Title :
Green Resource Allocation Schemes for Relay-Enhanced MIMO-OFDM Networks
Author :
Tain-Sao Chang ; Kai-Ten Feng ; Jia-Shi Lin ; Li-Chun Wang
Author_Institution :
Dept. of Electr. & Comput. Eng., Nat. Chiao Tung Univ., Hsinchu, Taiwan
Abstract :
This paper studies the problem of joint allocation of subchannel, transmission power, and phase duration in relay-enhanced bidirectional multiple-input-multiple-output orthogonal frequency-division multiplexing (MIMO-OFDM) networks. The goal of resource allocation is to minimize transmission energy consumption in networks with multiple decode-and-forward relay stations (RSs) under the data rate constraints of user equipment (UE). The challenges of this resource allocation problem arise from the complication of multiple-phase assignments within a subchannel since the RS can provide an additional transmission path from the base station to the UE. Existing research does not fully take into account all of the influential factors to achieve feasible resource allocation for relay-enhanced MIMO-OFDM networks. Green resource allocation (GRA) schemes with reduced computational complexity are proposed in this paper to develop joint allocation of subchannel, power, and phase duration for the UE with the consideration of direct and two-hop communications. Both the separate-downlink (DL)-and-uplink (UL) and mixed-DL-and-UL relaying assignments and the linear block diagonalization (LBD) technique are adopted to obtain the solutions for the proposed GRA schemes. Simulation results show that the proposed GRA schemes can provide comparably better energy conservation with the consideration of quality-of-service (QoS) support.
Keywords :
MIMO communication; OFDM modulation; channel allocation; computational complexity; decode and forward communication; quality of service; relay networks (telecommunication); GRA scheme; LBD technique; QoS support; UE data rate constraint; decode-and-forward RS; decode-and-forward relay stations; direct communication; energy conservation; green resource allocation scheme; linear block diagonalization technique; mixed DL-UL relaying assignment; multiple-input-multiple-output network; multiple-phase assignment; orthogonal frequency-division multiplexing network; phase duration allocation; quality-of-service; reduced computational complexity; relay-enhanced bidirectional MIMO-OFDM network; separate-downlink-uplink relaying assignment; subchannel allocation; transmission energy consumption minimization; transmission path; transmission power allocation; two-hop communication; user equipment; Green products; Joints; MIMO; OFDM; Quality of service; Resource management; Throughput; Energy conservation; linear block diagonalization (LBD); multiple-input multiple-output orthogonal frequency-division multiplexing (MIMO-OFDM); relay station (RS); resource allocation;
Journal_Title :
Vehicular Technology, IEEE Transactions on
DOI :
10.1109/TVT.2013.2265779