20/11/2007 · Ofdm Thesis PDF - Free download as ..
This thesis focuses on single–user MIMO mode in 3GPP LTE downlink ..
We first show that this energy-efficient resource allocation problem can be converted into a more tractable equivalent problem by which the fractional objective of energy efficiency is well settled. With the Lagrange dual method then, we decouple the RB assignment and power allocation on different subchannels using dual decomposition, which greatly simplifies the combinatorial RB assignment, and address the equivalent problem effectively via solving a series of dual optimization problems. Moreover, a computationally efficient but near-optimal algorithm is proposed to perform QoS-aware energy-efficient resource allocation in practice. Simulation results show that our proposed algorithm may not only improve energy efficiency significantly but fully satisfy users’ rate requirements as well. Moreover, with MIMO-OFDMA and RB assignment being considered, the proposed algorithm may be more applicable in LTE systems than most existing schemes on energy-efficient resource allocation.
Performance of MIMO Aware RRM in Downlink OFDMA
Broadband mobile communication has enabled MIMO technology and OFDM technology to become the most promising research direction in the field of wireless mobile communication in the future. OFDMA technology growing up based on OFDM is a multiple-access technology, whose channel design will generate more influence for system capability. OFMDA technology can apply suitable channel design for bringing about high efficiency communication in allusion to different environment. And the channel could select or device a better estimator algorithm by algorithm t- heory to enhance communication reliability ().