TY - JOUR
T1 - Some preamble design aspects in CP-OFDM systems
AU - Katselis, Dimitrios
N1 - Funding Information:
Manuscript received November 1, 2011. The associate editor coordinating the review of this letter and approving it for publication was N.-D. Dao. D. Katselis is with the ACCESS Linnaeus Center, School of Electrical Engineering, KTH Royal Institute of Technology, SE 100-44, Stockholm, Sweden (e-mail: dimitrik@kth.se). This work was partially supported by the Swedish Research Council under the contract 621-2010-5819. Digital Object Identifier 10.1109/LCOMM.2012.010512.112260 1According to [5], a full preamble contains nonzero pilot symbols to all tones.
PY - 2012/3
Y1 - 2012/3
N2 - A fundamental problem in training-based channel estimation for various communication systems is the preamble design. Two crucial aspects in such a design are the achievable mean square error (MSE) and the corresponding peak-to-average power ratio (PAPR). In this letter, preamble-based least squares (LS) channel estimation in CP-OFDM systems is considered. Ignoring the PAPR aspect, several MSE-optimal preambles and a necessary condition for their existence are presented. To this end, a training energy constraint, containing also the energy spent to the cyclic prefix (CP), is imposed. This constraint differs from the usual training energy constraints in the existing literature, which ignore the CP energy during training. These preambles contribute in the completion of existing results concerning MSE-optimal preambles in CP-OFDM systems. However, since high PAPR is an issue concerning these optimal designs, we show how these MSE-optimal preambles can be combined with the usual Zadoff-Chu (ZC) sequences to enlarge the class of PAPR-optimal preambles that achieve good MSE performance at the same time.
AB - A fundamental problem in training-based channel estimation for various communication systems is the preamble design. Two crucial aspects in such a design are the achievable mean square error (MSE) and the corresponding peak-to-average power ratio (PAPR). In this letter, preamble-based least squares (LS) channel estimation in CP-OFDM systems is considered. Ignoring the PAPR aspect, several MSE-optimal preambles and a necessary condition for their existence are presented. To this end, a training energy constraint, containing also the energy spent to the cyclic prefix (CP), is imposed. This constraint differs from the usual training energy constraints in the existing literature, which ignore the CP energy during training. These preambles contribute in the completion of existing results concerning MSE-optimal preambles in CP-OFDM systems. However, since high PAPR is an issue concerning these optimal designs, we show how these MSE-optimal preambles can be combined with the usual Zadoff-Chu (ZC) sequences to enlarge the class of PAPR-optimal preambles that achieve good MSE performance at the same time.
KW - Cyclic prefix
KW - Least squares
KW - Orthogonal frequency division multiplexing (OFDM)
KW - Preamble
KW - Zadoff-Chu sequences
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U2 - 10.1109/LCOMM.2012.010512.112260
DO - 10.1109/LCOMM.2012.010512.112260
M3 - Article
AN - SCOPUS:84858342215
SN - 1089-7798
VL - 16
SP - 356
EP - 359
JO - IEEE Communications Letters
JF - IEEE Communications Letters
IS - 3
M1 - 6126080
ER -