Semi-Blind Channel Estimation and PAR Reduction for MIMO-OFDM System With Multiple Antennas

Baek, Myung-Sun; Kim, Mi-Jeong; You, Young-Hwan; Song, Hyoung‐Kyu

doi:10.1109/tbc.2004.837885

Cited by 83 publications

(47 citation statements)

References 21 publications

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“…The SNR difference between LS and perfect channel estimations is 3 dB. Therefore, one can expect that a sophisticated channel estimation scheme additionally improves the performance [23,24]. More importantly, it is apparent that the theoretical results of fine frequency estimator according to Eq.…”

Section: Simulation Resultsmentioning

confidence: 96%

Pilot-Less Synchronization Receiver for Uwb-Based Wireless Application

Kim¹,

You²,

Lee³

et al. 2008

PIER

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Abstract-This paper suggests a pilot-less residual carrier frequency offset (CFO) estimator for ultra-wideband orthogonal frequency division multiplexing (UWB-OFDM) systems. The basic idea of our approach is based on the fact that two adjacent OFDM symbols carry the identical information in the UWB-OFDM system, thus removing the need of pilot symbols. To demonstrate the efficiency of the proposed pilot-less CFO estimator, analytical expression of the mean square error (MSE) is reported and comparisons are made with the conventional pilot-aided CFO estimator in terms of MSE and throughput.

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Section: Simulation Resultsmentioning

confidence: 96%

Pilot-Less Synchronization Receiver for Uwb-Based Wireless Application

Kim¹,

You²,

Lee³

et al. 2008

PIER

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“…A first extension for multi-antenna point-topoint scenarios has been presented in [7] and named ordinary SLM (oSLM). However, this approach is nothing else than a straightforward application of singleantenna SLM to each transmit antenna.…”

Section: Review Of Selected Mapping In Multi-antenna Environmentsmentioning

confidence: 99%

“…Possible extensions for the popular scheme SLM have been proposed in [7][8][9]. However, in many cases these extensions have only been discussed for multi-antenna point-to-point scenarios where the equalization of the multi-antenna interferences can be accomplished at the receiver side.…”

Section: Introductionmentioning

confidence: 99%

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Selected basis for PAR reduction in multi-user downlink scenarios using lattice-reduction-aided precoding

Siegl

Fischer

2011

EURASIP J. Adv. Signal Process.

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The application of OFDM within a multi-user downlink scenario is considered. Thereby, two problems occur. First, due to OFDM, the transmit signal exhibits a large peak-to-average power ratio (PAR). Second, the multi-user interferences have to be equalized (or precoded) at the transmitter side. In this article, we address combined precoding and PAR reduction. As precoding schemes sorted Tomlinson-Harashima precoding (sTHP) and its latticereduction-aided variant (LRA-THP) are considered. In order to reduce the PAR, we review the scheme selected sorting (SLS), which is a combined approach of PAR reduction and precoding with sTHP. Based on this idea, the novel PAR reduction scheme selected basis (SLB) is introduced which combines PAR reduction with the precoding approach LRA-THP. It can be shown that SLB achieves very good PAR reduction performance and hardly influences the error performance. Both schemes, SLB and SLS, are compared with simplified selected mapping (sSLM), the only PAR reduction scheme from the SLM family, which can be applied in multi-user downlink scenarios. The comparison is done on the basis that the respective schemes exhibit the same computational complexity. In terms of PAR reduction performance, it turns out that sSLM outperforms SLS, whereas the performance of sSLM and SLB is similar. Noteworthy, the great benefit of SLB or SLS is that no side information has to be communicated to the receiver as it is necessary with sSLM. Moreover, using SLB, full diversity error rate performance is possible with only low-PAR transmit signals.

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“…It is for this reason that several research works were interested in the PAPR reduction by applying existing single input single output (SISO) algorithms separately on each transmit antenna such as ordinary selected mapping (SLM) [7] and partial transmit sequence (PTS) techniques [8]. Such techniques need a number of side information (SI) equal to the number of used sequence phase for each antenna.…”

Section: Introductionmentioning

confidence: 99%

PAPR reduction scheme with efficient embedded signaling in MIMO-OFDM systems

Sghaier¹,

Abdelkefi²,

Siala³

2015

J Wireless Com Network

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Multiple input multiple output (MIMO) orthogonal frequency division multiplexing (OFDM) is a promising transmission scheme for high performance broadband wireless communications. However, this technique suffers from a major drawback which is the high peak to average power ratio (PAPR) of the output signals. In order to overcome this issue, several methods requiring the transmission of explicit side information (SI) bits have been proposed in the literature. In fact, the transmitted bits must be channel-encoded as they are particularly critical to the performance of the considered OFDM system. Consequently, this channel-encoding highly increases the system complexity and decreases the transmission data rate. To overcome these problems, we propose in this paper two robust blind techniques that embed the SI implicitly into the OFDM frame. The first technique, referred to as Blind Space Time Bloc Codes (BSTBC), is inspired from the conventional selected mapping (SLM) approach. This technique banks on an adequate embedded signaling that mainly consists in a specific Space Time Bloc Codes (STBC) patterns and a precoding sequence codebook. In addition, in order to improve the signal detection process and the PAPR gain, we propose a new efficient combined Blind SLM-STBC (BSLM-STBC) method. Both methods propose an optimized scheme during the signal estimation process that is based on the maximum a posteriori (MAP) algorithm. A simulation study shows that our investigated approaches result in a spectacular PAPR reduction and furthermore lead to a perfect signal recovery at the receiver side.

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Semi-Blind Channel Estimation and PAR Reduction for MIMO-OFDM System With Multiple Antennas

Cited by 83 publications

References 21 publications

Pilot-Less Synchronization Receiver for Uwb-Based Wireless Application

Pilot-Less Synchronization Receiver for Uwb-Based Wireless Application

Selected basis for PAR reduction in multi-user downlink scenarios using lattice-reduction-aided precoding

PAPR reduction scheme with efficient embedded signaling in MIMO-OFDM systems

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