A Sub-optimal Eigenvalue-Based Adaptive Modulation Scheme for Broadband MIMO-OFDM Systems

Author

Gidlund, Mikael

Author_Institution

Nera Networks, Bergen

fYear

2008

fDate

5-8 May 2008

Firstpage

53

Lastpage

58

Abstract

The ability to provide high data rate is a key measure in 3GPP long term evolution (LTE). Multiple input multiple output (MIMO) has emerged as an technique that increases the data rates in 3G systems. In this paper we study MIMO-OFDM system based on adaptive modulation and investigate the preceding technology. We present a method for adaptive modulation based on eigenvalues and a preceding matrix will be used at the transmitter according to singular value decomposition. A low complexity ratio-based algorithm with good performance is proposed to decide which modulation scheme to be used. The achieved results show that the proposed scheme outperforms basic beamforming with adaptive modulation.

Keywords

3G mobile communication; MIMO communication; OFDM modulation; broadband networks; eigenvalues and eigenfunctions; matrix algebra; singular value decomposition; 3GPP LTE; broadband MIMO-OFDM systems; long term evolution; low complexity ratio-based algorithm; multiple input multiple output systems; orthogonal frequency division multiplexing; preceding matrix; singular value decomposition; sub-optimal eigenvalue-based adaptive modulation; Array signal processing; Diversity reception; Eigenvalues and eigenfunctions; Feedback; MIMO; Matrix decomposition; Narrowband; OFDM modulation; Singular value decomposition; Transmitters; Adaptive Modulation; MIMO; OFDM; SNR;

fLanguage

English

Publisher

ieee

Conference_Titel

Communication Networks and Services Research Conference, 2008. CNSR 2008. 6th Annual

Conference_Location

Halifax, NS

Print_ISBN

978-0-7695-3135-9

Type

conf

DOI

10.1109/CNSR.2008.19

Filename

4519839