Channel estimates of the speed available to users on OFDM-MIMO systems

In this paper, a Massive MIMO system consists of a base station (BS) and several users. In this system, users send their information in a frequency-time source. For simplicity and cheapness, devices are single-antenna users. BS uses MRC, ZF and MMSE to detect user information. These receivers are relatively close to optimal performance due to the large number of BS antennas. BS needs to be aware of channel conditions to reveal users information. Under these conditions, we first calculate the speed of each user by assuming accurate channel information in the BS, then we can examine the available speed in real conditions and by estimating the channel. To estimate the channel, we use orthogonal triangles with a minimum length of time equal to the number of users, and we show that by increasing the number of antennas in the BS, we can eliminate the effect of the channel estimation and reach the desired speeds. In the last section we present the simulation results and compare the two states.

کلیدواژه ها:

Massive MIMO ، Acceptable Speed ، Channel Estimation