
section_title: 8.1.2.6.1 Applicability rule and antenna connection for single carrier tests with 2Rx
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