Impulse Symbol Based Channel Estimation in OFDM Systems

Chang, Namseok; Kang, Joonhyuk

doi:10.1109/pimrc.2006.254364

Cited by 13 publications

(13 citation statements)

References 8 publications

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“…Note that the data rates are fixed for fair comparison of the BER performance. In the simulation, it is assumed that the IP-OFDM signal with N = 256 and L 1 = 64 are transmitted over the multipath channels, where the length of CIR is a random variable uniformly distributed on [1,65]. The length of IP is adaptively varied for the system with the proposed scheme while the length of IP is fixed with L 2 = 64 for the conventional system.…”

Section: Simulation Results and Discussion Of The Adaptive Schemementioning

confidence: 99%

“…The IP-OFDM proposed in [1,2] is a modified OFDM system, which adds an impulse sample and several zero samples at the end of a ZP-OFDM symbol block for time-domain channel estimation. The simplified block diagram for the transmitter part of IP-OFDM system is shown in Figure 1.…”

Section: System Descriptionmentioning

confidence: 99%

“…An impulse postfix orthogonal frequency division multiplexing (IP-OFDM) system, which performs channel estimation in time domain by exploiting the IP instead of pilot tones, has recently been introduced [1,2]. The IP-OFDM system exploits the IP, which consists of a high power impulse sample and several zero samples at the end of a zero padded-OFDM (ZP-OFDM) [3] symbol block, to estimate channel impulse response (CIR) in time domain.…”

Section: Introductionmentioning

confidence: 99%

“…The IP-OFDM system exploits the IP, which consists of a high power impulse sample and several zero samples at the end of a zero padded-OFDM (ZP-OFDM) [3] symbol block, to estimate channel impulse response (CIR) in time domain. As shown in [1,2], without loss of data rates, the IP-OFDM system achieves the enhanced bit error rate (BER) performance compared with that of conventional OFDM systems.…”

Section: Introductionmentioning

confidence: 99%

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The impact of impulse postfix length on the BER performance of IP‐OFDM systems

Lee

Kim

2011

Int J Communication

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SUMMARYThe impulse postfix OFDM (IP-OFDM) system exploits the IP, which consists of a high power impulse sample and several zero samples at the end of a zero padded-OFDM symbol block, to estimate channel impulse response (CIR) in time domain. In this paper, the impact of IP length on the BER performance of the IP-OFDM system is analyzed. According to the analytic results, the BER performance can be significantly degraded with both a shorter length of IP as well as a longer length of IP than that of the CIR. Thus, an adaptive IP scheme, which adjusts the length of IP adaptively depending on the length of CIR, is proposed to enhance the BER performance of IP-OFDM systems and its effectiveness is demonstrated by computer simulations. The BER performance of the IP-OFDM systems with the proposed adaptive scheme is compared with that of the conventional IP-OFDM system over various modulation schemes. Simulation results show that the IP-OFDM with the proposed scheme can achieve about 2 dB performance enhancement compared with that of conventional systems at BER = 10 −2 .

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Section: Simulation Results and Discussion Of The Adaptive Schemementioning

confidence: 99%

Section: System Descriptionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The impact of impulse postfix length on the BER performance of IP‐OFDM systems

Lee

Kim

2011

Int J Communication

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“…The WSN localization can be implemented by the deployment of a large number of low-cost, low-power and multi-functional sensors, which provides unprecedented opportunity for security, disaster response, monitoring, surveillance and tactical system [1]- [4] especially in the unstable surroundings [5].…”

Section: Introductionmentioning

confidence: 99%

Joint TOA/AOA-based localization in wireless sensor networks

Jeong

Sung

Lee

et al. 2014

2014 8th International Conference on Signal Processing and Communication Systems (ICSPCS)

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Wireless sensor network (WSN) localization has drawn attention in a broad spectrum of applications for security, disaster response, monitoring, surveillance and tactical system. The deployment of a large number of low-cost, low-power and multi-functional sensors is preferred, which provides an exceptional localization performance via cooperative communication.In this paper, we consider a cooperative localization in WSNs consisting of multiple anchor nodes (ANs) equipped with a linear antenna array of M elements, a single-antenna target and a central unit (CU). We focus on a synchronous network and all the channels are supposed to be frequency-flat. Our objective is to evaluate the performance of localization technique for the target's position that jointly exploits both Time-of-Arrival (TOA) and Angle-of-Arrival (AOA) measurements. We derive the Cramér-Rao bound (CRB) for a joint TOA/AOA-based localization. Additionally, for the performance comparison, the CRBs of solely TOA-and AOA-based localizations are also derived. By numerical results, our analysis is verified and it is observed that the joint TOA/AOA-based localization has a superior performance than either TOA-or AOA-based localization.Index Terms-Wireless sensor network, Time-of-Arrival (TOA), Angle-of-Arrival (AOA), Cramér-Rao bound (CRB)

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Power boosting factor determination in impulse postfix‐OFDM‐based positioning system

Zhou

Jing

Kim

2015

Int J Communication

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SUMMARYBased on recently introduced novel impulse postfix-OFDM scheme, we proposed a joint time-of-arrival/ angle-of-arrival positioning scheme, in which both channel estimation and positioning information can be realized by analyzing the channel impulse response estimated on an access point equipped with a uniform linear antenna array. However, the power boosting factor (PBF) determination of impulse postfix (IP) should be taken as an important issue, because a small PBF will result in imprecise channel estimation and deteriorate the communication quality, as well as positioning accuracy; in contrast, the huge power assignment on IP will lead to insufficient power allocated on date portion, when transmitted power is restricted, which also increases the system BER. In this paper, to obtain the optimal performance of both BER and positioning accuracy, we mathematically analyze the BER and positioning performance with increasing PBFs in the term of signal-to-noise ratio and confirm our assumption in the cases of quadrature phase-shift keying and 16-quadrature amplitude modulation, with computer simulation. The result applies that, as the PBF is increasing, the system BER is enhanced until PBF reaches 15 and starts deteriorating thereafter. According to the result, the decision criteria for determining PBF of IP should depend on practical preference of BER or positioning.

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Impulse Symbol Based Channel Estimation in OFDM Systems

Cited by 13 publications

References 8 publications

The impact of impulse postfix length on the BER performance of IP‐OFDM systems

The impact of impulse postfix length on the BER performance of IP‐OFDM systems

Joint TOA/AOA-based localization in wireless sensor networks

Power boosting factor determination in impulse postfix‐OFDM‐based positioning system

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