2005 IEEE 16th International Symposium on Personal, Indoor and Mobile Radio Communications最新文献

Decision directed scheme for IQ imbalance compensation on OFCDM direct conversion receiver OFCDM直接转换接收机IQ不平衡补偿的决策导向方案

2005 IEEE 16th International Symposium on Personal, Indoor and Mobile Radio Communications Pub Date : 2005-12-01 DOI: 10.1093/ietcom/e89-b.1.184

Tadaaki Yuba, Y. Sanada

引用次数: 16

Uplink Pre-Equalization Using MMSE Prediction for TDDIMC-CDMA Systems 基于MMSE预测的TDDIMC-CDMA系统上行链路预均衡

2005 IEEE 16th International Symposium on Personal, Indoor and Mobile Radio Communications Pub Date : 2005-12-01 DOI: 10.1109/PIMRC.2005.1651445

Yoshikazu Takei, T. Ohtsuki

{"title":"Uplink Pre-Equalization Using MMSE Prediction for TDDIMC-CDMA Systems","authors":"Yoshikazu Takei, T. Ohtsuki","doi":"10.1109/PIMRC.2005.1651445","DOIUrl":"https://doi.org/10.1109/PIMRC.2005.1651445","url":null,"abstract":"Recently, multi-carrier code-division multiple-access (MC-CDMA) has attracted much attention. To make smoothly connection with a base station (BS), time division duplex (TDD) systems using the reciprocity of uplink and downlink in the same frequency band is considered. If the coherence time is large compared with the duplexing time, TDD systems can provide the channel characteristics of uplink from that of downlink. Thus, the channel distortion can be compensated in advance as a pre-equalization at mobile terminals (MTs). The pre-equalization technique using zero-forcing equalization (ZFE) was proposed for the TDD/MC-CDMA system. The channel parameters obtained from the last pilot (LP) symbol in the downlink frame have the highest time correlations with the uplink channel parameters. Therefore, they can be used as the channel parameters of all the symbols in the following frame. However, when the coherence time is not so large compared with the duplexing time, it is expected that the system suffers from the channel mismatch by time-selective fading. In this paper, we propose a pre-equalization using MMSE channel prediction for TDD/MC-CDMA. As a derivation of the pre-equalization coefficients, we employ ZFE, controlled equalization (CE), and minimum mean square error equalization (MMSEE). Simulation results show that the proposed channel prediction techniques are effective on time-selective fading channels","PeriodicalId":248766,"journal":{"name":"2005 IEEE 16th International Symposium on Personal, Indoor and Mobile Radio Communications","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115156893","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: 6

Influence of sampling jitter on discrete time receiver 采样抖动对离散时间接收机的影响

2005 IEEE 16th International Symposium on Personal, Indoor and Mobile Radio Communications Pub Date : 2005-12-01 DOI: 10.1109/PIMRC.2005.1651871

M. Inamori, A. Bostamam, Y. Sanada

引用次数: 1

Split multi-path routing protocol with load balancing policy (SMR-LB) to improve TCP performance in mobile ad hoc networks 采用负载均衡策略(SMR-LB)拆分多路径路由协议，提高移动自组网中TCP的性能

2005 IEEE 16th International Symposium on Personal, Indoor and Mobile Radio Communications Pub Date : 2005-12-01 DOI: 10.1093/ietcom/e89-b.5.1517

Takeshi Murakami, M. Bandai, I. Sasase

引用次数: 18

Packet scheduling algorithm to improve throughput and fairness in SDM system using adaptive antenna array 采用自适应天线阵列的分组调度算法提高SDM系统的吞吐量和公平性

2005 IEEE 16th International Symposium on Personal, Indoor and Mobile Radio Communications Pub Date : 2005-12-01 DOI: 10.1109/PIMRC.2005.1651825

N. Yoshimochi, Y. Ofuji, S. Abeta, R. Esmailzadeh, I. Sasase

{"title":"Packet scheduling algorithm to improve throughput and fairness in SDM system using adaptive antenna array","authors":"N. Yoshimochi, Y. Ofuji, S. Abeta, R. Esmailzadeh, I. Sasase","doi":"10.1109/PIMRC.2005.1651825","DOIUrl":"https://doi.org/10.1109/PIMRC.2005.1651825","url":null,"abstract":"This paper investigates several downlink packet scheduling algorithms in OFDM based systems for space division multiplexing (SDM) with adaptive antenna array beamforming. The packet scheduling algorithm, which generates directional beams toward accessing users in accordance with the priority based on received signal-to-interference plus noise power ratio (SINR) have been proposed. However, the algorithm can generate few directional beams due to the increase of inter beam interference. As a result, the improvement of overall capacity is limited. In this paper, we propose an algorithm to increase total throughput by increasing the number of directional beams. In our algorithm, difference of angle and interference among directional beams are considered. It is shown that the proposed algorithm can increase the sector throughput by 13 % as compared to the conventional SINR-priority based algorithm. Moreover, we investigate the effect to take into account the channel quality and waiting time of each user in the proposed algorithm from the viewpoint of the sector throughput and the fairness of transmission slot assignment probability. Simulation results show that the proposed algorithm with taking into account the received SINR averaged over the scheduled users improves the sector throughput by 5-10% as compared to the original proposed algorithm. It is also shown that, additionally taking into account the waiting time of the users, although the sector throughput is degraded by 12%, the number of users who have the transmission slot assignment probability of less than 0.1 is reduced by 26% compared to the original proposed algorithm","PeriodicalId":248766,"journal":{"name":"2005 IEEE 16th International Symposium on Personal, Indoor and Mobile Radio Communications","volume":"98 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133798747","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

Experimental investigation of undersampling for adjacent channel interference cancellation scheme 邻信道干扰消除方案的欠采样实验研究

2005 IEEE 16th International Symposium on Personal, Indoor and Mobile Radio Communications Pub Date : 2005-12-01 DOI: 10.1093/ietcom/e89-b.9.2548

A. Bostamam, Y. Sanada

引用次数: 5

OVSF code allocation and two-stage combining method to reduce inter-code interference in OFCDM system OFCDM系统中OVSF码分配和两阶段合并方法减少码间干扰

2005 IEEE 16th International Symposium on Personal, Indoor and Mobile Radio Communications Pub Date : 2005-12-01 DOI: 10.1109/PIMRC.2005.1651893

K. Hasegawa, R. Shimura, T. Ohno, N. Yoshimochi, I. Sasase

{"title":"OVSF code allocation and two-stage combining method to reduce inter-code interference in OFCDM system","authors":"K. Hasegawa, R. Shimura, T. Ohno, N. Yoshimochi, I. Sasase","doi":"10.1109/PIMRC.2005.1651893","DOIUrl":"https://doi.org/10.1109/PIMRC.2005.1651893","url":null,"abstract":"In this paper, we propose an OVSF code allocation at a base station and a two-stage combining method at a receiver to reduce inter-code interference in OFCDM system. In the proposed OVSF code allocation, OVSF codes which have different ancestor codes are allocated to users. If allocated codes are divided into chips shorter than spreading factor, chips which are produced by each allocated codes are orthogonal. In the two-stage combining method, the allocated code is divided into chips and received symbols are despread using chips. Demodulated symbols are produced from the despreading, multiplied by weights, and combined. The combining method of the proposed scheme has two stages. The first stage is the despreading, and the second stage is the weight combining. The proposed scheme uses few sub-carriers among which a difference of amplitude levels is small at the despreading, and combines demodulated symbols at the weight combining using suitable weights. Thus, the proposed scheme can reduce inter-code interference. We show that the proposed scheme achieves better BER performance than the conventional scheme by computer simulations","PeriodicalId":248766,"journal":{"name":"2005 IEEE 16th International Symposium on Personal, Indoor and Mobile Radio Communications","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128238755","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: 9

Distributed Intercellular Interference Management in 4THGeneration TDMA TDD Cellular Mobile Wireless Communications 第4代TDMA TDD蜂窝移动无线通信中的分布式蜂窝间干扰管理

2005 IEEE 16th International Symposium on Personal, Indoor and Mobile Radio Communications Pub Date : 2005-11-01 DOI: 10.1109/PIMRC.2005.1651711

P. Omiyi, H. Haas

引用次数: 1

Performance analysis for hybrid wireless networks 混合无线网络的性能分析

2005 IEEE 16th International Symposium on Personal, Indoor and Mobile Radio Communications Pub Date : 2005-11-01 DOI: 10.1109/PIMRC.2005.1651741

H. Venkataraman, H. Haas, Yeonwoo Lee, Sangboh Yun, S. Mclaughlin

引用次数: 18

Further Steps Towards the Development of a Hardware Simulator for MIMO Radio Channels MIMO无线电信道硬件模拟器的进一步发展

2005 IEEE 16th International Symposium on Personal, Indoor and Mobile Radio Communications Pub Date : 2005-09-12 DOI: 10.1109/PIMRC.2005.1651498

S. Picol, G. Zaharia, G. E. Zein

引用次数: 2