Generating Polar Modulation with R&S SMU200A

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1 Rohde & Schwarz producs: SMU00 Generaing Polar Modulaion wih R&S SMU00 Polar modulaion is a mehod where digial modulaion is realized as a combinaion of phase and ampliude modulaion, raher han using an / modulaor. This echnique becomes increasingly imporan in mobile communicaion. This applicaion noe shows how o generae polar modulaion wih an R&S SMU00 Vecor Signal Generaor. Subjec o change Dr. R. Desquioz 11/004 1GP58_0E

2 Polar modulaion wih SMU Conens 1 Polar Modulaion... Generaing Polar Modulaion wih SMU Required SMU configuraion Seing up polar modulaion Trigger seings Modifying / Signals for Polar Modulaion Ordering informaion... 6 The R&S logo, Rohde & Schwarz, and R&S are regisered rademarks of Rohde & Schwarz GmbH & Co. KG and heir subsidiaries. The following abbreviaions are used in his applicaion noe for R&S es equipmen: The R&S SMU00 Vecor Signal Generaor is referred o as SMU 1 Polar Modulaion Polar modulaion is a mehod where digial modulaion is realized as a combinaion of phase and ampliude modulaion, raher han using an / modulaor. This echnique becomes increasingly imporan in mobile communicaion, especially when exising GSM devices and modules have o be upgraded o EDGE. n GSM modulaors, he phase modulaor is already here, and he ampliude modulaion can be realized by conrolling he gain of he power amplifier. This allows o implemen EDGE wihou major changes of he RF circuis. Figure 1.1 shows in principle how polar modulaion is se up. The modulaing baseband signal is generaed as ime-varian ampliude and phase r and ϕ. The laer drives a phase modulaor o generae a phase modulaed RF signal ha is fed ino a power amplifier. The ampliude modulaion is done by conrolling he bias volage or he power supply of he amplifier. phase modulaor power amplifier RF ϕm bias or power supply ϕ r baseband Figure 1.1: The principle of polar modulaion. 1GP58_0E Rohde & Schwarz

3 Polar modulaion wih SMU Generaing Polar Modulaion wih SMU Modern signal generaors for digial modulaion sysems commonly use he / modulaor principle. Therefore, i is no sraighforward o generae polar modulaion wih such an insrumen, as he signal generaor has o provide a phase modulaed RF signal and he corresponding ampliude modulaion as a separae LF signal. However, he SMU wih is wo-pah concep can do i wihou difficuly..1 Required SMU configuraion The required minimum SMU configuraion is as follows. SMU-10/-11 SMU-13 SMU-10x SMU-10/-11 SMU-13 Figure.1: SMU configuraion for polar modulaion. Hardware Opions RF pah 100 khz o./3/4/6 GHz R&S SMU-10x x aseband x aseband Generaor wih R R&S SMU-10 or R&S SMU-11 x aseband Main Module R&S SMU GP58_0E 3 Rohde & Schwarz

4 Polar modulaion wih SMU. Seing up polar modulaion Figure. shows a ypical es seup for power amplifiers. Power mplifier DUT i cos ϕ ϕ q sin ϕ R waveform bias or power supply r i r r max q 0 R waveform oupu Figure.: Generaing polar modulaion wih an SMU o es a power amplifier. We use pah of he SMU o generae he phase modulaed RF signal. s he SMU uses / modulaion, we have o ransform he ime-varian phase ϕ ino and values according o i cosϕ q sinϕ These / values have o be sored in a waveform file and ransferred o he R of baseband. The ime-varian ampliude r is also ransformed ino and values i r q 0 which have o be ransferred o he R of baseband. The / oupus mus be roued o pah. The ampliude signal is hen available a he oupu. Noe: make sure ha he and waveforms have equal sample rae and equal numbers of samples!.3 Trigger seings To ensure a synchronized sar of baseband and, respecive he wo signal componens ϕ and r, he following rigger seings have o be made. aseband : Mode armed auo, source inernal 1GP58_0E 4 Rohde & Schwarz

5 Polar modulaion wih SMU 1GP58_0E 5 Rohde & Schwarz aseband : Mode armed auo, source inernal baseband Noe ha he phase modulaed par of he signal runs hrough he SMU RF chain, while he ampliude signal does no. This may cause a sligh iming delay beween he wo pars. Therefore a rigger delay for baseband migh be necessary, depending on he acual signal and es seup. 3 Modifying / Signals for Polar Modulaion To modify exising / signals files for polar modulaion, we need o generae wo waveform files from he original / values. This can be done wih he following ransformaion. Wih he well-known relaion beween, and r, ϕ sin cos r r ϕ ϕ and he ransformaion from secion., we ge 1 1 q i + + and 0 + q i where r +

6 Polar modulaion wih SMU 4 Ordering nformaion Vecor Signal Generaor 1 R&S SMU including power cable, uick Sar Guide and CD-ROM wih operaing and service manual Opions RF pah 100 khz o. GHz R&S SMU khz o 3 GHz R&S SMU khz o 4 GHz R&S SMU khz o 6 GHz R&S SMU Overvolage Proecion R&S SMU High-Power Oupu R&S SMU Overvolage Proecion and High-Power Oupu R&S SMU RF pah 100 khz o. GHz R&S SMU khz o 3 GHz R&S SMU Overvolage Proecion R&S SMU High-Power Oupu R&S SMU Overvolage Proecion and High-Power Oupu R&S SMU aseband aseband Generaor wih R 64 MSample and Digial Modulaion R&S SMU realime aseband Generaor wih R 16 MSample and Digial Modulaion R&S SMU realime aseband Main Module R&S SMU Digial modulaion sysems Digial Sandard GSM/EDGE R&S SMU-K Digial Sandard 3GPP FDD R&S SMU-K GPP enhanced MS/S ess incl. HSDP R&S SMU-K Digial Sandard CDM000 incl. 1xEV-DV R&S SMU-K Mulicarrier CW Signal Generaion R&S SMU-K Digial modulaion sysems using R&S WinSM Digial Sandard S-95 wih R&S WinSM R&S SMU-K Digial Sandard CDM000 wih R&S WinSM R&S SMU-K Digial Sandard 3GPP TDD wih R&S WinSM R&S SMU-K Digial Sandard TD-SCDM wih R&S WinSM R&S SMU-K User-Defined OFDM Signals wih R&S WinSM R&S SMU-K and R&S WinOFDM Digial Sandard 1xEV-DO wih R&S WinSM R&S SMU-K Digial Sandard EEE a/b/g wih R&S WinSM R&S SMU-K Digial Sandard 3GPP FDD incl. HSDP wih R&S WinSM R&S SMU-K Noise ddiive Whie Gaussian Noise WGN R&S SMU-K Oher opions ER/LER Measuremen R&S SMU-K The base uni can only be ordered wih an R&S SMU-10x frequency opion. R&S WinSM requires an exernal PC. 1GP58_0E 6 Rohde & Schwarz

7 Polar modulaion wih SMU Recommended exras Hardcopy manuals in German Hardcopy manuals in English, UK Hardcopy manuals in English, US " Rack daper R&S ZZ daper for Telescopic Sliders R&S ZZ-T NC daper for UX /O connecor R&S SMU-Z Keyboard wih US nerface US assignmen R&S PSL-Z Mouse wih US inerface, opical R&S PSL-Z Exernal US CD-RW Drive R&S PSP ROHDE & SCHWRZ GmbH & Co. KG. Mühldorfsraße 15. D München. P.O D München. Telephone Fax nerne: hp:// This applicaion noe and he supplied programs may only be used subjec o he condiions of use se forh in he download area of he Rohde & Schwarz websie. 1GP58_0E 7 Rohde & Schwarz

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