Rohde and Schwarz FSH-K50E - LTE FDD Downlink Extended Channel and Modulation Measurement Option for FSH

Rohde and Schwarz offers several options for the FSH spectrum analyzer to analyze of LTE FDD and TDD transmit signals.

• FSH-K50: LTE FDD downlink pilot channel and EVM measurement
• FSH-K50E: LTE FDD downlink extended channel and modulation measurement (requires FSH-K50)
• FSH-K51: LTE TDD downlink pilot channel and EVM measurement application
• FSH-K51E: LTE TDD downlink extended channel and modulation measurement application (requires FSH-K51)

The R&S FSH-K50E/-K51E options are available for in-depth LTE analysis. In addition to displaying the EVM value, this option includes a constellation diagram that graphically displays the quality of the LTE signal. The different modulation types and LTE signal components can be displayed separately. An LTE BTS scanner is provided for measurements over the air interface. This scanner shows the power of the up to eight strongest LTE signals and provides a quick overview of all LTE base stations in the surrounding area.

Constellation diagram

If you equip the R&S FSH with option R&S FSH-K50E or FSH-K51E, the constellation diagram becomes available to visualize the results in a diagram.

The constellation diagram shows the location of the transmitted symbols in the complex plane. It is therefore an indicator of the quality of the modulation of the signal.

By default, the result display shows the symbol locations over all allocations. In that case, the R&S FSH distinguishes modulation schemes used in the transmission of data channels by using different colors.

For easy identification of the pilot, synchronization and control channels in the diagram, the R&S FSH also uses different colors.

BTS scanner

The R&S FSH-K50E and FSH-K51E also provide a BTS scanner.

If you are measuring over-the-air (OTA) signals, you can use the BTS scanner to identify base stations in the area. Every base station is identified by its cell ID. The BTS Scanner shows the cell ID for every base station it has detected. For every base station it also shows the power graphically (each yellow bar represents an active and detected base station) and numerically in a table above the diagram. The table also shows the power of the S-SYNC or P-SYNC of the base station.

Resource allocations result display

The R&S FSH-K50E and FSH-K51E also provide the resource allocations result display to visualize the results in a diagram.

The resource allocations result display shows the power of each resource element in the signal. Each row of the diagram corresponds to a resource block. The columns represent a subframe each.

The resource allocation is thus a good way to measure the amount of traffic currently on the carrier based on the power levels of each resource block.

The power of the resource elements is represented by colors, with a map showing the corresponding power levels next to the diagram. By default, the R&S FSH automatically scales the color map according the signal powers it receives.