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정근열,곽진규,양정모,강찬석,강경식,박진수 청주대학교 산업과학연구소 1995 産業科學硏究 Vol.13 No.-
In this paper, the performances of FH/CPFSK system we have been analyzed for thermal noise, partial-band jamming noise and adjacent interference of all eight bit pattern. The parameters to analize performances of FH/CPFSK system have been used the bit rate, modulation index and performances of FH/CPFSK system with the differential detector and with limiter-discriminator have been presented with optimum correlation function And, we were compared with performance of FH/CPFSK and FH/BFSK system In result, we could know that bit error probability of the approximation equation and exact equation nearly accorded in the high signal-to-noise ratio And, we have been proved that FH/CPFSK system with differential detection according to jamming fraction γ was worst to 3㏈ than FH/CPFSK system with limiter-discriminator, but was superior to 2㏈ than FH/BFSK
홍성원,정근열,백승재,박진수 청주대학교 산업과학연구소 2000 産業科學硏究 Vol.17 No.2
In this paper, because of excellent decoding efficiency, the performance of turbo code is actively studied at present time. So for analysis the performance of turbo code we found out polynomial, interleaver size and interleaver kinds, iterative number and each BER(Bit Error Rate) given by signal versus noise rate(E_(b)/N_(0)) on condition that transmission rate is 1/2 and under AWGN channel with BPSK system. The result is that the performance of turbo code depends on constraint length size, iterative number and interleaver size and interleaver kind. The more constraint length, iterative number and interleaver size increase, the more performance of turbo code increase. In the case of interleaver type the performance of turbo code increase when using random interleaver. Also we found out that although the performance increase due to iterative number increment, if iterative is or more six, the improvement of the performance is so small.
이상적인 자기 상관 특성을 갖는 이진 시퀀스의 Trace 함수 표현에 기초한 부울 함수 표현
원장식,정근열,박진수 청주대학교 산업과학연구소 1998 産業科學硏究 Vol.16 No.-
Pseudorandom sequences of period N(=2^(m)-1) with ideal autocorrelation apply to spread spectrum communication systems, radar systems and CDMA systems and some of well-known examples are m-sequences. These sequences(m-sequences, GMW sequences, Legendre sequences, Hall's sextic residue sequences, and so forth) are best described in terms of trace functions Generally, binary sequences of period N(=2^(m)-1) are expressed as Trace function on the GF(2^(m), but Trace function representation is so difficult that we can't find properties of sequences. By the way, binary sequences of period N(=2^(m)-1) can be expressed as the combination of m-variable Boolean function, f(x_(l) ,x_(2), ,x_(m)) In this case, properties of sequences can be found easily. So I implemented the Boolean function representation for above mentioned the family of sequences with relation that the property of Trace function. So far, the study to find binary pseudonoise sequences with ideal autocorrelation property is being done so we need the procedure to transform sequences into Boolean function.
부분대역 재밍하에서 자동검파를 이용한 FH/CPFSK 시스템의 성능분석
安重守,鄭根烈 충주대 산업과학기술연구소 1995 産業科學論文集 Vol.3 No.-
In this paper, the performances of FH/CPFSK system have been analyzed for thermal noise, partial-band jamming noise and adjacent interference of all eight bit pattern. The parameters to anlalize performances of FH/CPFSK system have been used the bit rate, modulation index and performances of FH/CPFSK system with the differential detector and with limiter-discriminator have been presented with optimum correlation function. In result, we can find that bit error probability of the approximation equation and the exact equation is nearly accorded in the high signal-to-noise ratio. And, ibis proved that FH/CPFSK system with differential detection according to jamming fraction γ was worst to 3dB than FH/CPFSK system with limiter-discriminator.
무선 멀티미디어에 적용을 위한 다양한 대기시간을 가지는 터보코드
홍성원,정근열,박진수 청주대학교 산업과학연구소 1998 産業科學硏究 Vol.16 No.-
Multimedia communication systems requite different Qualities of Service (QoS ) for different types of information. the QoS is generally expressed in terms of a maximum acceptable latency and Bit Error Rate(BER) or Frame Error Rate(FER). In turbo coded systems a tradeoff can be exploited in multimedia communication systems by using different interleaver sizes to achieve different QoS's. In this paper the tradeoff between latency and BER is further explored through simulation. The results are used to propose an adaptive turbo coding strategy for wireless multimedia communication that incorporate a set of interleaves of variable sizes that achieve an appropriate set of QoS's.
部分帶域 재밍하에서 FH/CPFSK 시스템의 性能 分析
安重守,鄭根烈 충주대학교 산업과학기술연구소 2002 産業科學論文集 Vol.10 No.-
In this paper, we analyzed the performance of FH/CPFSK system with differential detection in thermal noise, partial-band jamming noise and adjacent interference of bit pattern. The parameters to analize performances of FH/CPFSK system have been used the bit rate, modulation index and performances of FH/CPFSk system with the differential detector have been presented with the optimum correlation function. And, we were compared with performance of FH/CPFSK and FH/BFSK system. In result, we could know that bit error probability of the approximation equation and exact equation nearly accorded in the high signal-to-noise ratio. And, we have been proved that FH/CPFSK system with differential detection according to jamming fraction γ was worst to 3dB than FH/CPFSK system with limiter-discriminator, but was superior to 2dB than FH/BFSK.