In this paper, a method to optimize packet length for two way relaying systems is suggested. Two source nodes N1 and N2 are transmitting data simultaneously to each other through a selected relay. The relay amplifies the sum of N1 and N2 signals. N1 (respectively N2) retrieves its own signal to be able to detect that of node N2 (respectively N1). In the existing literature, a Fixed Packet Length (FPL) is used and it is demonstrated, in this paper, that the proposed Optimal Packet Length (OPL) allows to enhance the system throughput. © 2019 IEEE.

Kamran Arshad

Department of Electrical and Computer Engineering

College of Engineering and Information Technology

G. Alnwaimi

H. Boujemaa

Optimal packet length

Rayleigh fading channels

Two Way Relaying (TWR) Cooperative systems

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Ajman University

Packet Length Optimization for Two Way Relaying

2019 15th International Wireless Communications and Mobile Computing Conference, IWCMC 2019

The maturing massive multiple-input multiple-output (MIMO) literature has provided asymptotic limits for the rate and energy efficiency (EE) of maximal ratio combining/maximal ratio transmission (MRC-MRT) relaying on two-way relays (TWRs) using the amplify-and-forward (AF) principle. Most of these studies consider time-division duplexing and a fixed number of users. To fill the gap in the literature, we analyze the MRC-MRT precoder performance of an N-antenna AF massive MIMO TWR, which operates in a frequency-division duplex mode to enable two-way communication between 2M= N α single-antenna users, with α in [0,1), divided equally into two groups of M users. We assume that the relay has realistic imperfect uplink channel state information (CSI), and that quantized downlink CSI is fed back by the users relying on B ≥ 1 bits per-user per relay antenna. We prove that for such a system with α\in [0,1), the MRC-MRT precoder asymptotically cancels the multi-user interference (MUI) when the supremum and infimum of large-scale fading parameters are strictly non-zero and finite, respectively. Furthermore, its per-user pairwise error probability converges to that of an equivalent AWGN channel, as both N and the number of users 2M= N tend to infinity, with a relay power scaling of P r =(2ME r /N) and E r being a constant. We also derive upper bounds for both the per-user rate and EE. We analytically show that the quantized MRC-MRT precoder requires as few as B=2 bits to yield a BER, EE, and per-user rate close to the respective unquantized counterparts. Finally, we show that the analysis developed herein to derive a bound on α for MUI cancellation is applicable both to Gaussian as well as to any arbitrary non-Gaussian complex channels. © 1972-2012 IEEE.

Fulltext

IEEE Transactions on Communications

Analysis of Quantized MRC-MRT Precoder for FDD Massive MIMO Two-Way AF Relaying

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Packet length optimization for two way relaying

Journal	Data powered by Typeset2019 15th International Wireless Communications and Mobile Computing Conference, IWCMC 2019
Publisher	Data powered by TypesetInstitute of Electrical and Electronics Engineers Inc.
Open Access	No