2009 IEEE 20th International Symposium on Personal, Indoor and Mobile Radio Communications最新文献

BER analysis of uplink OFDMA in the presence of carrier frequency and timing offsets 存在载波频率和时间偏移时上行OFDMA的误码率分析

2009 IEEE 20th International Symposium on Personal, Indoor and Mobile Radio Communications Pub Date : 2010-05-23 DOI: 10.1109/ICC.2010.5502326

K. Raghunath, A. Chockalingam

引用次数: 4

Combining orthogonalized partial metrics: Efficient enumeration for soft-input sphere decoder 结合正交化部分度量:软输入球面解码器的高效枚举

2009 IEEE 20th International Symposium on Personal, Indoor and Mobile Radio Communications Pub Date : 2009-12-01 DOI: 10.1109/PIMRC.2009.5450104

Chun-Hao Liao, I-Wei Lai, K. Nikitopoulos, Filippo Borlenghi, D. Kammler, E. M. Witte, Dan Zhang, T. Chiueh, G. Ascheid, H. Meyr

引用次数: 24

Performance of turbo equalized double window cancellation and combining in large delay spread channels 大延迟扩频信道中turbo均衡双窗对消合并性能

2009 IEEE 20th International Symposium on Personal, Indoor and Mobile Radio Communications Pub Date : 2009-12-01 DOI: 10.1109/PIMRC.2009.5450286

Junhwan Lee, T. Ohtsuki, M. Nakagawa

{"title":"Performance of turbo equalized double window cancellation and combining in large delay spread channels","authors":"Junhwan Lee, T. Ohtsuki, M. Nakagawa","doi":"10.1109/PIMRC.2009.5450286","DOIUrl":"https://doi.org/10.1109/PIMRC.2009.5450286","url":null,"abstract":"In the orthogonal frequency division multiplexing (OFDM) the multipath exceeding a guard interval (GI) is one of obstacles for high data rate transmission. For the purpose of the interference suppression the authors have proposed the canceller algorithm naming DWCC, where the canceller operation is based on decision feedback equalization (DFE), but the performance of the canceller is still subject to the frequency selectivity since the tentative symbol detection at the deep faded subcarriers could not be reliable. In this paper turbo equalized double window cancellation and combining (TE-DWCC) is proposed. Throughout the paper, it is found that the error rate performance of TE-DWCC depends on how to incorporate the channel decoding gain from turbo equalization into DWCC. In addition, it is also shown that TE-DWCC is more compatible with the hard decision feedback (HDF) rather than the soft decision feedback (SDF) due to the ICI elimination method. Finally, by varying interference level, code rate, and decision feedback type, the performances of TE-DWCC are compared with the conventional canceller that adopts turbo equalization in the exponentially distributed slow fading channel.","PeriodicalId":110448,"journal":{"name":"2009 IEEE 20th International Symposium on Personal, Indoor and Mobile Radio Communications","volume":"171 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132829535","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

MMSE interference suppression in OFDM-antenna array with time shifted sampling ofdm天线阵时移采样抑制MMSE干扰

2009 IEEE 20th International Symposium on Personal, Indoor and Mobile Radio Communications Pub Date : 2009-12-01 DOI: 10.1109/PIMRC.2009.5450298

Hiroki Suzuki, Refik Caglar Kizilirmak, Y. Sanada

引用次数: 0

Initial LLR setting for belief propagation decoding with network coding 基于网络编码的信念传播译码的初始LLR设置

2009 IEEE 20th International Symposium on Personal, Indoor and Mobile Radio Communications Pub Date : 2009-12-01 DOI: 10.1109/PIMRC.2009.5449725

N. Tsuji, T. Ohtsuki

{"title":"Initial LLR setting for belief propagation decoding with network coding","authors":"N. Tsuji, T. Ohtsuki","doi":"10.1109/PIMRC.2009.5449725","DOIUrl":"https://doi.org/10.1109/PIMRC.2009.5449725","url":null,"abstract":"In recent years, network coding has been investigated as a way to improve throughput and power efficiency of wireless networks by mixing of various traffic flows. The scenario under consideration is a half-duplex decode-and-forward relay channel. The receiving stations decode the error-correcting-coded bits using Log-Likelihood Ratio (LLR). Here, it is important to set initial LLR to decode the coded data accurately. In this paper, we present how to set the initial LLR for belief propagation decoding with network coding to achieve better decoding error rate performance. We calculate initial LLR based not only on channels from relay station to receiving stations, but also on all channels from sending stations to receiving stations when stations decode error-correcting coded data. When we use turbo code or low-density parity-check (LDPC) code as error-correcting code, we decode the coded data accurately by the use of accurate initial LLR. We provide computer simulation results both under perfect and imperfect channel state information. We show that the proposed method improves bit error rate (BER) performance and that the proposed method decreases the number of decoding iterations.","PeriodicalId":110448,"journal":{"name":"2009 IEEE 20th International Symposium on Personal, Indoor and Mobile Radio Communications","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116860350","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

Moving target detection with MUSIC for the bistatic radar using digital broadcasting signals 采用数字广播信号的双基地雷达运动目标MUSIC探测

2009 IEEE 20th International Symposium on Personal, Indoor and Mobile Radio Communications Pub Date : 2009-12-01 DOI: 10.1109/PIMRC.2009.5449804

Junji Asada, I. Sasase

{"title":"Moving target detection with MUSIC for the bistatic radar using digital broadcasting signals","authors":"Junji Asada, I. Sasase","doi":"10.1109/PIMRC.2009.5449804","DOIUrl":"https://doi.org/10.1109/PIMRC.2009.5449804","url":null,"abstract":"In the bistatic radar using broadcasting signals, the delays between signals propagated directly and scattered by the target are measured to estimate the target position with cross-correlation. This results in the delay profile with the width limited by the bandwidth of the signal. To get better resolution, larger bandwidth is required, however, the bandwidth of broadcasting signals can not be increased by the receiver. In this paper, we propose a new method of the moving target detection with MU-SIC(MUltiple SIgnal Classification), processed at only receiver. That offers much narrower width than that of cross-correlation. The proposed method can distinguish the moving targets from the stationary targts, though the conventional MUSIC can not. This is realized by the decorrelation of the time delay-derived phase rotation factors caused by moving targets. The performances using ISDB-T(Integrated Service Digital Broadcasting -Terrestrial), the bandwidth of which is 5.57MHz, are evaluated by the computer simulations. The results show that two close moving targets, separated by 0.1μs, with SNR=−10dB each can be resolved even if the stationary target is located around the one moving target.","PeriodicalId":110448,"journal":{"name":"2009 IEEE 20th International Symposium on Personal, Indoor and Mobile Radio Communications","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131928847","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

On the outage behavior of cognitive relay assisted MIMO multiple access channel 认知中继辅助MIMO多址信道的中断行为研究

2009 IEEE 20th International Symposium on Personal, Indoor and Mobile Radio Communications Pub Date : 2009-12-01 DOI: 10.1109/PIMRC.2009.5449947

Md. Zahurul I. Sarkar, T. Ratnarajah, M. Sellathurai

{"title":"On the outage behavior of cognitive relay assisted MIMO multiple access channel","authors":"Md. Zahurul I. Sarkar, T. Ratnarajah, M. Sellathurai","doi":"10.1109/PIMRC.2009.5449947","DOIUrl":"https://doi.org/10.1109/PIMRC.2009.5449947","url":null,"abstract":"We consider a cognitive relay assisted multiple-input multiple-output (MIMO) communication scenario where multiple secondary users wish to communicate with the secondary receiver through Rayleigh fading channels in the presence of a primary user. We assume that secondary users transmits simultaneously with the primary user over the same channel instead of waiting for an idle channel which is traditional for a cognitive radio. We derive the expressions for mutual information received at the primary and secondary receivers in both the cases when cognitive relay is present or not. We also present the closed form expressions for the outage probabilities and complementary cumulative distribution functions (CCDFs) of mutual information received at the primary and secondary receivers in the absence of cognitive relay. Our results show that in the presence of cognitive relay, not only both the primary and multiple secondary users are able to communicate with intended receivers compensating interferences created at their receivers, but also the outage performance of primary and secondary users are improved due to the additional diversity obtained via cognitive relaying.","PeriodicalId":110448,"journal":{"name":"2009 IEEE 20th International Symposium on Personal, Indoor and Mobile Radio Communications","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133709725","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

On the optimal power allocation of a cognitive radio network 认知无线网络的最优功率分配

2009 IEEE 20th International Symposium on Personal, Indoor and Mobile Radio Communications Pub Date : 2009-12-01 DOI: 10.1109/PIMRC.2009.5450257

D. Shiung, Kwang-Cheng Chen

{"title":"On the optimal power allocation of a cognitive radio network","authors":"D. Shiung, Kwang-Cheng Chen","doi":"10.1109/PIMRC.2009.5450257","DOIUrl":"https://doi.org/10.1109/PIMRC.2009.5450257","url":null,"abstract":"It is well known that a cognitive radio network (CRN) may further enhance the sum spectral efficiency using temporarily idle spectrum. However, we usually ignore the spatial domain behaviors to fully utilize the radio resource to approach available system capacity. When a signal is transmitted, we usually treat its occupancy of spectrum along all propagation directions. However, up to certain range (distance), the signal strength is weak and possibly allow another co-existing transmission happening with a satisfactory signal to interference-and-noise ratio (SINR) at both transmit-receive (T-R) pairs. In this paper, we realize this concept for a CRN consisting of a primary (PR) T-R pair and a cognitive radio (CR) T-R pair; furthermore, we consider to what condition concurrent transmission can happen. We use the Lagrange multiplier method to determine the optimal power allocation scheme for such a CRN and then determine to what extent can the sum spectral efficiency be enhanced. It is found that the CR transmitter (CR-TX) may either transmit at its maximum allowable power or just turn off with no transmission power. Concurrent transmission of the PR T-R and CR T-R pairs with distance as a new dimension of multiplexing can be considered as a new version of CRN.","PeriodicalId":110448,"journal":{"name":"2009 IEEE 20th International Symposium on Personal, Indoor and Mobile Radio Communications","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116830226","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

Cognitive interference management in 3G femtocells 3G飞蜂窝的认知干扰管理

2009 IEEE 20th International Symposium on Personal, Indoor and Mobile Radio Communications Pub Date : 2009-12-01 DOI: 10.1109/PIMRC.2009.5450030

Yangyang Li, M. Macuha, E. Sousa, Takuro Sato, Masahiko Nanri

引用次数: 103

Channel occupancy-based user association in IEEE 802.11 wireless LANs IEEE 802.11无线局域网中基于信道占用的用户关联

2009 IEEE 20th International Symposium on Personal, Indoor and Mobile Radio Communications Pub Date : 2009-12-01 DOI: 10.1109/PIMRC.2009.5449783

Byunghyuk Jung, Wonjun Lee, Sangheon Pack, D. Du

{"title":"Channel occupancy-based user association in IEEE 802.11 wireless LANs","authors":"Byunghyuk Jung, Wonjun Lee, Sangheon Pack, D. Du","doi":"10.1109/PIMRC.2009.5449783","DOIUrl":"https://doi.org/10.1109/PIMRC.2009.5449783","url":null,"abstract":"It is usually possible to associate with more than one Access Point (AP) in IEEE 802.11 Wireless LANs. AP selection is a crucial issue because the performance achieved by a user heavily depends on the AP selected. A received signal strength (RSS)-based association mechanism is specified by the IEEE 802.11 standard. However, this does not consider the channel conditions and AP load, which leads to a low throughput and a low user transmission rate. An alternative to using the RSS is to exploit the airtime metric, which provides users with information on how busy the channel is, but the results of our simulations show that the airtime metric cannot indicate the exact status of the channel. In this paper, we present a new association framework using channel occupancy in order to provide users with exact channel status information of APs. Via the proposed scheme, users can compare the achievable throughput provided by each AP and select the best AP. We validate our proposed association method via simulation results, which show that the throughput improvement of the method is worthy of notice.","PeriodicalId":110448,"journal":{"name":"2009 IEEE 20th International Symposium on Personal, Indoor and Mobile Radio Communications","volume":"102 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116825145","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