Delay Performance of Wireless Communications with Imperfect CSI and Finite Length Coding

Understand

With the rise of critical machine-to-machine applications, next generation wireless communication systems must be designed with strict constraints on the latency and reliability.

• A key question in this context relates to channel state estimation, which allows the transmitter to adapt the code rate to the channel.
• In this work, we characterize the trade-off between the estimation sequence length and data codeword length: shorter channel estimation leaves more time for the actual payload transmission but reduces the estimation accuracy and causes more decoding errors.
• Using lower coding rates can mitigate this effect, but may result in a higher backlog of data at the transmitter.