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2006 Asia-Pacific Conference on Communications最新文献

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Area Efficient Pipelined VLSI Implementation of List Sphere Decoder 列表球解码器的区域高效流水线VLSI实现
2006 Asia-Pacific Conference on Communications Pub Date : 2006-12-11 DOI: 10.1109/APCC.2006.255901
Jin Lee, Sin-Chong Park
{"title":"Area Efficient Pipelined VLSI Implementation of List Sphere Decoder","authors":"Jin Lee, Sin-Chong Park","doi":"10.1109/APCC.2006.255901","DOIUrl":"https://doi.org/10.1109/APCC.2006.255901","url":null,"abstract":"Since finding the nearest point in a lattice for multi-input multi-output (MIMO) channels is NP-hard, simplified algorithms such as sphere decoder (SD) have been proposed. List sphere decoder (LSD), which is a modified version of SD, allows soft information to be extracted for channel decoding and iterative detection/decoding. In this paper, recently proposed efficient methods for reducing the computational complexity of SD and LSD with depth-first tree searching are summarized. Based on theses methods, VLSI implementation with an efficient pipelined architecture for LSD with real-valued operation for area efficiency is also presented","PeriodicalId":205758,"journal":{"name":"2006 Asia-Pacific Conference on Communications","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116027014","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
Performance and Complexity Comparison of the Schemes to Increase Data Rate in MIMO-OFDM with Various Decoding Schemes MIMO-OFDM中不同解码方案提高数据速率的性能和复杂度比较
2006 Asia-Pacific Conference on Communications Pub Date : 2006-12-11 DOI: 10.1109/APCC.2006.255941
Seungbeom Lee, Jin Lee, Sin-Chong Park
{"title":"Performance and Complexity Comparison of the Schemes to Increase Data Rate in MIMO-OFDM with Various Decoding Schemes","authors":"Seungbeom Lee, Jin Lee, Sin-Chong Park","doi":"10.1109/APCC.2006.255941","DOIUrl":"https://doi.org/10.1109/APCC.2006.255941","url":null,"abstract":"Multiple input multiple output-orthogonal frequency division multiplexing (MIMO-OFDM) is regarded as a promising technology enabling higher data rate wireless communications in multi-path fading channels. To achieve higher data rate, MIMO-OFDM use increasing the number of antenna from 2 up to 4, higher modulation schemes, or both of these technologies. In addition, there are several decoding schemes for MIMO-OFDM system. The performance and complexity of the MIMO-OFDM receiver depend on modulation type, the number of antenna and decoding schemes. This paper analyzes the complexity and performance tradeoff between two above technologies for increasing data rate in MIMO-OFDM system with varios decoding schemes such as MMSE, list square decoding (LSD), and iterative decoding with LSD. Convolutional code (R=1/2, K=7) is used as outer channel code","PeriodicalId":205758,"journal":{"name":"2006 Asia-Pacific Conference on Communications","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124239209","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
A decision feedback equalizer reducing error propagations in DTV Receivers 一种减少数字电视接收机误差传播的决策反馈均衡器
2006 Asia-Pacific Conference on Communications Pub Date : 2006-12-11 DOI: 10.1109/APCC.2006.255816
Kyoungwon Lee, Y. Oh, D. Kim
{"title":"A decision feedback equalizer reducing error propagations in DTV Receivers","authors":"Kyoungwon Lee, Y. Oh, D. Kim","doi":"10.1109/APCC.2006.255816","DOIUrl":"https://doi.org/10.1109/APCC.2006.255816","url":null,"abstract":"In the DFE for ATSC DTV receivers, there are decision errors in the slicer or the simplified trellis decoder, and these decided false data comes to the feedback filter to make the error propagation phenomenon. The error propagation degrades the equalizer performance by increasing residual errors as well as slowing down the convergence rate. In this paper we propose a dual-feedback equalization structure. There are two feedback filters. One is the decision feedback filter which uses the simplified trellis decoder output data, the other is non-decision feedback filter which uses the equalizer output data. The additional non-decision feedback filter doesn't introduce the error propagation, so it can compensate the error propagation. The proposed structure accelerates the convergence rate as well as reduces output men-square error (MSE). We analyzed the performance enhancement of DTV receiver using dual-feedback equalization structure","PeriodicalId":205758,"journal":{"name":"2006 Asia-Pacific Conference on Communications","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121743607","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
CDMA Receiver Using Neural Network 基于神经网络的CDMA接收机
2006 Asia-Pacific Conference on Communications Pub Date : 2006-12-11 DOI: 10.1109/APCC.2006.255807
S. Kanotai, Y. Rangsanseri
{"title":"CDMA Receiver Using Neural Network","authors":"S. Kanotai, Y. Rangsanseri","doi":"10.1109/APCC.2006.255807","DOIUrl":"https://doi.org/10.1109/APCC.2006.255807","url":null,"abstract":"This research presents a new structure of neural network based direct sequence code division multiple access (DS-CDMA) receiver. In CDMA system, near-far problem is a major impediment for the performance of conventional detector. In this paper we propose a back-propagation neural network (BPNN) based method that has the capability to combat the near-far and multiple user interference (MUI) problems. A comparative study between the conventional match filter and the neural network receiver is carried out using numerical method simulation. It was found that the proposed neural network receiver outperform the conventional receiver","PeriodicalId":205758,"journal":{"name":"2006 Asia-Pacific Conference on Communications","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117295004","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A Scalable FFT/IFFT Kernel for Modern Communication Systems using Codesign Approach 基于协同设计方法的现代通信系统可扩展FFT/IFFT内核
2006 Asia-Pacific Conference on Communications Pub Date : 2006-12-11 DOI: 10.1109/APCC.2006.255934
P. Potipantong, P. Sirisuk, T. Wiangtong, A. Worapishet
{"title":"A Scalable FFT/IFFT Kernel for Modern Communication Systems using Codesign Approach","authors":"P. Potipantong, P. Sirisuk, T. Wiangtong, A. Worapishet","doi":"10.1109/APCC.2006.255934","DOIUrl":"https://doi.org/10.1109/APCC.2006.255934","url":null,"abstract":"This paper presents a new architecture of scalable FFT processor using hardware/software codesign technique for orthogonal frequency division multiplexing (OFDM) systems. The architecture uses a radix-4 butterfly node located on both hardware and software processing elements. We employ an in-place memory strategy, resulting that the butterfly inputs and outputs can be stored at the same memory location without conflict. The memory is partitioned into 4 banks for pipelined computation. To demonstrate the codesign concept, 256-point FFT/IFFT is completed in a Xilinx Virtex-II Pro FPGA that contains PowerPC processor where the hardware is modeled by VHDL and the software is written in C. The proposed architecture achieves 256-point FFT in 10.56 mus, 64-point in 2.16 mus and 16-point in 480 ns making it viable for today's demanding OFDM applications","PeriodicalId":205758,"journal":{"name":"2006 Asia-Pacific Conference on Communications","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115161467","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Iterative Channel Estimation with Moving Average Filter in OFDM Packet Transmission System OFDM包传输系统中移动平均滤波器的迭代信道估计
2006 Asia-Pacific Conference on Communications Pub Date : 2006-12-11 DOI: 10.1109/APCC.2006.255831
Se-Bin Im, Hyung-Jin Choi, B. Yoon
{"title":"Iterative Channel Estimation with Moving Average Filter in OFDM Packet Transmission System","authors":"Se-Bin Im, Hyung-Jin Choi, B. Yoon","doi":"10.1109/APCC.2006.255831","DOIUrl":"https://doi.org/10.1109/APCC.2006.255831","url":null,"abstract":"In this paper, we propose a computationally efficient iterative channel estimation algorithm for orthogonal frequency division multiplexing (OFDM) systems. The minimum mean square error (MMSE) algorithm known for optimal channel estimation or the iterative maximum a-posteriori (MAP) channel estimation algorithm has an excellent performance but their complexities are very high because of the calculation of inverse matrix and covariance matrix. On the other hand, the discrete Fourier transform (DFT)-based channel estimation algorithm is inferior to MMSE algorithm but it has the advantage of a relatively low complexity. We particularly focus on improving this DFT-based estimator by combing in iterative channel update with turbo decoding. The proposed algorithm uses a novel moving average filter in order to minimize the estimation error of the updated channel. Simulation results show that the proposed algorithm gives better performance compared with the original DFT-based algorithm","PeriodicalId":205758,"journal":{"name":"2006 Asia-Pacific Conference on Communications","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115723356","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
A Modified M-ary TH-PPM Ultra Wideband Communication System 一种改进的M-ary TH-PPM超宽带通信系统
2006 Asia-Pacific Conference on Communications Pub Date : 2006-12-11 DOI: 10.1109/APCC.2006.255870
Zhiquan Bai, Shaoyi Xu, Weihua Zhang, K. Kwak
{"title":"A Modified M-ary TH-PPM Ultra Wideband Communication System","authors":"Zhiquan Bai, Shaoyi Xu, Weihua Zhang, K. Kwak","doi":"10.1109/APCC.2006.255870","DOIUrl":"https://doi.org/10.1109/APCC.2006.255870","url":null,"abstract":"A modified M-ary time hopping pulse position modulation (TH-PPM) ultra wideband communication system is proposed in this paper. The system performance over additive white Gaussian noise (AWGN) channel is evaluated in the condition of perfect time synchronization and correlation receiver. In this system, the modified M-ary modulation is obtained by combining signal partitioning with the pulse position modulation. Three signal partitioning, ungerboeck partitioning (UP), block partitioning (BP) and mixed partitioning (MP), are investigated in this work. The modified scheme can make no increment in system complexity compared to the conventional M-ary time hopping pulse position modulation. To some extent, it can improve the system performance. The computer simulation and analysis shows that the modified M-ary TH-PPM system outperforms the conventional M-ary TH-PPM system","PeriodicalId":205758,"journal":{"name":"2006 Asia-Pacific Conference on Communications","volume":"520 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123046973","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Near-Maximum Likelihood Detection of MIMO Systems Using Error Detection Scheme Based Lattice Reduction 基于格约简的误差检测方案的MIMO系统近极大似然检测
2006 Asia-Pacific Conference on Communications Pub Date : 2006-12-11 DOI: 10.1109/APCC.2006.255908
Dong-jin Lee, Mea-Hwa Park, Y. Byun
{"title":"Near-Maximum Likelihood Detection of MIMO Systems Using Error Detection Scheme Based Lattice Reduction","authors":"Dong-jin Lee, Mea-Hwa Park, Y. Byun","doi":"10.1109/APCC.2006.255908","DOIUrl":"https://doi.org/10.1109/APCC.2006.255908","url":null,"abstract":"MLD (maximum likelihood detection) has shown optimum performance in MIMO systems. However, its complexity generally makes it impractical. To solve this problem, various techniques were proposed. LRAD (lattice-reduction-aided detection) was also proposed to improve the performance of MIMO systems. In this paper, we suggest error symbol detection and correction in symbols estimated by LRAD. In other words, the proposed system detects the first symbols by LRAD and searches error terms in the first detection symbols. And correct the error symbols by optimal or sub-optimal systems. As a result, its performance approaches more nearly to that of MLD which shows optimum performance, but it has much less complexity than MLD","PeriodicalId":205758,"journal":{"name":"2006 Asia-Pacific Conference on Communications","volume":"379 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115303951","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
MIMO Broadcast Transmission with Outdated Channel State Information 信道状态信息过时的MIMO广播传输
2006 Asia-Pacific Conference on Communications Pub Date : 2006-12-11 DOI: 10.1109/APCC.2006.255791
Kai Zhang, Z. Niu
{"title":"MIMO Broadcast Transmission with Outdated Channel State Information","authors":"Kai Zhang, Z. Niu","doi":"10.1109/APCC.2006.255791","DOIUrl":"https://doi.org/10.1109/APCC.2006.255791","url":null,"abstract":"The performance of multiuser MIMO downlink systems with block diagonalization (BD) relies on the channel state information (CSI) at the transmitter to a great extent. For time division duplex TDD systems, the transmitter estimates the CSI while receiving data at current time slot and then uses the CSI to transmit at the next time slot. When the wireless channel is time-varying, the CSI for transmission is imperfect due to the time delay between the estimation of the channel and the transmission of the data and severely degrades the system performance. In this paper, we propose a linear method to suppress the interferences among users and data streams caused by imperfect CSI at transmitter. The transmitter first sends pilot signals through a linear spatial precoding matrix so as to make possible that the receiver can estimate the interference, and then the receiver exploits a linear prefilter to suppress the interference. The numerical results show that the proposed schemes achieve obvious performance enhancement in comparison to the scheme assuming perfect CSI at the transmitter","PeriodicalId":205758,"journal":{"name":"2006 Asia-Pacific Conference on Communications","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129059216","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
Dynamic L2 Distribution based on Connection Priority for Enhanced Bandwidth Utilization 基于连接优先级的动态L2分配，提高带宽利用率
2006 Asia-Pacific Conference on Communications Pub Date : 2006-12-11 DOI: 10.1109/APCC.2006.255826
Tomoya Hatano, Yasunobu Kasahara, Shinichi Yoshihara, Toshiyuki Iwata, K. Kumozaki, Yoichi Maeda
{"title":"Dynamic L2 Distribution based on Connection Priority for Enhanced Bandwidth Utilization","authors":"Tomoya Hatano, Yasunobu Kasahara, Shinichi Yoshihara, Toshiyuki Iwata, K. Kumozaki, Yoichi Maeda","doi":"10.1109/APCC.2006.255826","DOIUrl":"https://doi.org/10.1109/APCC.2006.255826","url":null,"abstract":"Link aggregation, which was standardized by the IEEE 802.3ad Working Group, is the bonding of two or more links into a single link that appears as a single, higher-bandwidth logical link. In this paper, we propose Dynamic L2 distribution, which distributes the traffic among links according to the traffic situation and the connection priority in order to better utilize link bandwidth and to protect high priority traffic. Dynamic L2 distribution is designed to avoid link change of high priority traffic, minimize the number of link changeovers and equalize the number of link changeovers among low priority connections. To maximize efficiency, we consider and simulate the relation between bandwidth utilization and the control parameters of Dynamic L2 distribution","PeriodicalId":205758,"journal":{"name":"2006 Asia-Pacific Conference on Communications","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121967291","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
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