Channel reciprocity and time-reversed propagation for ultra-wideband communications

Qiu, Robert C.; Zhou, Chunting; Zhang, J.Q.; Guo, Nan

doi:10.1109/aps.2007.4395422

Cited by 35 publications

(13 citation statements)

References 9 publications

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“…It is also possible to consider the reciprocity of the channels, where transmitters and receiver can have their positions reversed with the channel transfer function remaining the same, as confirmed by Dong et al [15] and Qiu et al [40]. Hence, there is the opportunity to examine the potential benefits of employing receive diversity (assuming three receivers on body and the transmitting base station) and also investigate the effects of having antennas close together in a rectangular body-centric package.…”

Section: Channel Cross-correlation and Antenna Spatial Diversitymentioning

confidence: 60%

Body‐centric ultra‐wideband multi‐channel characterisation and spatial diversity in the indoor environment

Catherwood

Scanlon

2013

IET Microwaves, Antennas & Propagation

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This study presents the findings of an empirical channel characterisation for an ultra-wideband off-body optic fibre-fed multiple-antenna array within an office and corridor environment. The results show that for received power experiments, the office and corridor were best modelled by lognormal and Rician distributions, respectively [for both line of sight (LOS) and non-LOS (NLOS) scenarios]. In the office, LOS measurements for t mean and t RMS were both described by the Normal distribution for all channels, whereas NLOS measurements for t mean and t RMS were Nakagami and Weibull distributed, respectively. For the corridor measurements, LOS for t mean and t RMS were either Nakagami or normally distributed for all channels, with NLOS measurements for t mean and t RMS being Nakagami and normally distributed, respectively. This work also shows that achievable diversity gain was influenced by both mutual coupling and cross-correlation co-efficients. Although the best diversity gains were 1.8 dB for three-channel selective diversity combining, the authors present recommendations for improving these results.

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Section: Channel Cross-correlation and Antenna Spatial Diversitymentioning

confidence: 60%

Body‐centric ultra‐wideband multi‐channel characterisation and spatial diversity in the indoor environment

Catherwood

Scanlon

2013

IET Microwaves, Antennas & Propagation

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“…Special case: In the special case in which k b,1 = k b,2 = · · · = k b,Nt = k b , b 1 = b 2 = · · · = b Nt = b and the random variable X , defined in Appendix B (25), follows chi-square distribution, which CDF given by…”

Section: B Outage Probabilitymentioning

confidence: 99%

Analytical Performance Evaluation of Beamforming Under Transceivers Hardware Imperfections

Boulogeorgos

Alexiou

2019

2019 IEEE Wireless Communications and Networking Conference (WCNC)

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In this paper, we provide the mathematical framework to evaluate and quantify the performance of wireless systems, which employ beamforming, in the presence of hardware imperfections at both the basestation and the user equipment. In more detail, by taking a macroscopic view of the joint impact of hardware imperfections, we introduce a general model that accounts for transceiver impairments in beamforming transmissions. In order to evaluate their impact, we present novel closed form expressions for the outage probability and upper bounds for the characterization of the system's capacity. Our analysis reveals that the level of imperfection can significantly constraint the ergodic capacity. Therefore, it is important to take them into account when evaluating and designing beamforming systems.

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“…In this case, both the sounding waveform and the data-encoded pre-compensation waveform (to be discussed in Section IV) are transmitted from Tx to Rx. Alternatively, by exploiting the reciprocity property of UWB [23], one might choose to perform the channel characterization in a reversed way -directly transmitting the sounding waveform from the original receiver (Rx) to the original transmitter (Tx) over the UWB channel, after which the original Tx performs the channel impulse response analysis and generates the pre-compensation waveform. In this case, the sounding waveform and the data-encoded pre-compensation waveform travel in opposite directions -from Rx to Tx for the former, and from Tx to Rx for the latter.…”

Section: Channel Soundingmentioning

confidence: 99%

Photonic-Assisted Error-Free Wireless Communication With Multipath Precompensation Covering 2–18 GHz

Weiner

2016

J. Lightwave Technol.

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Abstract-A wireless communication experiment that uses photonic-assisted radio-frequency arbitrary waveform generation (RF-AWG) for precompensation of multipath distortion over a 2-18 GHz frequency band is reported. Photonic-assisted RF-AWG is used both for spread spectrum sounding of the multipath channel and for synthesis of precompensation waveforms that yield pulse compression and distortion suppression at the receiver. By directly encoding the precompensated waveforms in optical hardware, 250 Mbit/s error-free data transmission is achieved experimentally in binary-phase-shift-keying format. For the first time to our knowledge, phase compensation and time reversal precompensation techniques are compared in hardware encoded data transmission experiments; our results confirm predictions that phase compensation outperforms time reversal under intersymbol interference limited conditions. Index Terms-Microwave communications, multipath channel, optical pulse shaping.

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Channel reciprocity and time-reversed propagation for ultra-wideband communications

Abstract: This paper is the first paper of an new effort to understand UWB communications and sensor networking in RF harsh environments. Channel reciprocity and time reversed propagation are studied, using an intra-vehicle environment. Communications using time reversal is also investigated.

Cited by 35 publications

References 9 publications

Body‐centric ultra‐wideband multi‐channel characterisation and spatial diversity in the indoor environment

Body‐centric ultra‐wideband multi‐channel characterisation and spatial diversity in the indoor environment

Analytical Performance Evaluation of Beamforming Under Transceivers Hardware Imperfections

Photonic-Assisted Error-Free Wireless Communication With Multipath Precompensation Covering 2–18 GHz

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