Paper Info
Title
Adaptive Modulation and Turbo Coding for 3GPP LTE Systems with Limited Feedback
Abstract
Link adaptation is recognized as a powerful tech- nique for enhancing spectral efficiency over wireless channels. While its theoretical aspects are well understood, it is not clear yet how to practically deal with limited feedback. In this paper, we study a frequency-selective link adaptation scheme for orthogonal frequency division multiplexing (OFDM). The modulation order is adjusted per resource block (smallest time-frequency unit assigned to a user), while a joint coding rate is used for all variable-length codewords, comprising resource blocks with different modulations. In order to meet the required coding rate, adaptive puncturing is applied after a fixed-rate Turbo encoder. Link adaptation is guided by an effective signal-to-noise ratio (SNR), which is calculated over several subcarriers by a mapping function. 3GPP LTE compliant link-layer simulations were performed for optimizing the SNR interface so that the spectral efficiency is maximized under a codeword error rate constraint and tradeoffs between feedback savings and spectral efficiency losses were elaborated. The result is a thoroughly tested link-layer abstraction for 3GPP LTE including adaptive modulation and bit-interleaved coding that can be also used for system-level simulations towards future mobile radio systems.
Year
DOI
Venue
2014
10.1109/VTCSpring.2014.7022809
Vehicular Technology Conference
Keywords
Field
DocType
3G mobile communication,Long Term Evolution,OFDM modulation,adaptive modulation,interleaved codes,telecommunication links,turbo codes,variable length codes,wireless channels,3GPP LTE systems,OFDM,SNR,adaptive modulation,bit-interleaved coding,codeword error rate,frequency-selective link adaptation scheme,joint coding rate,mobile radio systems,orthogonal frequency division multiplexing,signal-to-noise ratio,spectral efficiency,turbo coding,variable-length codewords,wireless channels
Link adaptation,Radio resource management,Modulation order,Code rate,Computer science,Turbo code,Electronic engineering,Spectral efficiency,Orthogonal frequency-division multiplexing,Puncturing
Conference
ISSN
Citations 
PageRank 
1550-2252
3
0.41
References 
Authors
9
3
Name
Order
Citations
PageRank
Konstantinos Manolakis125419.09
Miguel Angel Gutierrez-Estevez231.43
Volker Jungnickel365384.68