IEEE International Symposium on Personal, Indoor and Mobile Radio Communications.最新文献

{"title":"The Effects Of Fading And Interference On The Performance Of Direct-Sequence Spread Spectrum Systems","authors":"A. Mohammed, A. Turkmani","doi":"10.1109/PIMRC.1991.571474","DOIUrl":"https://doi.org/10.1109/PIMRC.1991.571474","url":null,"abstract":"The effects of fading and interference on the performance of a Direct-Sequence Spread Spectrum Multiple Access system using Uiffcrcntial Phase Shift Keying modulation are investigated. The average bit error rate as a function of the signal-to-noise ratio is used as a performance measure for thc system. ‘The system error probability is evaluated using Gold codes of length L = 127 and operating under Rayleigh fading conditions. The system error rate is also investigated for the case of two intcrfcring signals and compared with the corresponding probabilities for no interference and/or no fading. ‘l‘he results show that the best performance occurs in thc absence of intcrfercnce and fading, while the worst performmce occurs when fading and interference are both present.","PeriodicalId":254396,"journal":{"name":"IEEE International Symposium on Personal, Indoor and Mobile Radio Communications.","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122915389","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}

{"title":"An Introduction To The Effect Of Data Modulation On Time-Shared Noncoherent Code Tracking Loop Operation","authors":"P. Kunnari, Pentti A. Leppänen","doi":"10.1109/PIMRC.1991.571489","DOIUrl":"https://doi.org/10.1109/PIMRC.1991.571489","url":null,"abstract":"The effect of data modulationoncodetracklng loop operation has been ignored inthebchnical literatwe upto now [1],[2]. This paper uses computer simulations to examine the effects of data modulation on the discriminator output of time sharednoncoherentdeby-lockedloopsThe~LshowhowdatamodulatiolFkrducedtransientsintherecehredslgnaldeaact from the performance of loops by forcing the discriminator IF filters Into a continuous transient state, even though dithering transients can be ignored. This may affect the performance of tau dither code tracking loops more severely than that of a double dither kop. Timeshared code tracking loop operation highlights the importance of proper selection of the code phase usedforspreadng data bits. OtheWse theexternal gain imbalance problem is merely replaced with an internal gain imbalance. Theetfect of data moddationcan be compensated for to a certain extent by choosing an m a t e COmMnationof spreading code~and~deby ,espec ia l ly i f thedu le l lng interval isequaltoosysymboltime.","PeriodicalId":254396,"journal":{"name":"IEEE International Symposium on Personal, Indoor and Mobile Radio Communications.","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126361322","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}

{"title":"Performance Of Parallel Combinatory Spread Spectrum Multiple Access Communication Systems","authors":"S. Sasaki, Jinkang Zhu, G. Marubayashi","doi":"10.1109/PIMRC.1991.571490","DOIUrl":"https://doi.org/10.1109/PIMRC.1991.571490","url":null,"abstract":"data 1 data 2 Abstract In this paper, several results of study for our newly proposed parallel combinatory spread spectrum communication system are presented. The proposed system can transmit 1.58N bits of information for a period of spreading sequence of length N in the maximum. For multiple access performance, more than 47% improvement of the spectral efficiency is achieved by the proposed system compared to conventional direct sequence spread spectrum system.","PeriodicalId":254396,"journal":{"name":"IEEE International Symposium on Personal, Indoor and Mobile Radio Communications.","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129111930","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}

{"title":"Statistical Data From Frequenq Domain Measurements Of Indoor PCN Communication Channel","authors":"L. Pickering, E. N. Barnhart, M. Witten","doi":"10.1109/PIMRC.1991.571470","DOIUrl":"https://doi.org/10.1109/PIMRC.1991.571470","url":null,"abstract":"","PeriodicalId":254396,"journal":{"name":"IEEE International Symposium on Personal, Indoor and Mobile Radio Communications.","volume":"131 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134263556","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}

{"title":"Microcellular Propagation Measurements In An Urban Environment","authors":"E. Green, M. Hata","doi":"10.1109/PIMRC.1991.571510","DOIUrl":"https://doi.org/10.1109/PIMRC.1991.571510","url":null,"abstract":"","PeriodicalId":254396,"journal":{"name":"IEEE International Symposium on Personal, Indoor and Mobile Radio Communications.","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129954889","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}

{"title":"Spectral Analysis Of RLL Codes Modulated By FSK Or CPM","authors":"Chang-jia Chen, Tai-yi Chen","doi":"10.1109/PIMRC.1991.571466","DOIUrl":"https://doi.org/10.1109/PIMRC.1991.571466","url":null,"abstract":"In this paper, the method developed in [l] is generalized to the spectral analysis of RLL codes modulated by FSK or CPM. It shows that by using the formulae given in this paper, the state size involved in the spectrum computation can be largely reduced compared with the traditional method, hence the burden in the spectrum calculation can be much released. I .Introduction I t is known that RLL codes are attractive at their spectral shaping and self clocking properties. Modulated RLL codes may be the candidates for mobile communications and satellite communications. Since the one step FSSM representation for the RLL codes involves a very large size of states [2], it makes the spectral analysis formidable by using the known method [3,4,5 361. As shown in [l], a run-length diagram can be associated with RLL codes. that will largely reduce the number of states involved in the representation of the structure of the codes. By then, the base band spectrum can be calculated by a much simple way as shown in [l]. In this paper, the method proposed in [l] is generalized to the modulated RLL codes. It shows that the spectrum calculation can be simplified for modulated RLL codes as well when the run-length diagram is adopted. II . RLL Codes Modulated By FSK or CPM A RLL code [7] is a set of binary sequences that satisfy the (d,k) constraint. Any 1 binary sequence, denoted by {c,] of finite or infinite length can be parsed uniquely into a concatenation of phrase, each phrase ending in a single \"I\" and beginning with a string of none or one or more \"OS\". A binary sequence is said to satisfy a (d,k) constraint if and only if all its phrase contain no less than (d+l) digits and no more than *+I) digits. Thus \"d\" refers to the minimum number of 0's in a phrase and \"k\" refers to the maximum number of 0's in a phrase. A (d,k) constraint RLL code can be generated by a finite state sequential machine (FSSM). And a directed graph, called run-length diagram can be used to represent the FSSM [l]. Each of the directed edge connecting state sj to si has alabel . Where pi,j and are the state transition probability and the phrase length in that state transition respectively. For each binary RLL sequence, there is a input signal process [A,], which takes value in { k I), associated with it. The input sequence [A,] satisfies that: A,= 1-2b,; b,= b,-@ c,. In other words, the input sequence has same pulse length as the length of phrases in the binary (d,k) sequence {c,], and has an alternating polarity. There are many ways to modulate a RLL code. By using BPSK to modulate the input sequence is the simplest one. Since only frequency shift is involved in the BPSK modulation, the spectrum of BPSK modulated input sequence is the same as the spectrum of baseband RLL code. Hence many results can be found in literature [1,6]1. In this paper, FSK modulated input signal process will be addressed. In this modulation scheme, different frequencies is assigned to different length of phrases. ","PeriodicalId":254396,"journal":{"name":"IEEE International Symposium on Personal, Indoor and Mobile Radio Communications.","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127001727","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}

{"title":"Performance Limitations Of The Indoor Radio Channel","authors":"G. Heidari-Bateni, C. McGillem","doi":"10.1109/PIMRC.1991.571469","DOIUrl":"https://doi.org/10.1109/PIMRC.1991.571469","url":null,"abstract":"","PeriodicalId":254396,"journal":{"name":"IEEE International Symposium on Personal, Indoor and Mobile Radio Communications.","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128647051","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}

{"title":"A Ray Launching Method For The Prediction Of Indoor Radio Channel Characteristics","authors":"M. Lawton, R. Davies, Joe McGeehan","doi":"10.1109/PIMRC.1991.571473","DOIUrl":"https://doi.org/10.1109/PIMRC.1991.571473","url":null,"abstract":"Presented here is an analytical method for the prediction of power delay profiles within a room environment. The model works directly on a 3-D description of a room. Provided here is a brief discussion of the model and a presentation of both measured and modelled results for delay spread values, which are shown to be in good agreement. The model’s output for narrowband signal strength values was found to be well represented by the usual theoretical distributions.","PeriodicalId":254396,"journal":{"name":"IEEE International Symposium on Personal, Indoor and Mobile Radio Communications.","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128856893","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}

{"title":"The Millicom/SCS Mobilecom PCN Field Test","authors":"D. Schilling, L. Milstein, R. Pickholtz, M. Kullback, W. Biederman","doi":"10.1109/PIMRC.1991.571515","DOIUrl":"https://doi.org/10.1109/PIMRC.1991.571515","url":null,"abstract":"Code Division Multiple Access (CDMA) is a digital multiple-access technique, whereby each signal has its own unique binary sequence, and all signals share the same spectrum. In the United States, personal communication networks using CDMA, will provide to each user, a separate code, which will change from cell-to-cell. We call this code reuse, just like the frequency reuse employed in the FDMA or TDMA systems. However, there are many more codes, than frequency bands.","PeriodicalId":254396,"journal":{"name":"IEEE International Symposium on Personal, Indoor and Mobile Radio Communications.","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125568102","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}

{"title":"Optimum Transmission Of The Narrow Band PSK For Mobile Radio Services","authors":"K. Wakai, Jinzhu Li, T. Komatsu, H. Ikeda","doi":"10.1109/PIMRC.1991.571483","DOIUrl":"https://doi.org/10.1109/PIMRC.1991.571483","url":null,"abstract":"The narrow band PSK system for the mobile radio having a small phase deviation angle has been proposed to suppress the spectrum energy spread over the transmission bandwidth. For the determination of the optimum transmission parameters in the narrow band PSK system, the transmission rate, number of phases, and phase deviation angles are changed. The bandwidth in the medium-wave frequency range must be kept within k7.5 kHz because the frequencies are allocated in 9 kHz spans. The experimental results provided the optimum parameters in the PSK system at medium frequencies. These were a transmission rate of 1,200 bps or 2,400 bps, a number of phases of 2<p or 45b , and a phase deviation angle of 90 degrees to 1 2 0 degrees. In the narrow band PSK system, the spectrum energy can be suppressed more than 10 dB compared to that in the BPSK or QPSK system. The narrow band PSK system can be used for mobile radio communications in the medium wave frequencies for facsimile and paging services.","PeriodicalId":254396,"journal":{"name":"IEEE International Symposium on Personal, Indoor and Mobile Radio Communications.","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115304739","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}