LTE and LTE-Advanced
LTE - Long Term Evolution
Anritsu offers a complete line of LTE and LTE-A test equipment to ensure the performance and quality of your LTE equipment and networks. Our Signalling Tester MD8430A is the first complete LTE-Advanced Base Station Simulator. Couple the Fading Simulator MF6900A with the Base Station Simulator MD8430A to provide a reproducible fading environment that is essential for evaluating LTE-Advanced. The Signal Analyzer provides complete LTE uplink and downlink analysis in a one-box platform that includes signal analysis and signal generation. Our Vector Signal Generator produces realistic and reproducible LTE signals and our LTE IQproducer software provides a graphical interface that lets the user easily generate LTE-compliant waveforms.
LTE standards support the use of both Time Domain Duplex (TDD) and Frequency Domain Duplex (FDD) from the same set of standards, and with the same air interface characteristics.
Multiple Input Multiple Out (MIMO) is an antenna technology that, together with signal processing, can either increase capacity (spatial multiplexing) or signal-to-noise ratio (transmit diversity) in a radio link.
In LTE using 2x2 / 4x2 MIMO with spatial multiplexing, the user data is separated into two data sets each fed to two / four transmit antennas and received by two receive antennas. Because of multi-path, each data set travels a distinct RF path with different propagation characteristics. The algorithm used to split and recombine the data allows the system to make use of the independence of these two paths in order to improve throughput. The two data streams occupy the same RF channel at the same time. This doubles the data rate possible on the air interface link.
When using MIMO with transmit diversity, the same user data is transmitted from both antennas, and at each receiver, replicas of the signal are processed. This duplication enhances signal-to-noise ratio and improves signal robustness.