Limited CSI feedback based on an adaptive codebook for temporally correlated MISO fading channels

To increase the link capacity and reliability, the use of channel state information at the transmitter in multi-antenna systems is often discussed in current research. Such information is often obtained via a feedback link which is usually limited by rate constraints. In this paper, we propose a novel scheme to quantize the channel direction vector by exploiting the temporal correlation for MISO fading channels. With the same amount of feedback bits, our proposed scheme achieves a significant capacity gain on the forward link compared to conventional quantization techniques. This gain increases with decreasing channel dynamics.