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Solve the mobile radio channel fading LTE Test Solutions

In Electronic Infomation Category: S | on April 20,2011

With the global cellular communications network operators to gradually adopt LTE, LTE requirements to meet all the demand is also growing, including the fading characteristics. Third Generation Partnership Project (3GPP) standards in its TS 36.521-1 provides the technical specifications of the decline to the decline of measured characteristics of LTE mobile phones. Fading characteristics of traditional testing methods

external fading simulator and PC87338VJG datasheet and noise sources, modified by conventional RF test equipment signals. The device significantly increased the cost of the test system, and PC87338VJG price and requires additional software to control and PC87338VJG suppliers and coordinate the various instruments. This article will introduce an innovative all-digital fading simulation method, this method can greatly reduce the increase in Guizhong generated by the equipment costs, while improving accuracy and reducing test time.

Analog signal fading

Shown in Figure 1, the actual system environment, there are numerous between the transmitter and receiver paths. Obviously, can not simulate all paths, but in order to meet the testing purposes, that loss was significantly greater than the "best" quality of the received signal path and a negative impact on the path, we will ignore it. Similarly, the longer the path delay will result in very high loss, does not require simulation. According to a similar delay path, and the statistical effect of Doppler shift can be further simplified simulation. The equivalent baseband signal Aeroflex RF (RF) conversion, perhaps the simplest method.

wireless communication system in Figure 1, the "weakness" phenomenon, from the multi-path signal transmission

Shown in Figure 2 (a) shows, the radio channel simulation to test two instruments commonly used, that is fading simulator and additive white Gaussian noise (AWGN) source. Fading simulator to imitate the base station and user equipment changes over time between the RF path, AWGN source to mimic other cell or user interference.

Figure 2, the decline of traditional testing methods and Aeroflex 700 compared with RF tester

Addition to the cost of additional equipment generates, but this traditional approach there are the following limitations:

Signal level instability, require very careful calibration.

External components have insertion loss and delay.

Need to manually change the connection of different tests.

Independent fading limited number of RF channels - can not meet the soft-switching (UMTS), antenna diversity and MIMO (Multiple Input / Multiple Output) testing requirements for the environment.

Analog components reduces signal quality.

Difficult or impossible to precisely repeat the test.

Baseband fading simulation

Contrast, built-in fading simulator option Aeroflex 7100 Radio Test using the test methods shown in Figure 2 (b) below. 7100 test platform (Figure 3) the decline of analog functions required to meet or exceed all 3GPP and LTE user equipment according to an unprecedented flexibility in allocation of residential and fading paths, no need to manually re-configured. Built-in fading simulator 7100 tester can perform a complete duplication of tests, including simulated dynamic environment, reliable and accurate test MIMO system.

Figure 3 Aeroflex 7100 Radio Test

7100 platform, each of the base-band module is a Micro-TCA card, containing a variety of general-purpose processor (GPP), DSP, FPGA and two-way high-speed digital links.

Generate a baseband or baseband output of a large number of cell samples can be SISO (single input, single output), it can be MIMO. AWGN in the signal reaches the RF module by adding the signal to simulate other interference cell. This is an all-digital solution: increase the use fading and noise do not have any new analog. This calibration problem can be eliminated, transferred to the analog signal can be completely reused.

Baseband module for each multipath fading simulator supports up to 9 paths, each path can be added to the signal transmission with independent gain and time delay.

Aeroflex 7100 radio test platform offers scalable baseband and RF source. As Jia Ruji with the module, not the radio channel, fading is an extensible source. By adding 7100 units, only slightly adjusted on the physical connection, you can increase the area, the antenna or decline path.

RF engineers, systems integrators and regression test engineers need to do any testing of new features for LTE. To meet the future needs of LTE, Aeroflex 7100 fading simulator supports all of the following LTE 20 MHz bandwidth, frequency range up to 6GHz. Fading fading simulator supports all 3GPP specifications, user device to determine whether their 3GPP test specifications.

Conclusion

Aeroflex 7100 test platform fading simulators and AWGN option, the user equipment designed to overcome the traditional test methods used in the RF channel limitations of external components. In addition, the 7100 test instrument is also to meet the various requirements of 3GPP LTE test to provide a complete solution, including MIMO, antenna diversity and soft handover, as opposed to the procurement of external components, can be very low cost to provide accurate, repeatable testing results.

7100 Aeroflex digital radio test instrument with proven RF and baseband technology, with support LTE terminal protocol test equipment, RF parameters and unique function. 7100 tester from the physical layer IP core network infrastructure to a comprehensive network simulation, with small table tester LTE mobile devices for the complete test system.

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