DocumentCode :
1373575
Title :
Diversity-Multiplexing Tradeoff Analysis for OFDM Systems With Subcarrier Grouping, Linear Precoding, and Linear Detection
Author :
Prasad, Narayan ; Venturino, Luca ; Wang, Xiaodong
Author_Institution :
NEC Labs. America, Princeton, NJ, USA
Volume :
56
Issue :
12
fYear :
2010
Firstpage :
6078
Lastpage :
6096
Abstract :
We consider the use of linear constellation precoding and linear detection in a multicarrier OFDM system with multiple receive antennas to obtain improved performance over multipath fading channels at a low complexity. We split the full set of subcarriers into smaller groups and spread the data symbols assigned to each group via precoding matrices. We adopt the diversity-multiplexing tradeoff (DMT) framework and derive the DMT-optimal split of the subcarriers (DMT-optimal grouping) and the DMT-optimal number of symbols assigned to each group (DMT-optimal symbol loading). We determine necessary and sufficient precoder design conditions to achieve DMT optimality and give specific constructions of such precoders. Next, we consider a multiuser OFDMA system and derive an algorithm which divides the available subcarriers among the active users in order to maximize the diversity order of the system (or joint) error probability. We also extend our analysis to OFDM systems equipped with multiple transmit antennas. Finally, we obtain important insights on the role of outer codes in an OFDM system employing linear precoding and linear equalization.
Keywords :
OFDM modulation; diversity reception; equalisers; fading channels; frequency division multiple access; multipath channels; multiuser detection; precoding; probability; receiving antennas; transmitting antennas; DMT; OFDM; OFDMA; diversity multiplexing tradeoff; error probability; linear constellation precoding; linear detection; linear equalization; multipath fading channels; multiple receive antennas; multiple transmit antennas; multiuser detection; subcarrier grouping; Algorithm design and analysis; Complexity theory; Error probability; OFDM; Receiving antennas; Diversity-multiplexing tradeoff; linear detection; linear precoding; orthogonal frequency-division multiple access (OFDMA); orthogonal frequency-division multiplexing (OFDM); subcarrier grouping;
fLanguage :
English
Journal_Title :
Information Theory, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9448
Type :
jour
DOI :
10.1109/TIT.2010.2079552
Filename :
5625643
Link To Document :
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