• Title/Summary/Keyword: CCSK

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Synchronization Scheme for CCSK based LPD Systems (CCSK 변조방식을 사용하는 LPD 시스템을 위한 동기 기법)

  • Kang, Donghoon;Kim, Haeun;Oh, Wangrok
    • Journal of the Institute of Electronics and Information Engineers
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    • v.52 no.7
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    • pp.3-9
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    • 2015
  • In this paper, we propose an initial timing and frequency synchronization scheme for low probability detection (LPD) systems with cyclic code shift keying (CCSK). The performance of the LPD system with CCSK highly depend on initial timing and frequency offset. On the other hand, the operating SNR (Signal-to-Noise Ratio) of LPD systems is usually very low. Hence, to guarantee a reliable performance of the LPD system, it is crucial to develop suitable initial synchronization algorithms. In this paper, we propose an initial timing and frequency synchronization scheme suitable for CCSK based LPD system using a repeated preamble pattern.

Study on Performance Enhancement for a Cyclic Code Shift Keying Frequency Hopping Spread Spectrum/Time Division Multiple Access System (순환천이변조 주파수도약대역확산/시분할다중접속 시스템의 성능 개선에 관한 연구)

  • Kim, Eun-Cheol;Kim, Seung-Chun;Lee, Hyung-Keun
    • Journal of IKEEE
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    • v.16 no.1
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    • pp.51-55
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    • 2012
  • In this paper, we propose to employ a ternary sequence as a cyclic code shift keying (CCSK) modulation sequence. And we simulate the performance in a frequency hopping spread spectrum/time division multiple access (FHSS/TDMA) system with CCSK. Wireless channel is modeled as Rayleigh fading channel. From the simulation results, it is demonstrated that the system adopting the ternary sequence as a CCSK sequence has higher performance than that with a random sequence.

Performance Evaluation of Non-Coherent Detection Based Cyclic Code-Shift Keying (비동기 검파 기반 순환 부호 편이 변조 방식의 성능 분석)

  • Baek, Seung-Min;Park, Su-Won;Chung, Young-Uk
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.47 no.6
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    • pp.42-48
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    • 2010
  • Joint Tactical Information Distribution System (JTIDS) uses cyclic code shift keying (CCSK) for baseband symbol modulation, in which 5-bit information is mapped to one of thirty two 32-chip sequences. It is a kind of direct sequence based spread spectrum communication. In this paper, the performance of non-coherent detection of CCSK using non-orthogonal 32-chip sequence is evaluated. And a 32-chip sequence with better performance is also proposed and compared with the conventional one.

Clear Cell Sarcoma of the Kidney - a Case Report - (신장의 투명세포 육종 1예)

  • Park, Jae-Hyun;Jung, Jae-Hee;Lee, Ah-Won;Song, Young-Tack
    • Advances in pediatric surgery
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    • v.7 no.2
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    • pp.162-165
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    • 2001
  • Clear Cell Sarcoma of the Kidney(CCSK) is a rare malignant childhood tumor with frequent metastasis to the bone. We report a case of right sided in a 5 month-old girl. A radical nephrectomy was performed. It was clinical stage III with renal capsular invasion and lymph node metastasis by the classification of NWTS-5. Histologic examination revealed the classic pattern of CCSK. Postoperative adjuvant chemotherapy with doxorubicin and radiotheraphy were applied.

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Metastatic Clear Cell Sarcoma of the Kidney in a Child's Hand Bone - A Case Report - (소아의 수부골에 전이된 신장의 투명세포육종 -1례 보고-)

  • Shim, Jong-Sup;Kim, Jee-Hyoung;Suh, Yeon-Lim
    • The Journal of the Korean bone and joint tumor society
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    • v.4 no.2
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    • pp.94-98
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    • 1998
  • Clear cell sarcoma of the kidney (CCSK) is a rare malignant tumor of the renal origin in childhood, distinguished from Wilms tumor by its pathologic and clinical features. Bone metastasis is one of the characteristic clinical features. The common site of metastasis of the clear cell Sarcoma of the kidney is axial skeleton including skull, spines, ribs and femur. A cases of clear cell Sarcoma of the kidney presented to us, which solely metastasized to the hand bones without metastasizing to any other tissues including axial skeleton. We report this case with review of literatures.

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Satellite Data Link Waveform and Transponder Structure for Anti-Jamming (항재밍을 위한 위성데이터링크 웨이브폼 및 중계기 구조)

  • Kim, Ki-Keun;Lee, Min-Woo;Lim, Jae-Sung
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.36 no.12B
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    • pp.1728-1735
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    • 2011
  • In this paper, satellite data link waveform is proposed which is based on the waveform of Link-16 but LDPC code is studied instead of CCSK code in order to be optimized to satellite nonlinear channel environment and transmission characteristics. And the DSM (Demux, Selective CH switch, and Mux) transponder structure is suggested which can remove all of the jamming signal out of the transmission signal band and convert uplink hopping frequency to desired ones of downlink. The results of BER and anti-jamming performance analysis shows that the required Eb/No and processing gain in the worst case partial band jammer of the proposed waveform are 2.5dB and 52dB respectively and the anti-jamming capacity improvement of DSM transponder is maximum 2dB.