LTE MIMO Types of Inputs and Outputs
LTE MIMO “input” and “output” are used for medium between transmitters and receivers, including both RF components – known as the “channel”. Thus, the base station with two transmitters provides two inputs to the channel, “mi” page, and the handset takes two strings get two out of the chains, “MO” part. It is only when the data is transmitted and received independently and is not simply a copy of the same data, as explained below.
Single Input Single Output (SISO) transmission is the standard in most systems, and more complex target systems is capacity, or data rate of gain, measured in relation to SISO.
Single Input Multiple Output (SIMO) or receive diversity (a single transmitter, and therefore a single data stream), feeds two receiver chains. This helps the integrity of the data received, where the signal-to-noise (SNR) ratio is poor due to multipath fading. There is no gain in quality of the data, except any benefit that comes from the best ratio of error and consequent reduced retransmission.
Multiple Input Single Output (MISO) is a transmit diversity technique. In LTE, Space frequency block coding (SFBC) is used to improve the resistance of signal fading conditions. Transmitters send the same data to the user base, which in different places of radio frequencies.
True MIMO with two transmitters and two receivers independent of the content of the data is also known as spatial multiplexing. Each receiver sees the channel, which is a combination of results from the transmitter. Using channel receiver calculation techniques using matrix mathematics to separate the two data streams, and demodulate the data. In ideal conditions, the volume of data will be doubled, even though it is not good premium payment requirements SNR than SISO. Almost doubling the data throughput is not reached, but specific growth data quality, can be seen.