r&s®smw-九游官网下载

the r&s^®smw-k76 option allows simultaneous playback of up to eight different arb waveforms from one r&s^®smw200a. all eight baseband signals can individually be faded (with 4x r&s^®smw-b14 options). also awgn (2x r&s^®smw-k62 option) can be added if needed. all eight signals can be added up in realtime with individual frequency, level and phase offsets. by that it is very easy to generate multi-carrier signals for interference simulation or multi-standard radio tests.

changing a single parameter of one carrier is independently possible from the other carriers. time-consuming recalculation of a big multi-carrier waveform is avoided.

multi-carrier waveforms can only be used to generate signals with a limited spacing between the carriers, especially if a certain sequence length for each carrier is required. with the r&s^®smw-k76 each of the eight baseband signals in the r&s^®smw200a is generated with its own sequence length and – if desired – with non-truncated pn sequence. due to real-time addition and routing of the signals inside the r&s^®smw200a the constraint of having one common multi-carrier waveform does no longer exist. this is the pre-requisite for simultaneous throughput analysis for multiple carriers by a receiver. by that the r&s^®smw-k76 allows new and more time-efficient test concepts.

a combination of one dual-path r&s^®smw200a and six r&s^®sgt100a with phase coherence option (r&s^®smw-b90/r&s^®sgt-k90) allows generation of eight phase coherent rf signals up to 6 ghz. with r&s^®smw-k76 the r&s^®smw200a is able to generate all eight time-synchronized baseband signals with individual phase and level offsets for each baseband signal. this simplifies time-alignment and rf phase calibration.

by means of r&s^®sgs100a and r&s^®sgu100a phase coherency setups for microwave frequencies (e.g. up to 40 ghz) can also be realized.

lte-advanced defines that up to 5 carriers can be aggregated in downlink direction. by means of the r&s^®smw-k76 option the r&s^®smw200a is able to generate all 5 component carrier signals from a single instrument. the baseband configuration is conveniently done via a common lte signal generation dialog. all carriers can be individually configured. cross-carrier scheduling is also supported. if desired, frequency correct real-time channel simulation can be added for each individual carrier.

for intra-band scenarios all 5 carriers are added up with frequency offsets/level offsets and output via a common rf path of the r&s^®smw200a.

lte-advanced defines that up to 5 carriers can be aggregated in downlink direction. by means of the r&s^®smw-k76 option the r&s^®smw200a is able to generate all 5 component carrier signals from a single instrument. the baseband configuration is conveniently done via a common lte signal generation dialog. all carriers can be individually configured. cross-carrier scheduling is also supported. if desired, frequency correct real-time channel simulation can be added for each individual carrier.

for inter-band scenarios the carrier frequencies are often spaced far apart so that a separate rf synthesizer is needed for each lte band that has to be covered. the r&s^®smw200a features up two internal rf synthesizers. i.e. carrier aggregation scenarios with two lte bands can be covered by a single r&s^®smw200a. more bands can be covered by adding additional r&s^®sgt100a vector rf sources to the setup. if required, every component carrier can be placed in a separate frequency band.

for increased throughput, lte-advanced defines to combine carrier aggregation with mimo. by means of the r&s^®smw-k76 multiple entities option and the mimo channel simulation capabilities of the r&s^®smw200a, the user is able to generate advanced lte test scenarios with a single instrument. the example below shows a r&s^®smw200a system configuration with 4 component carriers, each with 2x2 mimo.

lte-advanced release 11 defines methods for interference coordination between multiple lte cells. this lte features is named “further enhanced inter-cell interference coordination (=feicic)”. the test case in line with 3gpp ts 36.521 requires simultaneous simulation of three cells with 2x2 tx diversity. by means of the r&s^®smw200a the required serving cell as well as the two interfering aggressor cells can be simulated by a single instrument.