MIMO In 4G Wireless Communications(2)

MIMO In 4G Wireless Communications(2)

4G Communications 

MIMO Schemes in LTE-Advanced:

 In order to support downlink peak spectrum efficiency of 30 bps/Hz and

uplink peak spectrum efficiency of 15 bps/Hz according to LTE-Advanced

requirement, the spatial multiplexing with antenna configuration of 8 × 8 for

downlink transmission and 4 × 4 for uplink transmission is being investigated.

Here N × N denotes a configuration of N transmit antennas and N receive

antennas. In addition to meeting the peak spectrum efficiency, further

improvement of the average cell throughput as well as the cell edge performance is also an important aspect of the LTE-advanced study. 

Coordinated multipoint transmission/reception is a candidate technology

where antennas of multiple cell sites are utilized in a way such that the

transmit/receive antennas of the serving cell as well as the neighboring cells can contribute in improving quality of the received signal at the UE/eNodeB, as well as in reducing the co-channel interferences from neighboring cells.

The application of coordinated multipoint transmission, For a downlink transmission scenario. An example scheme is to form a beam to the schedule UE by using the transmit antennas of the cells 1, 2, and 3, where each cell transmits the same data to the scheduled UE and the UE-specific reference signal is used for support of demodulation at the UE. For the cells 1, 2, and 3 to jointly form the transmit signal matching to the composite channel

experienced by the UE, it may be necessary to provide feedback representing the downlink spatial channel of each cell without any pre-assumption on operation at the eNodeB transmitter and the UE receiver. The feedback for explicit representation of the spatial channel of each cell may naturally require much larger overhead than the feedback defined in LTE such as CQI, PMI

Performance:

LTE downlink SU-MIMO performance

Relation between data throughput & coverage in different number of ranks

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MIMO in 4G Single Cell Systems  intro to MIMO in 4G Cellular Systems 1st & 2nd Generations  2nd Generation Standards MIMO in 4G Phases

Communication System Systems Communications Wireless 4G