Subcarrier pairing for self-heterodyne OFDM

Fernando, Nirmal; Hong, Yi; Viterbo, Emanuele

doi:10.1109/icc.2013.6655019

Cited by 10 publications

(9 citation statements)

References 11 publications

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“…In [12], we present a subcarrier pairing scheme to improve the overall bit error rate (BER) performance of self-het OFDM communications. As shown in (8), the equivalent noise power of the k-th carrier σ 2 Z k depends on the subcarrier index k, where σ 2 Z k decreases with k. Hence, unbalanced SINRs occurs in self-het OFDM subcarriers.…”

Section: B Ofdm Subcarrier Pairingmentioning

confidence: 99%

“…Subcarrier pairing scheme [12]: In self-het OFDM, unbalance signal-to-interference noise ratios (SINRs) occur over all subcarriers. The subcarrier pairing is performed across those OFDM subcarriers by grouping good OFDM subcarriers with high SINRs and bad OFDM subcarriers with low SINRs, in order to improve the overall system performance [12].…”

Section: Introductionmentioning

confidence: 99%

“…The subcarrier pairing is performed across those OFDM subcarriers by grouping good OFDM subcarriers with high SINRs and bad OFDM subcarriers with low SINRs, in order to improve the overall system performance [12].…”

Section: Introductionmentioning

confidence: 99%

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Analysis of Self-Het OFDM enhancements for 60GHz indoor RF channels

Fernando

Hong

Viterbo

2013

2013 Australian Communications Theory Workshop (AusCTW)

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In this paper, we consider two enhancements for self-heterodyne OFDM (Self-Het OFDM): subcarrier pairing and smart carrier positioning (SCP). We analyze their performance over a practical 60 GHz indoor RF channel. This channel deviates from the standard AWGN and Rayleigh fading models for Line of Sight (LoS) and Non LoS. We show that for NLoS channels they can jointly improve the diversity order and performance by 7.7 dB at BER of 10 −2 , when compared to the standard self-het OFDM. Similar improvements are observed for channels with strong LoS components.

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Section: B Ofdm Subcarrier Pairingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Analysis of Self-Het OFDM enhancements for 60GHz indoor RF channels

Fernando

Hong

Viterbo

2013

2013 Australian Communications Theory Workshop (AusCTW)

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“…However, the self-heterodyne transmission scheme holds several disadvantages. The bandwidth efficiency and the power efficiency are only 50 %, since optimum performance is obtained with equal power distribution between the carrier and the OFDM subcarriers (Fernando et al, 2013b). This results in a difference in performance of about 5 dB between quadrature amplitude modulated (QAM) self-heterodyne-OFDM and super-heterodyne QAM-OFDM, when the bit error ratio (BER) is considered over the signal to noise ratio (SNR) (Pacheco and Hatzinakos, 2004).…”

Section: Introductionmentioning

confidence: 99%

Orthogonal frequency division multiplexing with amplitude shift keying subcarrier modulation as a reliable and efficient transmission scheme for self-mixing receivers

2017

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Abstract. A new receiving scheme for self-mixing receivers is presented that overcomes the disadvantages of the selfheterodyne concept. Generally speaking, the self-mixing receiver offers immunity to phase noise and frequency offsets, especially at very high frequencies, since it does not require radio frequency local oscillators. Our proposed technique eliminates the drawbacks of the self-heterodyne transmission scheme, which are the poor power efficiency and the strong dependence on the continously transmitted carrier.A nonlinear system of equations is constructed that describes a phase retrieval problem for the reconstruction of the original transmit signal before self-mixing. Two different solution strategies, with restrictions in time and frequency domain, are presented. As a consequence, the self-mixing equation system is shown to be solvable with some a-priori information about the transmit signal. With this novel approach, the transmitted information is distributed over the full available bandwidth, and there is no special dependence on a certain subcarrier for the down-conversion.The general performance, regarding bit error ratio over signal to noise ratio, is improved by at least 2 dB as compared to the self-heterodyne transmission scheme. In the case of frequency selective channels, e.g. multi-path propagation, this improvement is shown to be much larger, because the presented approach is able to reconstruct the received subcarriers without the necessity of receiving all subcarriers.

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“…al. proposed self-heterodyne OFDM (self-het OFDM) in [6], [7] as an alternative OFDM technique to compensate these high-level oscillator instabilities in 60 GHz RF bands. In self-het OFDM, the transmitter sends both the local RF carrier and the OFDM subcarriers, and a square-law circuitry (self-mixing) is used at the receiver to down-convert the RF signal.…”

Section: Conventionalmentioning

confidence: 99%

MIMO Self-Heterodyne OFDM using SCP with Noise

Prasanthi¹,

Krishna²

2017

IJCA

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Heterodyning, also known as frequency conversion, used widely in communication engineering to generate new frequencies and move information from one frequency channel to another. In this paper, we are proposing a multipleinput multiple-output (MIMO) self-het OFDM with the adaptive smart carrier position (SCP) technique. At the transmitter, a space-time block code (STBC) is used to produce the coded information symbols to be transmitted on each antenna over the self-het OFDM subcarriers. At the receiver, a simple non-linear detection is adopted at each receiver communication side. The achievable diversity order of such setting is analyzed, and it is found that with the adaptation of SCP technique, the diversity loss in comparison to the conventional coherent MIMO-OFDM can be compensated. Our approach helps in minimising the error floor, phase noise and fading occuring at the reciever.

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Subcarrier pairing for self-heterodyne OFDM

Cited by 10 publications

References 11 publications

Analysis of Self-Het OFDM enhancements for 60GHz indoor RF channels

Analysis of Self-Het OFDM enhancements for 60GHz indoor RF channels

Orthogonal frequency division multiplexing with amplitude shift keying subcarrier modulation as a reliable and efficient transmission scheme for self-mixing receivers

MIMO Self-Heterodyne OFDM using SCP with Noise

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