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Rohde and Schwarz has launched the FSH4 and FSH8 handheld spectrum analysers that provide a detailed view of long-term evolution (LTE) signals – a significant advantage when troubleshooting.

The analysers offer functions for detailed measurements in LTE networks.

Users can perform modulation analysis in the LTE frequency division duplex (FDD) and time division duplex (TDD) modes.

The new options are said to provide a more detailed view of LTE signals than possible with other manufacturers’ instruments.

The handheld analysers can analyse the complete LTE frame with up to 10 sub-frames as called for by the standard.

They support extended cyclic prefix as defined in the standard.

The extended cyclic code prefix reduces interference due to delay spread in large radio cells.

In addition, the analyser can be used to test parallel multi-antenna signal transmissions up to 4×4 MIMO.

Many network operators are upgrading their networks to support long-term evolution (LTE), the next generation of mobile communications technology, and some LTE networks are already up and running.

Installation and service technicians need handheld analysers that can be used to set up and optimise LTE networks or to eliminate interference.

The standard models of the RandS FSH4 and RandS FSH8 handheld analysers offer a demodulation bandwidth of 20MHz, which covers all the signals defined in the LTE standard.

Software options for analysing modulation in LTE networks are available for the handheld analysers.

The FSH-K50 and FSH-K51 options allow modulation analysis on LTE FDD and LTE TDD base stations respectively.

Both options support all key LTE measurements, from single input, single-output (SISO) to 4×4 multiple input, multiple-output (MIMO) transmissions.

Equipped with the LTE analysis options, the RandS FSH4 and RandS FSH8 provide a detailed view of LTE signals.

The handheld analysers support both normal cyclic prefix and extended cyclic prefix.

The LTE standard specifies that each symbol within an LTE frame be preceded by a cyclic prefix to prevent overlapping of symbols and reduce intersymbol interference.

The normal cyclic prefix is designed for a distance of around 1.5km.

For larger radio cells, the LTE standard specifies frames with fewer single pulses and longer prefix (extended cyclic prefix).

The Rohde and Schwarz analysers can process LTE signals with extended cyclic prefix.

They also demodulate LTE frames with up to 10 sub-frames as defined in the standard.

They display the power and modulation quality (EVM) of the data signal (PDSCH) and of other signal components.

For the data signal, these parameters are broken down by modulation type.

This level of detail allows users to better localise errors.

The standard models offer several spectrum analysis functions for LTE, including the measurement of channel power and the identification of spurious emissions that could interfere with adjacent transmit signals.

Pre-defined LTE masks allow users to quickly perform spectrum emission mask measurements in a few steps.

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