What is it about?

It has been proven that compared to the conventional approach, using a cross-layer framework based on the combining AMC and ARQ across the physical and link layer, provides a better performance over wireless links. Here, we want to employ a low-complexity slow adaptive scheme by exploiting massive MIMO regime. In this way, the performance is evaluated by MRC receiver which rarely has been investigated in previous works.

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Why is it important?

1. We derive an approximated PDF of the user signal-to interference- plus-noise ratio (SINR) at the BS and verify its accuracy using simulation tools. In this derivation, the user’s channel to a given BS is modeled using a combination of Rayleigh fading, shadowing, and path loss. 2. By employing a truncated type-I HARQ protocol at the data link layer, we present a cross-layer design for rate adaptation at the physical layer. In particular, we provide analytical expressions for the throughput and packet error outage (PEO) of the system for both proposed FAMC and SAMC schemes. 3. We present extensive numerical results to evaluate the performance of the proposed AMC design. In particular, considering different coherence times for users’ channels (different packet lengths), the throughput and PEO of the system are evaluated for different numbers of packet retransmission, B.S antennas, and active users. The comparison between the performance of FAMC and SAMC schemes is provided in different situations.


Regarding that nowadays, the challenge of system complexity in massive antennas is highly important specially in current and also next wireless network generation, I hope this article can help and light the way.

Amin Radbord

Read the Original

This page is a summary of: Slow and fast adaptive modulation and coding for uplink massive MIMO systems with packet retransmission, IET Communications, April 2022, the Institution of Engineering and Technology (the IET), DOI: 10.1049/cmu2.12389.
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