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We describe multi-user MIMO systems with limited feedback precoding. To achieve the capacity of a multi-user MIMO channel, the accurate channel state information must be available at the transmitter. Because the channel state information is fed back from each UE, higher accuracy in feedback information requires larger uplink resource. A receiver in practical system is unable to feed back the perfect channel state information to the transmitter because of uplink resource limitation. Instead, a receiver feeds back the partial channel state information, which improve the efficiency of the uplink resource use. We define such system as the Multi-user MIMO system with limited feedback precoding.

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  • Digital Feedback
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  • We describe multi-user MIMO systems with limited feedback precoding. To achieve the capacity of a multi-user MIMO channel, the accurate channel state information must be available at the transmitter. Because the channel state information is fed back from each UE, higher accuracy in feedback information requires larger uplink resource. A receiver in practical system is unable to feed back the perfect channel state information to the transmitter because of uplink resource limitation. Instead, a receiver feeds back the partial channel state information, which improve the efficiency of the uplink resource use. We define such system as the Multi-user MIMO system with limited feedback precoding.
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abstract
  • We describe multi-user MIMO systems with limited feedback precoding. To achieve the capacity of a multi-user MIMO channel, the accurate channel state information must be available at the transmitter. Because the channel state information is fed back from each UE, higher accuracy in feedback information requires larger uplink resource. A receiver in practical system is unable to feed back the perfect channel state information to the transmitter because of uplink resource limitation. Instead, a receiver feeds back the partial channel state information, which improve the efficiency of the uplink resource use. We define such system as the Multi-user MIMO system with limited feedback precoding. The received signal in MIMO BC with limited feedback precoding at UE is mathematically described as Since the transmit vector for limited feedback precoding is where is the error vector caused by the limited feedback such as quantization, the received signal can be rewritten as where is the residual interference according to the limited feedback precoding. To reduce this interference, we should use the higher accuracy channel information feedback which results in decreasing the uplink resource.
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