Results 251 to 260 of about 1,475,822 (289)
Some of the next articles are maybe not open access.
On Correlation-Based Channel Sensing with IQ Imbalance
2019 15th International Wireless Communications & Mobile Computing Conference (IWCMC), 2019This paper addresses the problem of the detection of the presence of a pre-classified (i.e., pulse shape is known) signals with IQ imbalance considering free-space path-loss. We study the effect of IQ distortion on the probability of detection and false alarm and find the degradation in the probability of detection compared with the case of ideal IQ ...
Ahmed ElSamadouny +4 more
openaire +2 more sources
Channel Imbalance Compensation with IF Signal for China’s IDBSAR
IGARSS 2019 - 2019 IEEE International Geoscience and Remote Sensing Symposium, 2019High-resolution wide-swath (HRWS) synthetic aperture radar (SAR) images are valuable for disaster and environment monitoring. Digital beamforming (DBF) in elevation is a powerful technique for future HRWS SAR. However, real-time DBF processing requires massive digital resources, which are precious for spaceborne SAR.
Qingchao Zhao +8 more
openaire +1 more source
A spectral correction algorithm for I-Q channel imbalance problem
GLOBECOM'01. IEEE Global Telecommunications Conference (Cat. No.01CH37270), 2002A novel spectral correction algorithm for an I-Q channel imbalance problem in a multiuser narrow band system is presented. If the receiver has imperfect I-Q channel oscillators, which are not exactly 90 degree phase shifted and/or are not of the same gains, interference in the image channel used by another user may substantially degrade system ...
Tien-Yow Liu, Stuart Golden, Naiel Askar
openaire +2 more sources
Joint Estimation of Channel and IQ Imbalance in Media-Based Modulation
2019 IEEE 89th Vehicular Technology Conference (VTC2019-Spring), 2019In direct conversion radio frequency (RF) front-end architecture, RF impairments such as IQ imbalance (IQI), DC offset, flicker noise, and oscillator leakage can affect the performance. In this work, we study the performance of media-based modulation (MBM), an attractive channel modulation scheme, in the presence of transmit and receiver side IQI and ...
Bharath Shamasundar, A. Chockalingam
openaire +2 more sources
Effects of Received Power Imbalance on the Channel Capacity of a Handset MIMO
2007 IEEE 18th International Symposium on Personal, Indoor and Mobile Radio Communications, 2007This paper presents a basic investigation of the power imbalance problem using a dipole array and a handset MIMO model in a browsing situation. Using channel modeling that includes the effects of 3-dimensional angular spectrum and polarization of incident waves, we carried out a Monte Carlo simulation. From the results obtained in this study, estimates
Koichi Ogawa +3 more
openaire +2 more sources
The Effects of Noise Correlation and Power Imbalance on Terrestrial and Satellite DPSK Channels
IEEE Transactions on Communications, 1983New results are given for the bit error probability for binary DPSK modulation over both terrestrial and satellite channels taking into account noise correlation and power imbalance. The new expressions are remarkably simpler than their previously published counterparts.
Robert F. Pawula, J. H. Roberts
openaire +2 more sources
Performance Analysis of OFDM Channel Estimation Under IQ Imbalance [PDF]
, 2021 This study was done in attempt to investigate the effect of In-Phaseand- Quadrature Imbalance (IQI) presence in Orthogonal Frequency Division Multiplexing system (OFDM).
Ngu War Hlaing +4 more
openaire +2 more sources
Joint Estimation of Channel and I/Q Imbalance in OFDM/OQAM Systems
IEEE Communications Letters, 2016In this letter, we propose a preamble-based joint estimation of channel and I/Q imbalance in orthogonal frequency division multiplexing (OFDM) with offset quadrature amplitude modulation (OQAM) systems. To estimate the mixed effect of channel and I/Q imbalance in frequency domain, a preamble utilizing the staggered structure of OFDM/OQAM signal is ...
Manabu Sakai +2 more
openaire +1 more source
Adaptive IQ imbalance compensation scheme with frequency offset for communication channel
CCNC 2006. 2006 3rd IEEE Consumer Communications and Networking Conference, 2006., 2006IQ signal processing is widely utilized in today's communication receivers. However, it usually faces a common problem of mismatch of the amplitudes and phases on I and Q branches because of the gain and phase imbalance between quadrature mixers. In this paper, we propose a novel method to estimate and compensate for the IQ imbalances for communication
Szu-Lin Su, Yi-Jen Chiu
openaire +2 more sources
A novel IQ imbalance and channel estimation algorithm for Alamouti OFDM systems
2013 IEEE International Conference on Communications (ICC), 2013This paper shows that the unwanted In-phase/quadrature (IQ) imbalance can be exploited to achieve a diversity gain for Alamouti space-time coding orthogonal frequency division multiplexing (AL-OFDM) systems. In addition, we propose a novel iterative algorithm to jointly estimate the channel impulse response (CIR) and IQ imbalance occurring at both the ...
Mohamed Marey +4 more
openaire +1 more source