Performance of MIMO Techniques to Achieve Full Diversity and Maximum Spatial Multiplexing (original) (raw)

Progress Report on MIMO Research : Spring 2006

2005

In the Spring 2006 quarter we investigated BBO, which is a combination of BICM, single beamforming, and OFDM. We showed that BBO achieves full diversity in space and frequency regardless of the power delay profile (PDP) of the channel. Since only one stream of data is transmitted over all transmit antennas, a simple interleaver is shown to be sufficient to achieve full space and frequency diversity. Simulation results show that beamforming-based systems introduce substantial coding gain, even with partial channel state information at the transmitter (CSIT), when compared to other systems based on space time block codes (STBC) with the same full diversity order. In addition, we show through simulations that reduction of CSIT from full resolution to only one bit per tone results in an SNR reduction of only about 1.5-2 dB.

Spatial Multiplexing in Modern Mimo Systems

2016

Digital communication using multiple-input-multiple-output (MIMO) has been regarded as one of the most significant technical breakthrough modern communications. Beside, several different open loop MIMO systems include, Spatial Multiplexing (SM) to provide diversity gain and increase the reliability of wireless links. Under suitable channel fading conditions, having both multiple transmit and multiple receive antennas (i.e., a MIMO channel) provides an additional spatial dimension for communication and yields a degree-of-freedom gain. These additional degrees of freedom can be exploited by spatially multiplexing several data streams onto the MIMO channel, and lead to an increase in the capacity: the capacity of such a MIMO channel with n transmit and receive antennas is proportional to n. Index Terms-Diversity, spatial multiplexing(SM or SMX) , , MIMO, SIC, ML, ZF..