Conference Presentations by Timo Korhonen
In this paper we consider development of a user friendly medical record to follow-up treatment of... more In this paper we consider development of a user friendly medical record to follow-up treatment of wet AMD (Age-related Macular Degeneration) with VEGF (Vascular Endothelial Growth Factor) inhibitors. A systematic user-centered design process is described that is realized together with ICT-experts and doctors. We will underline especially ways to solve challenges relating to multidisciplinary communication of all parties involved. The developed application tracks macula condition and medical treatments and can display they in a user friendly fashion. Data searches can be done for a dedicated patient or over all patient histories. Modern ICT offers also several ways to process and represent the collected big-data such that significant sickness development trends are easier to recognize and follow. Usability feedback mechanisms for health care personnel are also discussed in the various application development phases that should be used to ensure user application quality and the continuous quality development of the respective care taking practicalities.
Papers by Timo Korhonen
Progress In Electromagnetics Research, 2006
In this paper we use optical power control to support multirate transmission over temporal optica... more In this paper we use optical power control to support multirate transmission over temporal optical CDMA networks. We apply the centralized power control algorithm to set the transmit power of the users' optical sources in order to satisfy a given target QoS. In addition, optical amplifiers are included to enhance the overall system performance while the Amplified Spontaneous Emission (ASE) is considered as the main noise source. The objective function defined as the sum of the transmitted optical power from all nodes is minimized subject to a signal-to-interference (SIR) constraint. Moreover, the network feasibility, defined as the ability to evaluate a power vector that satisfy the target SIR, is discussed in terms of the spectral radius of the network interference matrix. Next, the spectral radius of the network interference matrix is investigated and modeled as a truncated Gaussian distribution. Last, a rate reduction algorithm, categorized in terms of the number of nodes involved in the process of rate reduction, is proposed to increase the network feasibility. As more nodes are added to the rate reduction campaign, the network feasibility is significantly enhanced. For typical network parameters we find by simulating 10 4 random network realizations that a threenode rate reduction results in 99% network feasibility.
Journal of Lightwave Technology, 2006
Iet Intelligent Transport Systems, 2015
The objective of this study is to analyse the interoperability between pan-European eCall and Rus... more The objective of this study is to analyse the interoperability between pan-European eCall and Russian ERA-GLONASS in-vehicle emergency call systems. The analysis is based on a definition of interoperability from International Telecommunication Union and related system standards of eCall and ERA-GLONASS. The authors results indicate that the core functions of both systemsminimum set of data (MSD) transmission at the start of the call and establishing the related voice connection between vehicle occupants and a public safety answering pointwill be available in the interworking scenarios analysed in this study. However, not all features of both systems will be available in use cases with interworking between the systems, such as SMS-based MSD retransmission. The study indicates that further empirical tests are required to obtain more information on practical interoperability between the systems.
In this paper, a predictive closed power control loop for mobile communication systems is simulat... more In this paper, a predictive closed power control loop for mobile communication systems is simulated employing actual multiuser interference. It is shown that when the estimates of the received power level are noisy, and the control loop response is inherently delay-limited, predictive lowpass filtering can be applied to improve the received power level estimates and overall system performance. In this paper, comparative bit error rates and relative transmitter power consumptions between a predictive and a conventional control scheme are presented.
1997 IEEE 47th Vehicular Technology Conference. Technology in Motion, 2000
In this paper, a predictive closed power control loop for mobile communication systems is simulat... more In this paper, a predictive closed power control loop for mobile communication systems is simulated employing actual multiuser interference. It is shown that when the estimates of the received power level are noisy, and the control loop response is inherently delay-limited, predictive lowpass filtering can be applied to improve the received power level estimates and overall system performance. In this paper, comparative bit error rates and relative transmitter power consumptions between a predictive and a conventional control scheme are presented.
Proceedings of ICUPC 97 - 6th International Conference on Universal Personal Communications, 1997
ABSTRACT
Proceedings of 8th International Symposium on Personal, Indoor and Mobile Radio Communications - PIMRC '97, 1997
We have shown previously that Matched Filter Deconvolution (MFD) is a powerful inverse filtering ... more We have shown previously that Matched Filter Deconvolution (MFD) is a powerful inverse filtering technique for increasing time resolution in directsequence (DS) type radio channel sounding [1,2]. A drawback of the technique anyhow is an SNR floor that is caused by deconvolution noise (DN). The DN is correlative with the channel impulse response (LR) and can appear also in noiseless channels. In this paper we suggest that the reason for the DN is in spectral zeros of the soundmg code. The concept is studied
VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151), 1998
Korhonen et al. (1995, 1996) showed that matched filter deconvolution (MFD), a form of minimum va... more Korhonen et al. (1995, 1996) showed that matched filter deconvolution (MFD), a form of minimum variance deconvolution (Chi and Mendel 1984), is a powerful inverse filtering technique for increasing time resolution in direct sequence (DS) radio channel sounding. A drawback of the technique is the impulse response estimate SNR floor due to deconvolution noise (DN). Cancellation of the DN is possible if spectral information at code zero frequencies can be regenerated (Korhonen and Haggman (1997). In this paper we suggest a recursive algorithm where the received spectra at code zeros is regenerated from the thresholded impulse response estimate. The algorithm is denoted as recursive spectral projection (RSP). We present a detailed flowchart, show some guidelines for parameter selection, and demonstrate the algorithm by simulation
1997 IEEE International Conference on Personal Wireless Communications (Cat. No.97TH8338), 1997
This paper presents novel instantaneous radio channel modeling algorithm. It is based on deconvol... more This paper presents novel instantaneous radio channel modeling algorithm. It is based on deconvolution and has four basic modules that are: (1) Determination of' initial estimate by Matched Filter Deconvolutim, (2) Suppression of deconvolution noise, (3) Selection of signal taps and (4) Complex tap mplitude accuracy enhancement. The paper analyzes parameter selection and gives outline of theoretical and simulated performance. As an example we note that the algorithm can achieve with 6 times oversampled 15 chip maximal length code and 5 Rayleigh channel taps average amplitude accuracy enhancement of 8 dB to 19 ctB compared to uncompensated optimum deconvolution when channel SNR is 20 to 40 dB respectively.
Today's mobile phones provide several wireless interfaces, both for local and for cellular connec... more Today's mobile phones provide several wireless interfaces, both for local and for cellular connectivity. What has been lacking, however, is connectivity to the de-facto standard wearable heart beat sensors using a 5 kHz inductive link. We have developed, for mobile phones, a simple add-on device (hardware) that can be plugged to the audio port of a mobile phone, and simple add-on software for Nokia N900 phone, together capable of reading the heart beat signal. Possibilities exist for other use-cases of wireless sensor networks using the presented receiver. inductive link, mobile phones, body area networks I.
Cross layer optimization based on utility functions has been recently studied extensively, meanwh... more Cross layer optimization based on utility functions has been recently studied extensively, meanwhile, numerous types of utility functions have been examined in the corresponding literature. However, a major drawback is that most utility functions take a fixed mathematical form or are based on simple combining, which can not fully exploit available information. In this paper, we formulate a framework of cross layer optimization based on Adaptively Weighted Utility Functions (AWUF) for fairness balancing in OFDMA networks. Under this framework, a two-step allocation algorithm is provided as a sub-optimal solution, whose control parameters can be updated in real-time to accommodate instantaneous QoS constrains. The simulation results show that the proposed algorithm achieves high throughput while balancing the fairness among multiple users.
For data communication over any medium, it is necessary to determine the characteristics of the c... more For data communication over any medium, it is necessary to determine the characteristics of the communication channel. Powerline channel has been considered as a medium not only for low-rate, control communications, but also for high-speed data communications. In order to implement advanced communication technologies, the complete knowledge of the broadband powerline channel, including the analysis of the channel capacity, are required. This paper strives to widen the understanding of broadband indoor powerline channel by focusing on the properties of indoor powerline channels and its noise behavior. Capacity of the PLC-channel is estimated by using a water-pouring algorithm.
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Conference Presentations by Timo Korhonen
Papers by Timo Korhonen