R&S®ETL TV Analyzer - Product Brochure - Rohde & Schwarz

Precise analysisof digital singlefrequencynetworks(SFN)Transmitters that broadcast a standard based on theOFDM method, such as DVB-T, DVB-H, DVB-T2, ISDB-T (B), T-DMB/DAB, DTMB and the extended single carrierstandard ATSC MDTV can be combined and operated asa single-frequency network (SFN). For interference-freeoperation, certain criteria need to be optimized, observedand regularly monitored. These criteria are the transmitterfrequency, the level and the delay at the transmitter and inthe reception area. The R&S®ETL TV analyzer comes witha range of high-precision measurements that help to optimallyset up and operate a transmitter SFN.High-precision display of channel impulse responseWhen it comes to optimizing and monitoring an SFN, themain function of the R&S®ETL is to accurately measurethe channel impulse response and display it in a clear andunderstandable manner. The delays in an SFN have to beset so that all the receivable transmitters at a receptionsite are within a guard interval. Any transmitter outsidethe guard interval would act as an interferer. The R&S®ETLuses green lines to show the beginning and end of a guardinterval, making it easy to evaluate the timing characteristics.Impulses are measured and displayed to an accuracyof < 20 ns. A high-resolution zoom function is provided toevaluate impulses that are temporally close together.DTV extended time domainUsefuldata carrierScattered pilots(interpolation versus time)Frequency domain: H(k)k1 ____∆t echo∆f ODFMIFFTTime-domaindisplay range:normalTime-domaindisplay range:extendedTime domain: echo pattern______ 1______ 2____ 1∆t echo3×∆f OFDM3×∆f OFDM∆f OFDMk20