• Title/Summary/Keyword: WCDMA

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High Level Design and Performance Evaluation for the Implementation of WCDMA Base Station Modem (WCDMA 기지국 모뎀의 구현을 위한 상위 레벨 설계 및 통합 성능 평가)

  • Do Joo-Hyun;Lee Young-Yong;Chung Sung-Hyun;Choi Hyung-Jin
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.30 no.1A
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    • pp.10-27
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    • 2005
  • In this paper, we propose a high level design architecture of WCDMA(UMTS) base station modem and synchronization algorithms applied to the proposed architecture. Also analysis of each synchronization algorithm and performance evaluation of fixed point designed modem are shown. Since the target system is base station modem, each synchronization algorithm is designed for its stable operation. To minimize implementation complexity, optimum fixed point design for best operation of synchronization algorithms is performed. We performed symbol level link simulation with fixed point designed modem simulator for data rate of 12.2kbps, 64kbps, 144kbps, and 384kbps. We compared performance results to the minimum requirements specified in 3GPP TS 25.104(Release 5). Extensive computer simulation shows that the proposed modem architecture has stable operation and outperform the minimum requirement by 2 dB. The proposed modem architecture has been applied in the implementation of WCDMA reverse link receiver modem chip successfully.

Adjacent Interference Analysis between M-WiMAX OFDMA/TDD and WCDMA FDD System in the 2.6 GHz Band Part I : Adjacent Interference Analysis in SISO System (2.6 GHz 대역에서 M-WiMAX OFDMA/TDD 시스템과 WCDMA FDD 시스템간의 상호 간섭 분석 Part I : SISO 시스템에서의 상호 간섭 분석)

  • Ko, Sang-Jun;Wang, Yu-Peng;Chang, Kyung-Hi
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.32 no.6A
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    • pp.573-587
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    • 2007
  • In this paper, we analyze the adjacent interference between WCDMA and M-WiMAX systems in the 2.6GHz Band under the SISO (Single Input Single Output) configuration. The interference scenarios are characterized into 8 scenarios with different victim and interfering links. Among the 8 scenarios, we find that the most performance loss is observed in the scenarios of victim uplink suffering interference from downlink in both systems. Besides, guard band is applied to mitigate the adjacent interference in all the scenarios. Especially, we reveal that M-WiMAX system is much more sensitive to adjacent interference than WCDMA system due to the lower transmission power. In this paper, we consider the worst interference environment, where interferers always transmit with the maximum power, a loose spectrum mask is adapted, and no additional channel fitters are equipped in both systems.

Adjacent Interference Analysis between M-WiMAX OFDMA/TDD and WCDMA FDD System in the 2.6 GHz Band Part II : Adjacent Interference Analysis with Smart Antenna in M-WiMAX System (2.6 GHz 대역에서 M-WiMAX OFDMA/TDD 시스템과 WCDMA FDD 시스템간의 상호 간섭 분석 Part II : Adjacent Interference Analysis with Smart Antenna in M-WiMAX System)

  • Wang, Yu-Peng;Ko, Sang-Jun;Chang, Kyung-Hi
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.32 no.6A
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    • pp.588-599
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    • 2007
  • This paper presents the coexistence issues between M-WiMAX TDD and WCDMA FDD systems. To improve the M-WiMAX system performance and to reduce the adjacent channel interference to WCDMA FDD system, transmit and receive beamforming techniques are applied in the base stations of M-WiMAX system. Furthermore, we propose an adjacent channel interference modeling methodology, which captures the effect of transmit beamforming on the adjacent channel interference. Besides, we verify the performance improvement in the uplink of WCDMA system due to the transmit beamforming in M-WiMAX downlink based on the proposed adjacent channel interference modeling methodology. We also verify the performance enhancement due to the receive beamforming in the uplink of M-WiMAX system through system level Monte Carlo simulations, considering random user position, the effect of shadowing and multi-path fading channel. Discussions on the gain of applying transmit and receive beamforming in M-WiMAX system comparing the case of SISO system are also included. Furthermore, we present the performance of cosited M-WiMAX and WCDMA systems, considering commercial deployment, additional channel filter at base stations and the effects of TxBF and RxBF.

Quality-Enhancement Technique on Video telephony over WCDMA Network (WCDMA망상에서 영상통화의 품질향상 기법)

  • Kim, Yo-Han;Kwak, Hyong-Won;Shin, Ji-Tae
    • Journal of Broadcast Engineering
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    • v.13 no.1
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    • pp.25-33
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    • 2008
  • Video telephony is a representative service in 3G mobile network. And there have been efforts to improve quality of video telephony service in different fields. In Korea, the leading mobile service provider SKTelecom and KTF service the WCDMA network as 3G mobile network. Now, more than a million people is using the network. In this paper, we study about video telephony over WCDMA network. and propose error minimizing algorithm using cross-layer adaptation between physical layer and video codec. We simulated 3G-324M protocol with MPEG-4 video codec, and simulation results show suggested algorithm improve packet transmission rate for improving quality of video telephony service.

Normalized CP-AFC with multistage tracking mode for WCDMA reverse link receiver (다단 추적 모드를 적용한 WCDMA 역방향 링크 수신기용 Normalized CP-AFC)

  • Do, Ju-Hyeon;Lee, Yeong-Yong;Kim, Yong-Seok;Choe, Hyeong-Jin
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.39 no.8
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    • pp.14-25
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    • 2002
  • In this paper, we propose a modified AFC algorithm which is suitable for the implementation of WCDMA reverse link receiver modem. To reduce the complexity, the modified CP-FDD algorithm named 'Normalized CP-FDD' is applied to the AFC loop. The proposed FDD algorithm overcomes the conventional CP-FDD's sensitivity to the variance of input signal amplitude and increases the linear range of S -curve. Therefore, offset frequency estimation using the proposed scheme can be more stable than the conventional method. Unlike IS-95, since pilot symbol in WCDMA is not transmitted continuously, we introduce a moving average filter at the FDD input to increase the number of cross-product. So, tracking speed and stability are improved. For more rapid frequency acquisition and tracking, we adopt a multi-stage tracking mode. Using NCO having ROM table structure, the frequency offset is compensated. We applied the proposed algorithm in the implementation of WCDMA base station modem successfully.

WCDMA에서의 IP Security 기술 동향 분석

  • 이상윤;김형택;연철흠
    • Information and Communications Magazine
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    • v.22 no.9
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    • pp.164-174
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    • 2005
  • 본 논문은 비동기 방식의 WCDMA 시스템에서 특히 IP Multimedia Subsystem의 도입과 함께 IP Security 기술이 어떤 형식으로 적용되어 표준화되고 있는지 기술동향을 알아보고자 한다. 현재 WCDMA 시스템에서의 IP Security 기술은 일반 네트워크 영역 보안 분야와 WLAN Inter-working 분야 그리고 IMS 보안 분야에 적용되고 있다. 가장 기본이 되는 네트워크 영역 보안은 3GPP 표준화 규격인 TS 33.210에 정의되어 있고, 이를 바탕으로 WLAN Inter-working 분야에서는 IKE version 2가 추가되었으며, IMS 보안 분야에서는 네트워크 영역 보안에서 정의된 Z 인터페이스를 이용하여 해당 트래픽에 대한 보안을 수행한다.

SDR Approach for WCDMA system (WCDMA SDR의 접근 방법)

  • 김태규;박신종
    • Proceedings of the IEEK Conference
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    • pp.395-398
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    • 2002
  • 본 논문은 Global loaming, backward compatibility, 그리고 multi-standard가 요구되는 미래의 통신시스템에 대한 해답인 Software Defined Radio에 관한 글로서 SDR의 개념과, 그 접근 방법에 대해서 논하고자 한다. 특히 3세대 이동통신인 WCDMA system을 모델로 하여, 그 접근방법에 대해 살펴본다. SDR의 발전은 크기, 무게, 전력소모의 문제와, 전용의 하드웨어 없이 동작할 때의 성능저하를 문제를 해결해야 한다. 여기서 그 해결방안으로 SoC와 Multi-CPU의 방법을 제시하고자 한다.

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A Novel Digital Automatic Gain Control for a WCDMA Receiver

  • Kim, Kyusheob;Sungbin Im;Kim, Chonghoon
    • Proceedings of the IEEK Conference
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    • pp.1358-1361
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    • 2002
  • In this paper, we propose a new architecture of digital automatic gain control (AGC) for a wideband code division multiple access (WCDMA) receiver. The feature of the proposed architecture is simplicity, in that it does not utilize complicated mathematical functions such as log and its inverse. When the proposed algorithm is implemented using a field programmable gate array (FPGA) device, the number of slices used to implement is 130 over the total of 5120 slices (less than 3%) with 61.44 ㎒ clock. This algorithm has been successfully applied to commercial WCDMA base stations.

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A Study on the Reverse Link Beamforming for the WCDMA System (WCDMA 역방향 링크에 대한 빔포밍 적용에 관한 연구)

  • Lee, Jae-Sik;Kim, Chong-Yun;Chang, Tae-Gyu
    • Proceedings of the KIEE Conference
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    • pp.2502-2504
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    • 2001
  • 본 논문은 WCDMA 시스템의 역방향 링크에서의 빔포밍 적용에 관하여 기술하였다. 제안된 빔포밍 구조는 제어채널의 파일럿 심볼을 이용한 빔포밍 계수 계산과 데이터 채널에 적용하는 분리구조를 가지고 있다. 적응 빔포밍의 대표적 방식인 LMS 알고리즘과 steering 알고리즘을 적용하여 성능 분석과 시뮬레이션을 수행하였으며, 다양한 환경 변수에 따른 시뮬레이션 결과는 빔포밍 알고리즘의 구현과 설계에 있어 중요한 지침을 주리라 기대된다.

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