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Analysis of Intersymbol Interference due to Overlap in DM-BPSK
YOON, Taeung,LEE, Youngpo,PARK, So Ryoung,KIM, Suk Chan,SONG, Iickho,YOON, Seokho The Institute of Electronics, Information and Comm 2010 IEICE TRANSACTIONS ON COMMUNICATIONS - Vol.93 No.5
<P>The relationship between the degree of overlap in direct modulation chirp spread spectrum systems with binary phase shift keying and intersymbol interference (ISI) is analyzed. It is observed that the ISI due to overlap fluctuates or monotonically increases as the number of overlaps changes and that, in some cases, the overlap does not incur ISI at all.</P>
A Closed Form BER expression for an Overlap-based CSS System
Taeung Yoon,Seung Hwan Yoo,Sun Yong Kim,Seokho Yoon 대한전자공학회 2008 ITC-CSCC :International Technical Conference on Ci Vol.2008 No.7
Overlap is one of the techniques for increasing bit rate in CSS. More overlaps can offer higher data throughput; however, they may cause more intersymbol interference (ISI) at the same time, resulting in serious bit error rate (BER) performance degradation. This implies that the number of overlaps should be decided according to the required system performance. In this paper, we derive a closed form expression for BER of the overlap-based CSS system, which would be very helpful in setting the number of overlaps. The numerical results demonstrate that the BER derived in a closed form closely agrees with the simulated BER.
Symbol error rate of the dm-mpsk under the influence of jamming signals
Youngpo Lee,Taeung Yoon,Iickho Song,Yun Kim,Tae Han,Seokho Yoon IEEE 2009 IEEE communications letters Vol.13 No.7
<P>Focusing on the performance of the chirp spread spectrum (CSS) communication system under the influence of jamming, we analytically derive the symbol error rate (SER) for the direct modulation CSS system with M-ary phase shift keying in the presence of broadband and tone jamming signals. From numerical results, it is confirmed that the analytic result agrees closely with the empirical SER.</P>
BOC 신호 동기화를 위한 새로운 주변 첨두 제거 기법
김상훈(Sanghun Kim),윤태웅(Taeung Yoon),이영윤(Youngyoon Lee),한태희(Tae Hee Han),윤석호(Seokho Yoon) 한국통신학회 2009 韓國通信學會論文誌 Vol.34 No.1C
Binary offset carrier (BOC) 신호 동기화 과정은 GPS, Galileo와 같은 위성항법시스템에서 가장 중요한 단계이다. BOC 신호 동기화 과정은 일반적으로, 수신 BOC 신호와 단말기의 BOC 신호 사이의 상관함수를 이용하여 이루어진다. 따라서 BOC 자기상관함수의 다중 첨두 문제는 동기화 오차의 주요한 원인이 된다. 최근 Julien에 의해 BOC 상관함수 상의 주변 첨두 크기를 줄일 수 있는 기법이 제안되었다[8]. 그러나 이 기법은 주변 첨두를 완벽히 제거하지 못하며, 적용할 수 있는 신호도 제한적이다. 본 논문에서는 주변 첨두가 완벽히 제거된 새로운 상관함수를 제안하였다. 제안한 상관함수는 sine 위상 및 cosine 위상의 BOC 신호 모두에 적용할 수 있으며, 주변 첨두를 완벽히 제거할 수 있다. 또한 제안한 상관함수를 효율적으로 구현할 수 있는 상관기 구조도 제안하였다. Binary offset carrier (BOC) signal synchronization is one of the most important steps to recover the transmitted information in global navigation satellite systems (GNSS) including Galileo and global positioning system (GPS). Generally, BOC signal synchronization is based on the correlation between the received and locally generated BOC signals. Thus, the multiple side-peaks in BOC autocorrelation are one of the main error sources in synchronizing BOC signals. Recently, a novel correlation function with reduced side-peaks was proposed for BOC signal synchronization by Julien [8]; however, Julien’s correlation function not only still has the side-peaks, but also is only applicable to sine phased BOC(n, n), where n is the ratio of the pseudo random noise (PRN) code rate to 1.023 MHz. In this paper, we propose a new correlation function for BOC signal synchronization, which does not have any side-peaks and is applicable to general types of BOC signals, sine/cosine phased BOC(kn, n), where k is the ratio of a PRN chip duration to the period of a square wave sub-carrier used in BOC modulation. In addition, an efficient correlator structure is presented for generating the proposed correlation function.