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Formulating the Net Gain of SISO-SFN in the Presence of Erasure Effect
Sungho Jeon,Junghyun Kim,Jae-Shin Han,Jong-Soo Seo [Institute of Electrical and Electronics Engineers 2015 IEEE transactions on broadcasting Vol.61 No.2
<P>In this paper, an analytical formula for the net gain of single-input single-output single frequency network (SISO-SFN) is derived. In order to formulate the net SISO-SFN gain (SISO-SFNG), we derive the average signal to noise ratio, where the SFN gain is calculated by the aggregate power sum as a function of the power imbalance, whereas the SFN loss is calculated by a two-term exponential model from a curve fitting as a function of the erasure probability, modulation order, and code rate. The accuracy and effectiveness of the derived formula are verified by comparing the measurement results with the analytical results. The derived formula helps to rationalize why the net gain is positive or negative under a given condition, e.g., a negative net gain is obtained if the power imbalance exceeds the erasure-free limit. The formula would be very useful to predict more realistic and accurate service coverage of SISO-SFN for various system configurations.</P>
Cooperative space-time block coded full-duplex relaying over frequency-selective channel
Sungho Jeon,Jae-Shin Han,Jeong-Min Choi,Jong-Soo Seo IET 2015 IET COMMUNICATIONS Vol.9 No.7
<P>In this study, the authors investigate a distributed time-reversal space-time block coded (D-TR-STBC) system with amplify-and-forward full duplex relaying (FDR) over frequency-selective channel. In the first, they present an FDR to use in a cooperative D-STBC relaying in which a relay transmits the delayed signal as much as one frame in order to maintain the orthogonal property of STBC at the destination. Then, they briefly present the conventional full self-interference cancellation (SIC) which continuously removes the self-interference signal. As an alternative to the full SIC, they further introduce a partial SIC that periodically performs the SIC process. As a result, it can reduce cancellation processing by a half time compared to the full SIC. In the second, they propose the efficient and yet optimal destination structure consisting of the forward interference cancellation (IC), backward IC and joint equalisation and data combining in order to obtain a full coding gain. It is shown that the proposed D-TR-STBC-FDR system has ~3 dB signal-to-noise ratio gain compared to cooperative half-duplex relaying with D-TR-STBC while it has the same diversity order. In addition, they show that there are no performance losses between FDR with full SIC and FDR with partial SIC.</P>
On the Distribution of MISO Channel Capacity in the Interference-Limited System
JEON, Sungho,HWANG, Soon Up,KYUNG, Ilsoo,SEO, Jong-Soo The Institute of Electronics, Information and Comm 2010 IEICE TRANSACTIONS ON COMMUNICATIONS - Vol.93 No.2
<P>In this paper, the exact distribution of the channel capacity of MISO (multiple-input single-output) systems subject to co-channel interference is derived from an information theoretic viewpoint. It is found that the MISO channel capacity in the interference-limited channel follows the <I>F</I>-distribution. By using these capacity distributions, the outage capacity in Rayleigh fading channels can be accurately computed. We confirm the accuracy of our analysis by performing simulations. Our results exactly match those of the empirical simulations of interference-limited systems.</P>
A Relay-Assisted Handover Technique with Network Coding over Multihop Cellular Networks
Jeon, Sungho,Lee, Sanghoon IEEE 2007 IEEE COMMUNICATIONS LETTERS Vol.11 No.3
<P>A relay-assisted handover technique exploiting network coding for multihop cellular networks is described. In the scheme, each MS (mobile station) in the outer region receives data related to the home cell from the home BS (base station) as well as a coded version of data related to a neighboring BS from a relay node located in the cell boundary via the use of network coding. Thus, MSs can achieve more reliable macro diversity with the assistance of the relay-based handover technique. In a simulation, it is demonstrated that this technique is very effective in maintaining QoS (quality of service) in terms of outage probability over a multi-cell environment</P>
Jeon, Sungho,Choi, Jin-Yong,Yim, Zungkon,Seo, Jong-Soo IEEE 2012 IEEE transactions on broadcasting Vol.58 No.3
<P>This paper provides numerical results for proving the performance gain afforded by signal space diversity (SSD). First, we derive the exact distribution of Bernoulli-<TEX>$\chi^{2}$</TEX> product random variables in order to obtain the average bit error rate (BER). Then, to attain the asymptotic error floor of the average BER, the Chernoff upper bound and the moment generating function of the Bernoulli-<TEX>$\chi^{2}$</TEX> distribution are adopted. As a consequence, we confirm the accuracy of our analysis by simulations, and prove that BER without SSD converges to <TEX>$p/2$</TEX>, whereas when SSD is used, it converges to <TEX>$p^{2}/2$</TEX> regardless of the modulation type and order when the erasure probability is equal to <TEX>$p$</TEX> over both Rayleigh and Rician fading channels.</P>
MIMO Cloud Transmission Based on BICM-ID for High Data Rate Local Contents Delivery
Sungho Jeon,Jae-Shin Han,Shrestha, Robin,Sung Ik Park,Ha-Kyun Mok,Heung Mook Kim,Jong-Soo Seo IEEE 2015 IEEE transactions on broadcasting Vol.61 No.4
<P>A novel cloud transmission (CTxn) technique is proposed based on the multiple-input multiple-output (MIMO), called MIMO CTxn. Even though conventional single-input single-output (SISO) CTxn is operated at a negative signal-to-interference plus noise power ratio (SINR), where interference power is the same as the desired signal power, a critical drawback of SISO CTxn is that the maximum achievable spectral efficiency is less than 1 bit/s/Hz. Applying a MIMO technique to the conventional SISO CTxn provides a very efficient way to support high-date-rate service for delivering local contents, even at a negative SINR. Simulation results show that MIMO CTxn outperforms SISO CTxn while supporting high-order modulation and a high code rate. For instance, 16-QAM code rate 1/3 MIMO CTxn outperforms 4-QAM code rate 1/3 SISO CTxn from the SINR point of view. Further, the performance of MIMO CTxn is invariant with respect to the power imbalance and the difference between the received signal strengths. This makes the coverage planning much easy because all the other regions operate well without any loss of data rate if the coverage is planned with respect to the worst case.</P>
신호공간 다이버시티 기법이 적용된 시스템에서 최대비 합성 수신의 이득 분석
전성호(Jeon Sungho),경일수(Kyung Ilsoo),김만식(Kim Man-Sik) 한국방송·미디어공학회 2009 한국방송공학회 학술발표대회 논문집 Vol.2009 No.11
본 논문에서는 신호 공간 다이버시티 (Signal Space Diversity) 기법이 적용된 시스템에서 최대비 합성 (Maximal Ratio Combining) 수신시 성능 이득에 대해서 분석하였다. 먼저 심볼 오류율(Symbol Error Rate)을 수학적으로 유도하였다. 유도된 공식으로부터 상한(Upper Bound) 분석을 통해 공간 신호 다이버시티 기법이 결합될 경우 기존 대비 2배, 즉 ‘2×수신안테나 수’ 만큼의 다이버시티 이득을 가짐을 증명하였다. 그리고 모의실험 결과와 유도된 공식 결과 값이 서로 일치함을 보여 정확성을 입증하였으며, 유도된 공식을 기반으로 신호 대 잡음비(SNR; Signal-to-Noise Ratio), 수신 안테나 개수 등 주어진 시스템 변수에 따른 최적 회전 각도를 정확히 도출할 수 있음을 보였다.