Yaning Zou

Yaning Zou
Tampere University | UTA · Department of Communications Engineering

Doctor of Engineering

About

48
Publications
10,266
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623
Citations

Publications

Publications (48)
Article
Full-text available
The effects of oscillator phase noises (PNs) on multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) systems are studied. It is shown that PNs of common oscillators at the transmitter and at the receiver have the same influence on the performance of (single-stream) beamforming MIMO-OFDM systems, yet different infl...
Article
Full-text available
In this paper, we propose an analog beamsteering approach for enabling flexible hybrid beamforming design that can achieve performance close to singular value decomposition (SVD) based digital beamforming with single user case. As a starting point, assuming the use of a codebook with infinite precision, we apply transposes of antenna array response...
Article
Full-text available
In this paper, we study the joint impact of three major RF im-pairments, namely, oscillator phase noise, power amplifier non-linearity and I/Q imbalance on the performance of a mm-wave communication link based on OFDM modulation. General im-pairment models are first derived for describing the joint effects in each TX, each RX as well as a mm-wave c...
Article
Full-text available
In this paper, we propose a sequential hybrid beamforming design for multi-link transmission over mmwave frequency bands. As a starting point, a baseline data communication link is established via traditional analog beamforming at both the BS and UE. If an extra RF chain is available at the UE, it can continue to probe the propagation environment a...
Conference Paper
Full-text available
In this paper, we study the joint impact of three major RF impairments, namely, oscillator phase noise, power amplifier nonlinearity and I/Q imbalance on the performance of a mm-wave communication link based on OFDM modulation. General impairment models are first derived for describing the joint effects in each TX, each RX as well as a mm-wave comm...
Article
Full-text available
This paper analyzes the performance of linearly precoded time division duplex based multi-user massive MIMO downlink system under joint impacts of channel non-reciprocity (NRC) and imperfect channel state information (CSI). We consider a practical NRC model which accounts for transceiver frequency-response mismatches at both user equipment (UE) and...
Article
Full-text available
Single-carrier frequency-division multiple access (SC-FDMA), which is a modified form of orthogonal frequency division multiple access (OFDMA), has been adopted as the uplink physical-layer radio access technique for the Third Generation Partnership Project Long-Term Evolution (3GPP-LTE) and LTE-Advanced. Radio transceiver implementations for such...
Conference Paper
Full-text available
In this paper, we analyze the impact of channel non-reciprocity due to two implementation imperfections, namely, transceiver frequency-response and antenna mutual coupling mismatches at the base-station side in multi-user massive MIMO system context. Signal models are first developed to characterize the joint effects of these two imperfections in p...
Conference Paper
Full-text available
In this paper, we propose an efficient transceiver non-reciprocity estimation-compensation framework for precoded TDD multi-user MIMO-OFDM downlink transmission systems. General signal models are first developed to analyze the effects of transceiver non-reciprocity at both the base-station and user equipment sides. The analysis shows that transceiv...
Conference Paper
Full-text available
This paper studies the impact of two implementa-tion imperfections, namely, transceiver frequency-response non-reciprocity and antenna mutual coupling mismatches at the base-station and user equipment on the channel reciprocity assumption in TDD systems. Comprehensive signal models are first developed to analyze the joint effects of these two imper...
Article
For the development of highly integrated, flexible and low-cost cognitive radio (CR) devices, simple transceiver architectures, like direct-conversion receiver, are expected to be deployed and provide viable radio frequency (RF) spectrum sensing solutions for practical implementation. Yet, this can be very challenging task especially if spectrum se...
Article
In this paper, we analyze the sensitivity of orthogonal frequency-division multiplexing waveforms to the joint distortion effects of coexisting nonidealities in the implementation of transceiver radio frequency (RF) electronics, combined also with time variations of the multipath radio channel. To cope with the challenge in evaluation of error rate...
Article
Full-text available
Ambient Media describe media environments, where the medium is embedded within the natural environment. They follow the anytime, anywhere, and anyhow principle for media access. The Nokia Ubimedia MindTreks Awards have been established a few years ago to explore the potential of ambient media. In this article we analyze the total project portfolio...
Article
Full-text available
“Design Thinking” – a cross-disciplinary and user centered method – is an approach towards the discovery of solutions and sparks innovative thinking in many ways. It also can be argued, that designers put themselves in the place of the user rather than co-creating with the consumer. Innovation is one of the current keywords across many industries,...
Article
OFDM and other multicarrier waveforms are in general very sensitive to RF non-idealities, such as phase noise and IQ imbalance, of transmitting and receiving devices. Extensive work has been carried out in the open literature in analyzing the performance of OFDM radio link under such RF impairments in terms of detection error rate and mostly concen...
Article
This article proposes a framework for the optimization of voltage-controlled oscillator (VCO) designs in frequency synthesizers for digital video broadcasting – terrestrial/handheld (DVB-T/H) receivers. Linear time-invariant phase-domain model of a charge-pump phase-locked loop (PLL) is devised and includes both flicker (1/f) and thermal noise cont...
Article
Full-text available
Direct-conversion architecture-based orthogonal frequency division multiplexing (OFDM) systems are troubled by impairments such as in-phase and quadrature-phase (I/Q) imbalance and carrier frequency offset (CFO). These impairments are unavoidable in any practical implementation and severely degrade the obtainable link performance. In this contribut...
Conference Paper
Full-text available
I/Q signal processing based communication systems suffer from analog front-end (FE) imperfections such as in-phase and quadrature-phase (I/Q) imbalance and carrier frequency offset (CFO). These impairments are commonly encountered in all practical implementations, and severely degrade the obtainable link performance. Moreover, orthogonal frequency...
Conference Paper
Full-text available
In this paper, we study the impact of an important RF impairment inside direct-conversion receiver, namely the I/Q imbalance, on the performance of OFDM radio link over frequency-selective Rayleigh fading channel. Closed-form expressions for link performance, in terms of detection error rate, ergodic capacity and outage capacity, under both frequen...
Conference Paper
Full-text available
This article addresses the signal distortion caused by receiver phase noise (PN) on OFDM waveforms in direct-conversion radio receivers. A closed-form solution for the observed signal-to-interference-plus-noise ratio (SINR) is derived, describing the level of intercarrier interference (ICI) stemming from PN. Compared to existing literature, the ana...
Article
The implementation challenges in building compact and low-cost radios for future wireless systems are continuously growing. This is partially due to the introduction of multi-antenna transmission techniques as well as the use of wideband communication waveforms and high-order symbol alphabets, in addition to the increasing demands for more efficien...
Conference Paper
Full-text available
In the last few years cellular market well exceeded 1.3B cellular mobile devices shipped per year. The ongoing economic-driven shrink in technology towards nanoscale CMOS enables increased functionality in even smaller silicon area, however, technology effects including process variation, variability, temperature effects, flicker noise etc. put str...
Conference Paper
A linear time-invariant phase-domain phase-locked loop (PLL) model including the effects of thermal and flicker (1/f) noise sources is devised. Phase noise from the frequency dividers, loop oscillators, and oscillator buffering is modeled. Flicker noise is shown to be of major significance for the accurate characterization of DVB-T/H terminals inte...
Article
One of the key trends in the design of radio receivers and other wireless devices is to shift more and more of the transceiver functionalities to digital signal processing (DSP). At the same time, the demands on the remaining analog circuits are greatly increased, especially with lower power supplies and nanoscale technology effects such as variabi...
Conference Paper
Full-text available
This paper studies the impact of one important radio transceiver impairment, namely the I/Q imbalance, on the link performance of spatial multiplexing MIMO-OFDM systems. A closed-form solution for the effective signal-to-interference-plus-noise-ratio (SINR) at the input of the receiver detection stage due to frequency-selective transmitter and rece...
Conference Paper
Full-text available
This paper presents a pilot-based compensation algorithm for mitigation of frequency-selective I/Q imbalances in direct-conversion OFDM transmitters. By deploying a feedback loop from RF to baseband, together with a properly-designed pilot signal structure, the I/Q imbalance properties of the transmitter are efficiently estimated in a subcarrier-wi...
Article
Space-time coded wireless transmission techniques with multiple transmit and receive antennas can provide considerable increases in both the link quality as well as link capacity when compared to ordinary single-antenna techniques. However, multiantenna transmission basically calls for multiple parallel radio implementations, and the resulting link...
Conference Paper
Full-text available
The implementation challenges in building compact and low-cost radios for future wireless systems are continuously growing. This is partially due to the introduction of multiantenna transmission techniques, calling for several parallel radio implementations in a single terminal, with considerably reduced implementation resources (size and cost) for...
Conference Paper
Full-text available
In multi-antenna transmission systems, multiple parallel radio implementations are needed. To keep the overall transceiver implementation feasible, this poses big restrictions on the size and cost of individual radios, resulting in various imperfections in the analog radio front-ends. One good example is the so-called I/Q imbalance problem related...
Article
Full-text available
The combination of orthogonal frequency division multiplexing (OFDM) and multiple-input multiple-output (MIMO) techniques has been widely considered as the most promising approach for building future wireless transmission systems. The use of multiple antennas poses then big restrictions on the size and cost of individual radio transmitters and rece...
Conference Paper
Full-text available
The combination of orthogonal frequency division multiplexing (OFDM) and multiple-input multiple-output (MIMO) techniques has been widely considered as the most promising approach for building future wireless transmission systems. In such systems, the limited implementation resources for the radio parts cause big restrictions on the size, cost, and...
Conference Paper
Through the introduction of multiple antennas in future wireless communications systems, the requirements for the power consumption, cost and size of individual radio front-ends become even more challenging than in the current single antenna systems. In this context, the so called direct-conversion front-end architecture is of big interest for buil...

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