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Blind RBF equalizer for received signal constellation independent channel 接收信号星座无关信道盲RBF均衡器
The 8th International Conference on Communication Systems, 2002. ICCS 2002. Pub Date : 2002-11-25 DOI: 10.1109/ICCS.2002.1182442
Hai-Hsing Lin, K. Yamashita
{"title":"Blind RBF equalizer for received signal constellation independent channel","authors":"Hai-Hsing Lin, K. Yamashita","doi":"10.1109/ICCS.2002.1182442","DOIUrl":"https://doi.org/10.1109/ICCS.2002.1182442","url":null,"abstract":"The purpose of this paper is to propose a novel cluster map based blind RBF equalizer for received signal constellation (RSC) independent channel. Without the channel estimator, firstly, a neural-gas algorithm is used to obtain the desired number of unlabeled RBF centers. Then these unlabeled centers are partitioned into appropriate subsets based on a cluster map generated from the known RBF equalizer structure. This process, which also can be viewed as the weight initialization, is implemented merely by several simple sorting operations. Finally, the weight is adjusted iteratively by a unsupervised least mean square (LMS) algorithm. Because of the effective weight initialization that comply with the underlying structure of the RBF equalizer, the proposed blind RBF equalizer achieves almost identical performance with the optimal RBF equalizer. The validity of the proposed equalizer is also demonstrated by computer simulations.","PeriodicalId":401041,"journal":{"name":"The 8th International Conference on Communication Systems, 2002. ICCS 2002.","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124228044","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
Frequency jitter of a digital phase-locked loop and comparison with a modified CRB 数字锁相环的频率抖动及其与改进CRB的比较
The 8th International Conference on Communication Systems, 2002. ICCS 2002. Pub Date : 2002-11-25 DOI: 10.1109/ICCS.2002.1182445
S. Kandeepan, S. Reisenfeld
{"title":"Frequency jitter of a digital phase-locked loop and comparison with a modified CRB","authors":"S. Kandeepan, S. Reisenfeld","doi":"10.1109/ICCS.2002.1182445","DOIUrl":"https://doi.org/10.1109/ICCS.2002.1182445","url":null,"abstract":"The steady state (SS) noise performance of a digital phase locked loop (DPLL) is of very much interest, while tracking carrier signals. In the literature the SS performance is very well examined in terms of the SS phase jitter, however the SS frequency jitter of a DPLL is unexamined up to now. In this paper we analyse the SS performance of a DPLL in terms of the frequency jitter. We derive a linearised expression for the SS frequency jitter of a DPLL, and verify it by simulations.","PeriodicalId":401041,"journal":{"name":"The 8th International Conference on Communication Systems, 2002. ICCS 2002.","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116976939","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: 11
Hop selection in peer-to-peer WPAN networks 点对点WPAN网络中的跳数选择
The 8th International Conference on Communication Systems, 2002. ICCS 2002. Pub Date : 2002-11-25 DOI: 10.1109/ICCS.2002.1183255
Leong Wai Yie, J. Homer
{"title":"Hop selection in peer-to-peer WPAN networks","authors":"Leong Wai Yie, J. Homer","doi":"10.1109/ICCS.2002.1183255","DOIUrl":"https://doi.org/10.1109/ICCS.2002.1183255","url":null,"abstract":"Currently, wireless technology is revolutionizing the way we share information and communicate. The demands for mobility have made wireless technology the primary source for voice communication. Code-division multiple-access (CDMA) is a very popular spread spectrum application due to its claims of low transmission power, higher system capacity, ability to mitigate multipath fading and user interference. In that case, frequency-hopping code-division multiple access (FH-CDMA) has received considerable attention over the past few years. This technique will allow a better performance over a fading channel, message privacy, and immunity to narrowband interference. This paper addresses the characteristics of FH-CDMA in WPAN networks, with an emphasis on frequency-hopped Bluetooth systems. A performance evaluation of FH-CDMA is discussed and simulated. The analysis shows the interaction between the designed parameters and their effect on the network system. Most specifically, the FH-CDMA scheme provides frequency and temporal diversity to combat the effects of interference.","PeriodicalId":401041,"journal":{"name":"The 8th International Conference on Communication Systems, 2002. ICCS 2002.","volume":"13 4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116409556","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
Efficient random access channel transmission method utilizing soft-combining of retransmitted message packets according to QoS 基于QoS的重传报文软合并的高效随机接入信道传输方法
The 8th International Conference on Communication Systems, 2002. ICCS 2002. Pub Date : 2002-11-25 DOI: 10.1109/ICCS.2002.1182513
Y. Lizuka, M. Tanno, M. Sawahashi
{"title":"Efficient random access channel transmission method utilizing soft-combining of retransmitted message packets according to QoS","authors":"Y. Lizuka, M. Tanno, M. Sawahashi","doi":"10.1109/ICCS.2002.1182513","DOIUrl":"https://doi.org/10.1109/ICCS.2002.1182513","url":null,"abstract":"This paper proposes an efficient random access channel (RACH) transmission method that utilizes soft-combining of consecutively retransmitted message data packets according to the quality of service (QoS) requirements for broadband multi-carrier/DS-CDMA (MC/DS-CDMA) in the reverse link. In the proposed scheme, the relative transmission power of message data compared to that of a successfully detected preamble for non-real time (NRT) traffic data is significantly reduced to achieve error-free transmission by soft-combining several retransmitted message data packets thanks to time diversity since the delay requirement is relaxed. Meanwhile, for real time (RT) traffic data with rigid delay requirements, the relative transmission power of the message data compared to that of the detected preamble is increased to reduce the residual packet error rate with a limited number of retransmissions. Simulation results elucidate that the total required average received signal energy per bit-to-background noise power spectrum density ratio (E/sub b//N/sub 0/) for error-free transmission with time diversity for NRT traffic data is reduced by approximately 2.4 dB compared to that for RT traffic data in a 12-path fading channel with exponential distribution at the fading maximum Doppler frequency of f/sub D/ = 20 Hz.","PeriodicalId":401041,"journal":{"name":"The 8th International Conference on Communication Systems, 2002. ICCS 2002.","volume":"152 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123645594","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 note on polynomial complexity optimal multiuser detection for certain non-orthogonal CDMA signals 若干非正交CDMA信号的多项式复杂度最优多用户检测
The 8th International Conference on Communication Systems, 2002. ICCS 2002. Pub Date : 2002-11-25 DOI: 10.1109/ICCS.2002.1183261
Tan Bien Aik, M. Motani, LimTeng Joon
{"title":"A note on polynomial complexity optimal multiuser detection for certain non-orthogonal CDMA signals","authors":"Tan Bien Aik, M. Motani, LimTeng Joon","doi":"10.1109/ICCS.2002.1183261","DOIUrl":"https://doi.org/10.1109/ICCS.2002.1183261","url":null,"abstract":"It is well known that jointly-optimum multiuser detection (MUD) in code division multiple access (CDMA) systems has a computational complexity that increases exponentially with the number of users. If the signal cross-correlations between different users are non-positive, then optimum MUD can be done with polynomial complexity using graph theory. The MUD problem is transformed into one that solves for the minimum cut (min-cut) or maximum flow (max-flow) in an associated graph or network. An alternative method to transform the MUD problem into a network, that sees a reduction in the number of edges by 50 percent, is proposed. This results in minimizing the already polynomial-complexity of existing multiuser detection techniques based on edge-dependent max-flow algorithms.","PeriodicalId":401041,"journal":{"name":"The 8th International Conference on Communication Systems, 2002. ICCS 2002.","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123919914","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
Quality of service renegotiation effect on ATM network performance 业务质量重协商对ATM网络性能的影响
The 8th International Conference on Communication Systems, 2002. ICCS 2002. Pub Date : 2002-11-25 DOI: 10.1109/ICCS.2002.1182454
M. Ashibani, D. Mashao, B. Nleya
{"title":"Quality of service renegotiation effect on ATM network performance","authors":"M. Ashibani, D. Mashao, B. Nleya","doi":"10.1109/ICCS.2002.1182454","DOIUrl":"https://doi.org/10.1109/ICCS.2002.1182454","url":null,"abstract":"The bandwidth requirements for variable bit rate (VBR) traffic such as compressed video shows a dramatic variation over different time intervals. Allocating a bandwidth at the peak bit rate for the entire call duration will guarantee the quality of service (QoS) but this result in poor network resources utilization. We have proposed an alternative approach that renegotiates the allocated bandwidth and QoS during the lifetime of the connection. We present the results of a performance evaluation for the proposed renegotiation-based dynamic bandwidth allocation scheme. In particular, we determine the impact of the renegotiation frequency on the network performance.","PeriodicalId":401041,"journal":{"name":"The 8th International Conference on Communication Systems, 2002. ICCS 2002.","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124999337","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
Bandwidth-efficient packet transmission algorithm for Bluetooth scatternets 蓝牙散射网的带宽高效分组传输算法
The 8th International Conference on Communication Systems, 2002. ICCS 2002. Pub Date : 2002-11-25 DOI: 10.1109/ICCS.2002.1183245
Shoie-Chyr Lin, H. Chu, Yu-Yen Chung
{"title":"Bandwidth-efficient packet transmission algorithm for Bluetooth scatternets","authors":"Shoie-Chyr Lin, H. Chu, Yu-Yen Chung","doi":"10.1109/ICCS.2002.1183245","DOIUrl":"https://doi.org/10.1109/ICCS.2002.1183245","url":null,"abstract":"An algorithm that uses part of the X.25 protocol for circuit switching has been developed for data packet transmission in Bluetooth scatternets. The goal of this algorithm is to minimize the overhead on the data packet from the usual routing-type algorithms, as well as to efficiently transmit data packets through a Bluetooth scatternet without the prior information about the configuration of a scatternet.","PeriodicalId":401041,"journal":{"name":"The 8th International Conference on Communication Systems, 2002. ICCS 2002.","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125024271","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
Resource allocation in the multimedia MC-CDMA system with residual effective bandwidth distribution 基于剩余有效带宽分配的多媒体MC-CDMA系统资源分配
The 8th International Conference on Communication Systems, 2002. ICCS 2002. Pub Date : 2002-11-25 DOI: 10.1109/ICCS.2002.1183305
S. Pan, T. Ng
{"title":"Resource allocation in the multimedia MC-CDMA system with residual effective bandwidth distribution","authors":"S. Pan, T. Ng","doi":"10.1109/ICCS.2002.1183305","DOIUrl":"https://doi.org/10.1109/ICCS.2002.1183305","url":null,"abstract":"In this paper, a combined power and rate control algorithm is proposed and evaluated for a multi-code DS-CDMA integrated service system. Different class of service is allocated with different power level to satisfy its energy to interference ratio requirement. Delay sensitive services are allowed to transmit with their burst rate and a residual effective bandwidth based algorithm is used to control the transmission rate of non-delay sensitive services. Simulation experiments are used to investigate the system performance and show that our resource allocation scheme results in less packet loss probability than the scheme which arbitrarily fixes the bit rate.","PeriodicalId":401041,"journal":{"name":"The 8th International Conference on Communication Systems, 2002. ICCS 2002.","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129797419","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 new synchronization algorithm for OFDM systems in multipath environment 多径环境下OFDM系统的一种新的同步算法
The 8th International Conference on Communication Systems, 2002. ICCS 2002. Pub Date : 2002-11-25 DOI: 10.1109/ICCS.2002.1182476
Liang Wang, X. Shan, Yong Ren
{"title":"A new synchronization algorithm for OFDM systems in multipath environment","authors":"Liang Wang, X. Shan, Yong Ren","doi":"10.1109/ICCS.2002.1182476","DOIUrl":"https://doi.org/10.1109/ICCS.2002.1182476","url":null,"abstract":"Carrier frequency and symbol timing errors may greatly degrade the performance of the orthogonal frequency division multiplexing (OFDM) system, especially in multipath environment. We explore the cyclostationarity of OFDM signals, which only relies on second order statistics, to estimate the synchronization offset. First, a coarse carrier frequency offset estimator for multipath environment is developed using the second order statistics of the received OFDM signal. It has a wide capture range though not accurate. Second, we introduce a new synchronization algorithm based on cyclostationarity and matched filter theories, which can get the maximal estimation SNR in multipath environment. Both estimators utilize channel state information to achieve better estimation performance and are non-pilot aided. They can be combined to form a whole OFDM synchronizer in multipath environment. Finally, simulations confirm the performance of the estimation algorithm.","PeriodicalId":401041,"journal":{"name":"The 8th International Conference on Communication Systems, 2002. ICCS 2002.","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128580493","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
Low power implementation of FFT/IFFT processor for IEEE 802.11a wireless LAN transceiver 用于IEEE 802.11a无线局域网收发器的FFT/IFFT处理器的低功耗实现
The 8th International Conference on Communication Systems, 2002. ICCS 2002. Pub Date : 2002-11-25 DOI: 10.1109/ICCS.2002.1182475
Doreen Yeo, Zhongjun Wang, B. Zhao, Yajuan He
{"title":"Low power implementation of FFT/IFFT processor for IEEE 802.11a wireless LAN transceiver","authors":"Doreen Yeo, Zhongjun Wang, B. Zhao, Yajuan He","doi":"10.1109/ICCS.2002.1182475","DOIUrl":"https://doi.org/10.1109/ICCS.2002.1182475","url":null,"abstract":"In an orthogonal frequency division multiplexing (OFDM) system, the fast Fourier transform (FFT) is one of the major processing blocks. The inverse FFT (IFFT) is used to modulate a serially transmitted signal into parallel orthogonal signals while demodulation is achieved by FFT at the receiver. With the limited battery life, energy efficiency is becoming crucial in the design of next generation wireless systems. Typically, power conservation is used in the hardware design of such systems. This paper presents an efficient scheme using reduced precision and wordlength optimization to reduce power and increase performance of FFT in the transmitter for IEEE 802.11a WLAN applications. With reduced input bits during transmission, simulation results show that the power consumption of the butterfly functional unit can be reduced considerably.","PeriodicalId":401041,"journal":{"name":"The 8th International Conference on Communication Systems, 2002. ICCS 2002.","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128588347","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
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