• Title/Summary/Keyword: WCDMA

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Experimental Interference Studies Between WCDMA and UWB System

  • Kim, Myung-Jong;Kim, Jae-Young;Kang, Young-Jin;Hong, Ic-Pyo
    • Proceedings of the Korea Society of Information Technology Applications Conference
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    • pp.187-190
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    • 2005
  • Ultra wideband (UWB) technologies have been developed to exploit a new spectrum resource in substances and to realize ultra-high-speed communication, high precision geolocation, and other applications. The energy of UWB signal is extremely spread from near DC to a few GHz. This means that the interference between conventional narrowband systems and UWB systems is inevitable. However, the interference effects had not previously been studied from UWB wireless systems to conventional mobile wireless systems sharing the frequency bands such as WCDMA system. This paper experimentally evaluates the interference from two kinds of UWB sources, namely a direct-sequence spread-spectrum UWB source and an impulse radio UWB source, to a WCDMA digital transmission system. The average frame error rate degradations are presented. From these experimental results, we show that in all practical cases UWB system can coexist with WCDMA terminal without causing any dangerous interference.

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Development of a Wireless Engineering Tool for IMT-2000 System Based on WCDMA (WCDMA를 기반으로 한 IMT-2000시스템의 무선망 엔지니어링 툴의 개발)

  • 정회영;이인웅;조병헌;임재봉;오하령;성영락
    • Proceedings of the IEEK Conference
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    • pp.201-204
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    • 2000
  • In this paper, a wireless engineering field tool based on WCDMA is designed and implemented. Emerging requirements for higher rate data service and better spectrum efficiency are identified for the third generation mobile radio systems. The proposed WCDMA field tool is used for improving the quality of WCDMA service. The current position and time are measured and recorded with CDMA field data. With the system a user can observe the spatial distribution of the field data. For providing concurrency, the system is decomposed of four units and each unit is implemented by using threads.

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A Comparison of SCTP with TCP-MH on WCDMA-WLAN Interworking Scenario (WCDMA-WLAN 연동간의 SCTP와 TCP-MH 특성 비교)

  • Song, Se-Hwa;Han, Chan-Kyu;Choi, Hyoung-Kee
    • Proceedings of the Korea Information Processing Society Conference
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    • pp.1003-1005
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    • 2007
  • WCDMA서비스가 본격적으로 활성화됨에 따라 WCDMA와 WLAN을 동시에 연결할 수 있는 단말들의 출시도 늘어나고 있다. Multi-home은 Transport Layer에서 이러한 연동을 지원하게 해주는 기능이다. 본 논문에서는 Multi-home을 지원하는 TCP-MH와 SCTP 프로토콜을 WCDMA-WLAN 연동 시나리오에 적용시켜 분석하였다. SCTP는 TCP-MH에 비해 폭넓은 활용도를 보여주었다.

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Analysis of SNR gain of the Receiver Filter in WCDMA (WCDMA환경의 수신기 필터에 의한 SNR이득 분석과 최적구조 도출)

  • Jeon, Hyeon-Jin;Chang, Tae-Gyu
    • Proceedings of the KIEE Conference
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    • pp.283-285
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    • 2007
  • 본 논문에서는 WCDMA 환경에서의 수신기 Filter에 의한 SNR개선에 대해 연구하였다 WCDMA환경에서 여러 사용자의 다중경로 신호들이 더해져서 수신되는데 원하는 사용자에 동기를 맞춰 chip rate의 정수배로 sampling하고 수신기 필터를 통과시킴으로써 배율 정도에 따른 이득을 얻게 된다. 하지만 송신 신호의 pulse shape에 따라 이득이 달라진다. pulse shape에 따라 필터에 대한 윈하는 사용자 신호와 AWCN의 아득이 서로 달라지고 SNR이득이 포화되는 시점도 다르기 때문이다. 따라서 pulse shape에 따라 최적의 SNR이득을 얻기 위한 최적의 sampling 배출을 구할 수 있다. 분 논문에서는 signal shape에 따른 SNR 이득에 대해 해석식 도출 및simulation을 통해 최적 수신기 구조를 도출하였다.

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A Case Study on Performance Evaluation of R5 MSC in WCDMA System (WCDMA R5 MSC 시스템 성능 평가 사례 연구)

  • Kim, Dae-Geun;Kim, Hyoung-Taek;Ahn, Gil-Whan
    • 한국정보통신설비학회:학술대회논문집
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    • pp.264-268
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    • 2007
  • This article presents the performance evaluation case study of circuit-switched WCDMA R5MSC(Mobile Switching Center) Server and CS-MGW(Circuit Switched Media Gateway) in 3'rd generation mobile telecommunication (UMTS : Universal Mobile Telecommunication System). The presented work adopted circuit switching scenarios recommended by 3GPP(Third Generation Partnership Project) and terrestrial spectrum calculation parameters and its values defined in ITU-R M.2023 and M.1390 to do the case study on performance evaluation of circuit switched system (R5 MSC Server and CS-MGW) in WCDMA core network. This paper describes test results by using simulator which substitutes for wireless section (MS, Node-B, RNC).

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Design of a Current-Mode Analog Filter for WCDMA Baseband Block (WCDMA 베이스밴드단 전류모드 아날로그 필터 설계)

  • Kim, Byoung-Wook;Bang, Jun-Ho;Cho, Seong-Ik;Choi, Seok-Woo;Kim, Dong-Yong
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.57 no.3
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    • pp.255-259
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    • 2008
  • In this paper, a current-mode integrator for low-voltage, low-power analog integrated circuits is presented. Using the proposed current-mode integrator, the baseband analog filter is designed for WCDMA wireless communication. To verify the proposed current-mode integrator circuit, Hspice simulation using 1.8V TSMC $0.18{\mu}m$ CMOS parameter is performed and achieved 44.9dB gain, 15.7MHz unity gain frequency. The described 3rd-order current-mode baseband analog filter is composed of the proposed current-mode integrator, and SFG(Signal Flow Graph) method is used to realize the baseband filter. The simulated results show 2.12MHz cutoff frequency which is suitable for WCDMA baseband block.

Design a dual-band antenna for GSM/WCDMA (GSM/WCDMA 이중대역 안테나 설계)

  • Ko, Hyun-Jung;Kim, Won-Kyu;Lee, Vea-O;Shin, Jae-Cheol;Lee, Hak-Yong;Chung, Young-Seek;Cheon, Chang-Yul
    • 한국정보통신설비학회:학술대회논문집
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    • pp.433-436
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    • 2008
  • In this paper, a novel compact broadband dual frequency microstrip antenna is presented. The meander type patch has been designed to have dual resonant frequencies, and the ground with slot was employed to expand the bandwidth in WCDMA band. The simulated results were obtained using HFSS, and the measurement on the proposed antenna was conducted in an anechoic chamber equipped with a network analyzer and a far field measurement system. As a result, measured maximum gain of antenna is 2.07$\sim$2.87 dBi in the GSM band and 3.91$\sim$5.61 dBi in the WCDMA band.

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A Study on the Multi-band MIMO Antenna with MD material for Next-generation Mobile Communication (MD 매질을 이용한 차세대 이동통신 단말기용 다중대역 MIMO 안테나 설계 및 구현)

  • Kim, Woo-Su;Yoon, Cheol;Lee, Won-Jong;Kang, Suk-Youb;Park, Hyo-Dal
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.14 no.4
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    • pp.983-990
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    • 2010
  • In this paper, we designed and implemented the MIMO antenna for LTE(Long Term Evolution), supposed to be a next generation communications network, DCS1800, DCS1900 and WCDMA. Using conventional monopole antenna with MD material results in good characteristics, miniaturization for LTE band and as well as broadbanding for DCS, WCDMA band. The performance of the proposed MIMO antenna shows VSWR < 2, under -10 dB of isolation and the gain is -1.66 ~ 1.33 dBi for LTE(Long Term Evolution), DCS1800, DCS1900 and WCDMA, which has omnidirectional radiation pattern.

WCDMA Simulator Engine for 3G Wireless Network

  • Rashld Zainol Abidin Abdul;Ramaiah Karamchand Babu Atchitha
    • Journal of The Institute of Information and Telecommunication Facilities Engineering
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    • v.2 no.3
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    • pp.36-47
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    • 2003
  • Wideband Code Division Multiple Access (WCDMA) is one of the air interface techniques proposed for the third generation (3G) mobile communication system. WCDMA was selected because it fulfills the IMT-2000 requirements for higher data rate trans mission, support of multimedia capabilities and other flexible services due to its variable bit rates and larger bandwidth, improved capacity and coverage, efficient power control and support for advanced and improved detector structures. Performance evaluation of 3G wireless network through simulation plays an important role in the design and implementation of the actual system, aiding the wireless system designer by providing them the necessary performance conformance statistics prior to implementation. In accordance with this goal, a simulator engine was developed entirely on a MATLAB platform to emulate the behaviour of the WCDMA air interface for both the uplink and downlink in a real world fading mobile environment. This paper discuss the development of the simulator along with a brief description of its functionalities and user interface. The WCDMA air interface mode focused in this paper is in accordance to the 3GPPs frequency division duplex (FDD) mode and restricted to the physical layer description. Performance results for the selected cases for the downlink, uplink, varying mobile velocity and sampling rates are also provided.

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Design and Implementation of Down-Converter for WCDMA Digital Optic Repeater (WCDMA 디지털 광 중계기용 Down-Converter 설계 및 제작)

  • 김성수;강원구;장인봉;양승인
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.14 no.9
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    • pp.974-978
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    • 2003
  • The down-converter of the WCDMA Digital Optic Repeater is developed. Based on the system specifications, the structure of the down-converter is accomplished and its block diagram is drawn. The down-converter is implemented according to these block diagrams. Subsequently a low pass filter, an automatic level controlled attenuator, a frequency synthesizer and other components for the down-converter are designed and implemented, and a main board to integrate these modules is also manufactured. To reduce the noise floor of system and suppress the RF spurious noise, a PCB layout is performed carefully. For each module consisting of the down-converter and the entire system, the performance tests are accomplished to check the performance about the specifications.