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Next generation testing technology
WCDMA systems, to choose one 3G example, exhibit non-constant envelope characteristics in RF modulation and closed loop power control, where base stations are controlling the transmit powers of the mobiles and vice versa. These features increase the input signal power variation considerably, which sets increased demands on the simulator linearity.
The increased complexity of wireless communications environments and test scenarios necessitate more realistic channel simulation beyond standard channel models. To reach the ultimate degree of reality, the simulator should be able to import measured channel responses and then reproduce the measured channel as accurately as possible. The range of physical environments in which the 3G radios will be used—from high mobility outdoor macro cells to indoor static terminal scenarios—introduces a new range of propagation phenomena. This makes the role of radio channel simulators increasingly critical in making 3G radios work.
Thanks to a solid background in wideband spread spectrum systems, Elektrobit of Finland has been able to develop advanced test equipment that fit into CDMA-based 3G systems and experimental 4G systems.
Among these is PROPSim+, a Wideband Radio Channel Simulator that enables the wireless systems developers to simulate complex, realistic environments and propagation phenomena real-time in the laboratory.
With an integrated ARM7 TDMI(TM) MCU and OAK(TM) DSP core, DSPC’s CDMA chipset provides a compact solution for satisfying cdmaOne baseband processing requirements. The D5421 WorldCDMA chipset is based on 0.25 micron CMOS technology featuring high speed and 2.5V operation. The D5421 is available in low footprint FPBGA packaging.
The WorldCDMA chipset family offers a worldwide cdmaOne-compliant solution for complete baseband processing for dual mode cellular, PCS, and WLL handsets. Implementing three vocoders, including the 8 Kbps and 13 Kbps QCELP(R) and EVRC, the WorldCDMA family offers high voice quality to end-users together with compliance with worldwide standards’ requirements. With built-in flexibility for software modifications, WorldCDMA chipsets can be easily customized, giving handset manufacturers the ability to differentiate their products.