PUSCH DMRS (LTE-Advanced)

PUSCH DMRS is the uplink user's shared channel Demodulation Reference Signal (DMRS) and is transmitted in each resource block allocated to the user. PUSCH Physical Uplink Shared Channel DMRS is transmitted during symbol 3 (normal CP 1) Contention period, or 2) Cyclic prefix) or symbol 2 (extended CP).

The modulation type used is Zadoff-Chu, causing the constellation for DM-RS DeModulation Reference Signal (LTE) to look like irregularly spaced points on a circle. The PUSCH DMRS Zadoff-Chu sequence values are modulated directly onto the subcarriers using OFDM Orthogonal Frequency Division Multiplexing: OFDM employs multiple overlapping radio frequency carriers, each operating at a carefully chosen frequency that is Orthogonal to the others, to produce a transmission scheme that supports higher bit rates due to parallel channel operation. OFDM is an alternative tranmission scheme to DSSS and FHSS. (rather than using SC-FDMA Single Carrier - Frequency Division Multiple Access like PUSCH).

When RB Auto Detect is selected, Frame Summary will show information about all detected PUSCH DMRS signals which match the PUSCH parameters in the LTE Allocation Editor. This information is located in the PUSCH_DMRS row for User01.

When RB Auto Detect is cleared, Frame Summary will show information about PUSCH DMRS in the PUSCH_DMRS row for the user currently selected for analysis and show "---" for the other users' PUSCH_DMRS rows since the demodulator can only analyze one user at a time.

See Also

LTE Allocation Editor

RB Auto Detect

PUSCH

About Frame Summary

LTE-Advanced Physical Layer Overview