Novel Techniques of Single-CarrierFrequency-Domain Equalization for Optical Wireless Communications

Acolatse, Kodzovi; Bar-Ness, Y.; Wilson, Sarah Kate

doi:10.1155/2011/393768

Cited by 40 publications

(45 citation statements)

References 33 publications

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“…symmetry is seen in the generated time-domain signal as only odd subcarriers contained the data by vector Xk.. Half wave symmetry offers the advantage that clipping causes no loss of information as information is retained in the second half of the sample as it is in the first N/2 samples. Unipolar signal is produced by clipping [8]. Intermodulation is a serious complication caused by clipping in which sum and difference frequencies which do not exist in the original signal are generated as different signals mix.…”

Section: See-ofdm Transmittermentioning

confidence: 99%

Energy Efficiency of Visible Light Communication using SEE-OFDM

Rizwan¹,

Abdulaziz²

2016

IJCIS

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Section: See-ofdm Transmittermentioning

confidence: 99%

Energy Efficiency of Visible Light Communication using SEE-OFDM

Rizwan¹,

Abdulaziz²

2016

IJCIS

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“…A number of techniques have been reported to address the high PAPR in optical OFDM [12]- [15]. Recently, single carrier frequency division multiple accesses (SC-FDMA) was adopted for the IM/DD based VLC system to improve PAPR [16]- [18]. A LED array with SC-FDMA was implemented in [16] to reduce OFDM PAPR on VLC at a cost of the transmission rate per LED transmitter due to the interleaving and localized mapping implementation.…”

Section: Introductionmentioning

confidence: 99%

“…A LED array with SC-FDMA was implemented in [16] to reduce OFDM PAPR on VLC at a cost of the transmission rate per LED transmitter due to the interleaving and localized mapping implementation. ACO-single carrier frequency domain equalization (ACO-SCFDE) and repetition and clipping optical SCFDE (RCO-SCFDE), were presented in [17] and [18] respectively as two modified SC-FDMA schemes with the same data rates per single LED transmitter (Tx) as in ACO-OFDM. The only difference between ACO-SCFDE and the traditional ACO-OFDM is the additional FFT and IFFT blocks at the Tx and the Rx, respectively.…”

Section: Introductionmentioning

confidence: 99%

“…The first block is used to transmit the real positive samples, whereas the negative real samples are transmitted by the second block. Thus achieving reduced IFFT length compared to ACO-SCFDE [17], [18]. However, in order to present a real OFDM signal all the above modified SC-FDMA schemes must adhere to HS, which leads to higher PAPR compared to SC-FDMA in the radio frequency (RF) domain since only half of the OFDM subcarriers enjoy the mapping feature [16].…”

Section: Introductionmentioning

confidence: 99%

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Single carrier optical FDM in visible light communication

Saied

Ghassemlooy

Kızılırmak

et al. 2016

2016 10th International Symposium on Communication Systems, Networks and Digital Signal Processing (CSNDSP)

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Abstract-Light emitting diodes (LEDs) used in visible light communications (VLC) have a limited optical power-current linear range, which could be a problem in multi-level and multicarrier frequency modulation schemes. Orthogonal frequency division multiplexing (OFDM) as a popular scheme in VLC suffers from nonlinear distortion due to the high peak to average power ratio (PAPR). In this paper, we present a novel single carrier optical frequency division multiplexing signaling scheme for VLC, where the symmetrical characteristics of single carrier frequency division multiple access is investigated in order to reduce PAPR. Simulation results show that PAPR reduced by 10 dB compared to the traditional asymmetrically clipped optical OFDM. We show that the bit-error-rate performance of the proposed scheme is enhanced compared to ACO-OFDM when the limited dynamic range of digital to analog converter and LED is considered.

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“…The paper "Novel Techniques of Single Carrier Frequency Domain Equalization for Optical Wireless Communications" by Acolaste, Bar-Ness, and Wilson [5] investigates the application of single-carrier frequencydomain equalization to diffuse optical wireless communications and demonstrates its advantages over OFDM in terms of reduced PAPR and improved error rate in the presence of LED nonlinearity.…”

mentioning

confidence: 99%

Advances in single carrier block modulation with frequency domain processing

Bar-Ness

Adachi

Dhahir

et al. 2012

EURASIP J. Adv. Signal Process.

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This special issue focuses on single carrier block modulation (SC-BM) with frequency domain processing. This class of modulation and multiple access schemes complements the orthogonal frequency division multiple access (OFDMA) and its variations. For example, LTE (the long term evolution of the 3GPP standard), and LTE-Advanced, employ OFDMA in the downlink (base stations to mobiles) and SC-FDMA, a version of SC-BM in the uplink (mobiles to base stations). The main reason for adapting the technology of SC-FDMA for uplink LTE is the fact that OFDMA has high "peak-to-average power ratio" (PAPR), which is a disadvantage for mobile devices that are limited by power availability. Besides its advantage of low PAPR, SC-BM technology has a similar performance/complexity to that of OFDMA, and simple frequency domain equalization methods for combating dispersive channels.There were 17 papers submitted to this special issue. All had merits, but the review process reduced the number of accepted papers to 9. The accepted papers cover a number of novel and advanced aspects of single carrier block modulation with frequency domain processing: near-optimal nonlinear and iterative equalization techniques; applications to CDMA, MIMO and ARQ; channel estimation; and application to free-space optical transmission. Following is a summary of the papers.In the paper "Iterative Successive Interference Cancellation for Quasi-Synchronous Block Spread CDMA Based on the Orders of the Times of Arrival", Wang, Bocus, and Coon [1] describe an interference cancellation scheme based on the times of arrival of the signals from different users, and they show that for practical channels this ordering criterion is equivalent to ordering with respect to decreasing average SINR.In "Complexity Reduced MLD Based on QR Decomposition in OFDM MIMO Multiplexing with Frequency Domain Spreading and Code Multiplexing", Nagatomi, Kawai, and Higuchi [2] propose a reduced-complexity maximum likelihood signal detection method for MIMO-OFDM systems with frequency-domain spreading and code multiplexing. They show how to exploit signal orthogonalization based on QR decomposition of the product of the channel and spreading code matrices in the frequency domain to obtain significant complexity reductions.In "Frequency-domain Block Signal detection with QRM-MLD for Training Sequence-aided Single-carrier Transmission", Yamamoto, Takeda and Adachi [3] propose replacement of the cyclic prefix with a known training sequence. The object is to improve BER performance of an equalization scheme which uses QR decomposition with M-algorithm detection, while keeping the number of surviving paths low for reduced complexity. The scheme is especially effective for 16QAM and 64QAM modulation.The paper "Joint Iterative Tx/Rx MMSE-FDE and ISI Cancellation for Single-carrier Hybrid ARQ with Chase Combining" by Takeda and Adachi [4] applies transmitter and receiver equalization and iterative intersymbol interference cancellation to a system with hybrid ARQ transmission, Chase combining and...

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Novel Techniques of Single-CarrierFrequency-Domain Equalization for Optical Wireless Communications

Cited by 40 publications

References 33 publications

Energy Efficiency of Visible Light Communication using SEE-OFDM

Energy Efficiency of Visible Light Communication using SEE-OFDM

Single carrier optical FDM in visible light communication

Advances in single carrier block modulation with frequency domain processing

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