Low-complexity energy-efficient resource allocation for delay-tolerant two-way orthogonal frequency-division multiplexing relays

Tiantian Yu; Yanliang Jin; Weisi Guo; Changli Fang; Wei Deng; Tao Wang

Low-complexity energy-efficient resource allocation for delay-tolerant two-way orthogonal frequency-division multiplexing relays

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Author(s): Tiantian Yu ¹ ; Yanliang Jin ¹ ; Weisi Guo ² ; Changli Fang ¹ ; Wei Deng ¹ ; Tao Wang ¹
- Affiliations: 1: School of Communication and Information Engineering, Shanghai University, Shanghai, People's Republic of China ;
  2: School of Engineering, University of Warwick, Coventry, UK
Source: Volume 10, Issue 17, 24 November 2016, p. 2488 – 2495
DOI: 10.1049/iet-com.2015.1075 , Print ISSN 1751-8628, Online ISSN 1751-8636

Received 15/11/2015, Accepted 12/08/2016, Revised 29/07/2016, Published 24/11/2016

Energy-efficient wireless communication is important for wireless devices with a limited battery life and cannot be recharged. In this study, a bit allocation algorithm to minimise the total energy consumption for transmitting a bit successfully is proposed for a two-way orthogonal frequency-division multiplexing relay system, whilst considering the constraints of quality-of-service and total transmit power. Unlike existing bit allocation schemes, which maximise the energy efficiency (EE) by measuring ‘bits-per-Joule’ with fixed bidirectional total bit rates constraint and no power limitation, their scheme adapts the bidirectional total bit rates and their allocation on each subcarrier with a total transmit power constraint. To do so, they propose an idea to decompose the optimisation problem. The problem is solved in two general steps. The first step allocates the bit rates on each subcarrier when the total bit rate of each user is fixed. In the second step, the Lagrangian multipliers are used as the optimisation variants, and the dimension of the variant optimisation is reduced from 2N to 2, where N is the number of subcarriers. They also prove that the optimal point is on the bounds of the feasible region, thus the optimal solution could be searched through the bounds.

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Low-complexity energy-efficient resource allocation for delay-tolerant two-way orthogonal frequency-division multiplexing relays

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