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Advanced A-law employing nonlinear distortion reduction in DCO-OFDM systems DCO-OFDM系统中采用非线性失真抑制的先进a律
2015 IEEE/CIC International Conference on Communications in China - Workshops (CIC/ICCC) Pub Date : 2015-11-01 DOI: 10.1109/ICCChinaW.2015.7961604
Xiaojing Zhang, Peng Liu, Jiang Liu, Song Liu
{"title":"Advanced A-law employing nonlinear distortion reduction in DCO-OFDM systems","authors":"Xiaojing Zhang, Peng Liu, Jiang Liu, Song Liu","doi":"10.1109/ICCChinaW.2015.7961604","DOIUrl":"https://doi.org/10.1109/ICCChinaW.2015.7961604","url":null,"abstract":"In this paper, an advanced A-law nonlinear companding algorithm is employed to reduce the nonlinear distortions from the light emitting diode (LED) on visible light communication (VLC) systems. The nonlinear transfer characteristics of LEDs are not identical. But the transfer effect of an LED can be modeled as a linear transfer range with the maximum and minimum forward voltages. Therefore, the signal will be truncated when the signal amplitude is larger than the maximum limit or smaller than the minimum limit. The advanced A-law companding algorithm can concentrate the signal amplitude to the limited linear transfer range and decrease the truncation distortion. We evaluate the performance of the proposed advanced A-law companding algorithm comparing with typical A-law and uncompanded schemes via simulations in the direct current biased optical orthogonal frequency division multiplexing (DCO-OFDM) system. Experimental results demonstrate that the advanced A-law companding algorithm can effectively alleviate the nonlinear distortion of the DCO-OFDM system in terms of system bit error ratio (BER) performances.","PeriodicalId":121194,"journal":{"name":"2015 IEEE/CIC International Conference on Communications in China - Workshops (CIC/ICCC)","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121949530","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
A Context-aware Data Processing Model in power communication networks 电力通信网络中上下文感知数据处理模型
2015 IEEE/CIC International Conference on Communications in China - Workshops (CIC/ICCC) Pub Date : 2015-11-01 DOI: 10.1109/ICCChinaW.2015.7961603
Yunfei Guo, Kun Wang, Shidong Liu, Jinghong Guo, Heng Lu
{"title":"A Context-aware Data Processing Model in power communication networks","authors":"Yunfei Guo, Kun Wang, Shidong Liu, Jinghong Guo, Heng Lu","doi":"10.1109/ICCChinaW.2015.7961603","DOIUrl":"https://doi.org/10.1109/ICCChinaW.2015.7961603","url":null,"abstract":"The power communication networks is a relatively complex system with high security, which is performed in a number of ways, such as safety of power generation equipment, security of transmission and distribution lines, as well as data transmission security. The core of power communication networks security is context-aware data processing. With continuously extending in scale of the power communication networks, power communication data process become more complicated. In order to realize automatization of data processing of the power communication networks, this paper proposed a Context-aware Data Processing Model in power communication networks (CDPM). In this three-layer architecture, a Distributed Database Based on Data Categorization (DDB-DC) is designed in storage layer, which is able to choose the most efficient approach to store the context-aware data from the gathering layer according to different context-aware data types. Then, a Real-time Feature Extraction algorithm (RFE) for context-aware systems is presented in the computing layer to process the context-aware data stream. The model is a new data processing method in power communication networks.","PeriodicalId":121194,"journal":{"name":"2015 IEEE/CIC International Conference on Communications in China - Workshops (CIC/ICCC)","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121989923","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
Analysis of BD precoding for distributed large-scale MIMO systems with RF mismatches at UEs 分布大规模MIMO系统在ue处射频失配的BD预编码分析
2015 IEEE/CIC International Conference on Communications in China - Workshops (CIC/ICCC) Pub Date : 2015-11-01 DOI: 10.1109/ICCChinaW.2015.7961578
Meng Yang, Hao Wei, Dongming Wang
{"title":"Analysis of BD precoding for distributed large-scale MIMO systems with RF mismatches at UEs","authors":"Meng Yang, Hao Wei, Dongming Wang","doi":"10.1109/ICCChinaW.2015.7961578","DOIUrl":"https://doi.org/10.1109/ICCChinaW.2015.7961578","url":null,"abstract":"To avoid the heavy overhead of the pilots and feedback, the time division duplex (TDD) operation is used due to the channel reciprocity. When multiple antennas are equipped at the user equipments (UEs), the radio access units (RAUs) can use the block diagonalization (BD) precoding to improve the system performance. However, the mismatches of the radio frequency (RF) circuits at both sides of the links make the whole communication channels non-symmetric in practical systems. And it may be not enough to only perform calibration at the RAUs. In this paper, we focus on the RF mismatches at the UEs for the large-scale distributed MIMO systems with BD precoding. According to the theoretical analysis and simulation results, we find that the RF mismatches at the UEs still lead to a negligible performance loss although the partial calibration has been performed at the RAUs. And It is strongly suggested that reciprocity calibration should be performed at both the RAUs and the UEs.","PeriodicalId":121194,"journal":{"name":"2015 IEEE/CIC International Conference on Communications in China - Workshops (CIC/ICCC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129780942","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
Novel IGC codes with inter-subset zero-correlation zone for code division multiple access 基于子集间零相关带的码分多址IGC新码
2015 IEEE/CIC International Conference on Communications in China - Workshops (CIC/ICCC) Pub Date : 2015-11-01 DOI: 10.1109/ICCChinaW.2015.7961571
Longye Wang, Xiaoli Zeng, Fei Pan, Yongfeng Li, Lin Hu
{"title":"Novel IGC codes with inter-subset zero-correlation zone for code division multiple access","authors":"Longye Wang, Xiaoli Zeng, Fei Pan, Yongfeng Li, Lin Hu","doi":"10.1109/ICCChinaW.2015.7961571","DOIUrl":"https://doi.org/10.1109/ICCChinaW.2015.7961571","url":null,"abstract":"With the aid of interleaving operations, a novel construction of inter-group complementary (IGC) codes is proposed based on perfect complementary (PC) codes and orthogonal matrices. The presented IGC codes which consists of multiple groups with multiple subsets and each subset is a Z-complementary codes. For the novel IGC code, its cross-correlation function (CCF) between any two codes of different subsets in the same groups have a wider zero correlation zone (ZCZ) than that of any two codes in the same subset and its CCF between any two codes of different groups are zeros everywhere. IGC codes based code division multiple access (CDMA) systems may perform better on bit error rates than conventional codes based traditional interference-limited CDMA systems. Moreover, the new IGC codes may work well in both synchronous and asynchronous operational modes.","PeriodicalId":121194,"journal":{"name":"2015 IEEE/CIC International Conference on Communications in China - Workshops (CIC/ICCC)","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133754375","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
ICD reciprocity calibration for distributed large-scale MIMO systems with BD precoding 基于BD预编码的分布式大规模MIMO系统的ICD互易校准
2015 IEEE/CIC International Conference on Communications in China - Workshops (CIC/ICCC) Pub Date : 2015-11-01 DOI: 10.1109/ICCChinaW.2015.7961594
Hao Wei, Dongming Wang, X. You
{"title":"ICD reciprocity calibration for distributed large-scale MIMO systems with BD precoding","authors":"Hao Wei, Dongming Wang, X. You","doi":"10.1109/ICCChinaW.2015.7961594","DOIUrl":"https://doi.org/10.1109/ICCChinaW.2015.7961594","url":null,"abstract":"Time division duplexing (TDD) operation is usually used for distributed large-scale multiple-input multiple-output (MIMO) systems to perform the downlink precoding by the uplink channel estimation due to the channel reciprocity. However, the channel reciprocity is often disabled by the non-symmetric transceiver radio frequency (RF) circuits at both sides of the link. This paper is focused on the reciprocity calibration for the distributed large-scale MIMO systems where both access points (APs) and user equipments (UEs) have multiple antennas. Theoretical analysis show that RF mismatches at the UEs still bring the inter-stream interference (ISI) and lead to a significant performance loss, although with the perfect partial calibration. Then, to avoid eigenvalue decomposition (EVD) operation of the total least squares (TLS) method, an iterative algorithm named as iterative coordinate descent (ICD) method is proposed to perform the full calibration, which significantly reduces the complexity and essentially achieves the performance of the TLS method.","PeriodicalId":121194,"journal":{"name":"2015 IEEE/CIC International Conference on Communications in China - Workshops (CIC/ICCC)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122646203","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: 3
A low-complexity 3D MU-MIMO downlink scheme based on two-step precoding 一种基于两步预编码的低复杂度3D MU-MIMO下行方案
2015 IEEE/CIC International Conference on Communications in China - Workshops (CIC/ICCC) Pub Date : 2015-11-01 DOI: 10.1109/ICCChinaW.2015.7961597
Jie Li, Guomei Zhang, Gangming Lv, Fei Xiang
{"title":"A low-complexity 3D MU-MIMO downlink scheme based on two-step precoding","authors":"Jie Li, Guomei Zhang, Gangming Lv, Fei Xiang","doi":"10.1109/ICCChinaW.2015.7961597","DOIUrl":"https://doi.org/10.1109/ICCChinaW.2015.7961597","url":null,"abstract":"The emergence of Internet of Things (IoT), which connects billions of smart devices together wirelessly, has brought great pressure on capacity of current wireless networks. Fortunately, a new technology, three-dimension multiple-input multiple-output (3D-MIMO), with a large number of active antennas equipped in a 2D planar array, has been shown significant potential in improving system capacity. A problem is that with the number of antennas increasing, the complexity of the conventional multi-user (MU) precoding algorithms increase rapidly. To cope with this problem, a two-step 3D MU-MIMO precoding scheme is proposed to suppress the interference not only in horizontal but also in vertical domain in this paper. Meanwhile, considering the strong correlations of channel matrices in vertical dimension for different users, we adopt chordal distance-based user selection algorithm to find the users with correlations of the vertical antennas' channels as low as possible for the first step precoding. Simulation results show that the proposed transmission scheme combining two-step precoding with user selection in vertical dimension can achieve better cell average spectrum efficiency.","PeriodicalId":121194,"journal":{"name":"2015 IEEE/CIC International Conference on Communications in China - Workshops (CIC/ICCC)","volume":"98 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116444273","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
Joint power and subcarrier allocation using auction games for secure multiuser OFDMA networks 基于竞价游戏的多用户OFDMA网络联合功率和子载波分配
2015 IEEE/CIC International Conference on Communications in China - Workshops (CIC/ICCC) Pub Date : 1900-01-01 DOI: 10.1109/iccchinaw.2015.7961598
{"title":"Joint power and subcarrier allocation using auction games for secure multiuser OFDMA networks","authors":"","doi":"10.1109/iccchinaw.2015.7961598","DOIUrl":"https://doi.org/10.1109/iccchinaw.2015.7961598","url":null,"abstract":"Security is a critical issue in downlink multiuser orthogonal frequency division multiplexing access (OFDMA) networks. In this paper, we propose a joint power and subcarrier allocation algorithm to maximize secrecy rate. Specifically, we propose an iterative scheme to allocate transmit power for each subcarrier under the transmit power constraint. Furthermore, we propose two auction-based algorithms, i.e. Frist-price Sealed-bid Auction and Flexible-language Combinatorial Auction, to allocate the subcarrier among multiusers. Finally, simulation results are provided to indicate that the First-price Sealed-bid Auction has a better performance in improving the system secrecy rate while the Flexible-language Combinatorial Auction reflects more fairness among users in the subcarrier distribution. In addition, the flexible bidding language in the combinatorial auction is proved to achieve a higher secrecy rate than the traditional bidding language.","PeriodicalId":121194,"journal":{"name":"2015 IEEE/CIC International Conference on Communications in China - Workshops (CIC/ICCC)","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115373751","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
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