Pub Date : 1990-05-06DOI: 10.1109/VETEC.1990.110296
T. Komazaki, K. Gunji
The mobile terminal duplexer consists primarily of transmitting/receiving filters and a branching circuit. The filter consists primarily of a semicoaxial resonator, which is made of material of a high dielectric constant for compact components. A dielectric filter with attenuation pole and a novel branching circuit which have been developed by OKI for compactness and higher performance are introduced. The attenuation pole is implemented by connecting an additional circuit based on a capacitive-coupled bandpass filter. Three circuits are discussed: a circuit comprised of three-resonators with an attenuation pole on each of the lower and higher frequency sides of the passband, exhibiting symmetrical characteristics; a circuit with an attenuation pole only on the higher frequency side of the passband; and a circuit with an attenuation pole only on the lower frequency side of the passband. The filter features compactness (25% smaller, as compared with older models), and small insertion loss.<>
{"title":"Attenuation pole type dielectric filter for duplexer","authors":"T. Komazaki, K. Gunji","doi":"10.1109/VETEC.1990.110296","DOIUrl":"https://doi.org/10.1109/VETEC.1990.110296","url":null,"abstract":"The mobile terminal duplexer consists primarily of transmitting/receiving filters and a branching circuit. The filter consists primarily of a semicoaxial resonator, which is made of material of a high dielectric constant for compact components. A dielectric filter with attenuation pole and a novel branching circuit which have been developed by OKI for compactness and higher performance are introduced. The attenuation pole is implemented by connecting an additional circuit based on a capacitive-coupled bandpass filter. Three circuits are discussed: a circuit comprised of three-resonators with an attenuation pole on each of the lower and higher frequency sides of the passband, exhibiting symmetrical characteristics; a circuit with an attenuation pole only on the higher frequency side of the passband; and a circuit with an attenuation pole only on the lower frequency side of the passband. The filter features compactness (25% smaller, as compared with older models), and small insertion loss.<<ETX>>","PeriodicalId":366352,"journal":{"name":"40th IEEE Conference on Vehicular Technology","volume":"65 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126161950","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}
Pub Date : 1990-05-06DOI: 10.1109/VETEC.1990.110290
R. J. Jakubowski
The design concepts and applications of an EIA type-IV cellular repeater being offered by the Antenna Specialists Company are described. As large metropolitan systems mature, customers expect coverage further and further out into the suburbs. Rural systems under development, on the other hand, may project only enough subscribers to justify a single cell site. Both of these systems would benefit from a booster that would significantly extend coverage, but cost only a fraction of the amount of a conventional cell site. The Extend-A-Cell IV high power repeater system has been designed with these applications in mind. The high-power, frequency-translating cellular repeater is designed to significantly extend the coverage range of a cell site. This repeater is frequency-agile and translating, completely remote controlled, and unlike earlier boosters that required donor-cell sectorization requires no system modifications.<>
介绍了天线专家公司提供的EIA型蜂窝中继器的设计概念和应用。随着大型城市系统的成熟，客户希望覆盖范围越来越远，一直延伸到郊区。另一方面，正在发展的农村系统可能只需要足够的用户来建立一个单独的蜂窝基站。这两种系统都将受益于一个可以显著扩大覆盖范围的助推器，但成本仅为传统蜂窝站点的一小部分。extended - a - cell IV高功率中继器系统在设计时就考虑到了这些应用。高功率、频率转换蜂窝中继器设计用于显著扩展蜂窝站点的覆盖范围。该中继器频率灵活，可转换，完全远程控制，与早期需要供体细胞分割的助推器不同，无需系统修改。
{"title":"A new generation of high-power cellular repeaters","authors":"R. J. Jakubowski","doi":"10.1109/VETEC.1990.110290","DOIUrl":"https://doi.org/10.1109/VETEC.1990.110290","url":null,"abstract":"The design concepts and applications of an EIA type-IV cellular repeater being offered by the Antenna Specialists Company are described. As large metropolitan systems mature, customers expect coverage further and further out into the suburbs. Rural systems under development, on the other hand, may project only enough subscribers to justify a single cell site. Both of these systems would benefit from a booster that would significantly extend coverage, but cost only a fraction of the amount of a conventional cell site. The Extend-A-Cell IV high power repeater system has been designed with these applications in mind. The high-power, frequency-translating cellular repeater is designed to significantly extend the coverage range of a cell site. This repeater is frequency-agile and translating, completely remote controlled, and unlike earlier boosters that required donor-cell sectorization requires no system modifications.<<ETX>>","PeriodicalId":366352,"journal":{"name":"40th IEEE Conference on Vehicular Technology","volume":"64 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126389432","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}
Pub Date : 1990-05-06DOI: 10.1109/VETEC.1990.110349
Y. Yamauchi
Point-to-multipoint (multicast) packet radio data transmission protocols over the erroneous vehicular communication environment are studied. In order to improve the reliability of the transmission, the ARQ (automatic repeat request) scheme is introduced onto the multicast packet data transmission, and several retransmission methods are compared. In the usual point-to-point ARQ schemes, response from the listener is either ACK or NAK. Thus, the listener responds with a reply frame regardless of whether the I-frame from the talker was received successfully. but in some cases, one of the ACK and the NAK responses is not necessary because the other has the opposite meaning. The approach is based on this point of view. The NAK is chosen for the response to the I-frame, so that if the I-frame is received successfully, then the listener issues no response to it. The method is called NAK only ARQ. The NAK only ARQ scheme has superior throughput characteristics in spite of its simplicity. Simulated performance comparisons are presented.<>
{"title":"Reliable multicast over the mobile packet radio channel","authors":"Y. Yamauchi","doi":"10.1109/VETEC.1990.110349","DOIUrl":"https://doi.org/10.1109/VETEC.1990.110349","url":null,"abstract":"Point-to-multipoint (multicast) packet radio data transmission protocols over the erroneous vehicular communication environment are studied. In order to improve the reliability of the transmission, the ARQ (automatic repeat request) scheme is introduced onto the multicast packet data transmission, and several retransmission methods are compared. In the usual point-to-point ARQ schemes, response from the listener is either ACK or NAK. Thus, the listener responds with a reply frame regardless of whether the I-frame from the talker was received successfully. but in some cases, one of the ACK and the NAK responses is not necessary because the other has the opposite meaning. The approach is based on this point of view. The NAK is chosen for the response to the I-frame, so that if the I-frame is received successfully, then the listener issues no response to it. The method is called NAK only ARQ. The NAK only ARQ scheme has superior throughput characteristics in spite of its simplicity. Simulated performance comparisons are presented.<<ETX>>","PeriodicalId":366352,"journal":{"name":"40th IEEE Conference on Vehicular Technology","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127484254","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}
Pub Date : 1990-05-06DOI: 10.1109/VETEC.1990.110341
D. Lin, S. D. Kurtz, B. McCarthy
The development of an integrated data-compression system for speech and voiceband modem signals is described. The integrated source coder performs a quadrature decomposition of a bauded signal prior to quantization. A detection algorithm is used to determine the presence and the carrier frequency of the bauded signal. The coder is currently implemented with a TMS 32020 digital signal processor in a basic exchange radio system to provide wireless digital access for rural subscribers. Performance of the integrated source coder was evaluated in the lab and in a field trial. Using a radio link in the lab, the coder support the following data communication standards: 300 b/s Bell 103, CCITT V.21; 1200 b/s Bell 212A, CCITT V.22; 2400 b/s CCITT V.22 bis; and 2400 b/s CCITT V.24 ter. Tests were also conducted for the transmission of facsimiles between a dozen of the popular low-priced telecopiers. The reproduction quality of the system for various types of documents and drawings were near transparent.<>
介绍了一种用于语音和语音波段调制解调器信号的集成数据压缩系统的开发。集成的源编码器在量化之前对波特信号进行正交分解。一种检测算法被用来确定波特信号的存在和载波频率。编码器目前在基本交换无线电系统中使用TMS 32020数字信号处理器实现，为农村用户提供无线数字接入。在实验室和现场试验中对集成源代码编码器的性能进行了评估。采用实验室无线链路，编码器支持以下数据通信标准:300b /s Bell 103, CCITT V.21;1200 b/s Bell 212A, CCITT V.22;2400 b/s CCITT V.22 bis;和2400 b/s CCITT V.24 ter。还对十几种流行的低价复印机之间的传真传输进行了测试。该系统对各种类型的文件和图纸的复制质量接近透明。
{"title":"Data compression of voiceband modem signals","authors":"D. Lin, S. D. Kurtz, B. McCarthy","doi":"10.1109/VETEC.1990.110341","DOIUrl":"https://doi.org/10.1109/VETEC.1990.110341","url":null,"abstract":"The development of an integrated data-compression system for speech and voiceband modem signals is described. The integrated source coder performs a quadrature decomposition of a bauded signal prior to quantization. A detection algorithm is used to determine the presence and the carrier frequency of the bauded signal. The coder is currently implemented with a TMS 32020 digital signal processor in a basic exchange radio system to provide wireless digital access for rural subscribers. Performance of the integrated source coder was evaluated in the lab and in a field trial. Using a radio link in the lab, the coder support the following data communication standards: 300 b/s Bell 103, CCITT V.21; 1200 b/s Bell 212A, CCITT V.22; 2400 b/s CCITT V.22 bis; and 2400 b/s CCITT V.24 ter. Tests were also conducted for the transmission of facsimiles between a dozen of the popular low-priced telecopiers. The reproduction quality of the system for various types of documents and drawings were near transparent.<<ETX>>","PeriodicalId":366352,"journal":{"name":"40th IEEE Conference on Vehicular Technology","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126551385","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}
Pub Date : 1990-05-06DOI: 10.1109/VETEC.1990.110412
J. Yang, K. Feher
A digital pilot-symbol-aided Rayleigh fade compensation technique for coherent intersymbol interference-jitter-free offset quadrature phase shift keying (IJF-OQPSK) is proposed. Instead of a fixed valued pilot symbol sequence, a scrambled pilot symbol sequence is transmitted to measure, and therefore to compensate for, the Rayleigh fading channel. The bit error rate (BER) performance of this system is investigated in fast Rayleigh fading, additive white Gaussian noise (AWGN), and cochannel interference (CCI) environments by using computer simulation. The simulated results show that a 2.5 dB improvement is achieved over the differentially detected pi /4-DQPSK at a BER of 10/sup -3/. Unlike the differentially detected pi /4-DQPSK, the system does not have an error floor or residual bit error, provided that the frame length N is not longer than the upper limit of frame length, N/sub max/. Another significant advantage is that the proposed IJF-OQPSK modulated signal is shown to suffer less spectral spreading than pi /4-QPSK signaling over a nonlinearly amplified channel.<>
{"title":"A digital Rayleigh fade compensation technique for coherent IJF-OQPSK systems","authors":"J. Yang, K. Feher","doi":"10.1109/VETEC.1990.110412","DOIUrl":"https://doi.org/10.1109/VETEC.1990.110412","url":null,"abstract":"A digital pilot-symbol-aided Rayleigh fade compensation technique for coherent intersymbol interference-jitter-free offset quadrature phase shift keying (IJF-OQPSK) is proposed. Instead of a fixed valued pilot symbol sequence, a scrambled pilot symbol sequence is transmitted to measure, and therefore to compensate for, the Rayleigh fading channel. The bit error rate (BER) performance of this system is investigated in fast Rayleigh fading, additive white Gaussian noise (AWGN), and cochannel interference (CCI) environments by using computer simulation. The simulated results show that a 2.5 dB improvement is achieved over the differentially detected pi /4-DQPSK at a BER of 10/sup -3/. Unlike the differentially detected pi /4-DQPSK, the system does not have an error floor or residual bit error, provided that the frame length N is not longer than the upper limit of frame length, N/sub max/. Another significant advantage is that the proposed IJF-OQPSK modulated signal is shown to suffer less spectral spreading than pi /4-QPSK signaling over a nonlinearly amplified channel.<<ETX>>","PeriodicalId":366352,"journal":{"name":"40th IEEE Conference on Vehicular Technology","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127825972","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}
Pub Date : 1990-05-06DOI: 10.1109/VETEC.1990.110317
M. Kawano, T. Iwahashi, K. Mitsui, Y. Ozu
The premises cordless telephone (PCT) system provides a full function access to PSTN (public switched telephone network) subscriber lines via an existing PBX (private branch exchange) and/or a single controller or a network of controllers. The system enhances corporate communications by giving callers direct dial-through access to executives on the move and engineers and technicians working out of reach of wired telephones. The system offers similar benefits for offices, hotels, hospitals, building maintenance services, department stores, shopping malls, trade fairs, etc. Base stations configure the microcell structures with location registration and handoff features which will enable system planners to tailor the system economically to the diverse needs of traffic density and to eliminate the shadowing effects of building structures, walls, etc. The system features are described, including uses of the dynamic frequency assignment and flexible base station arrangement (irregularly located) within a microcell (or picocell) structure to ensure user-friendly operations, full extension of system flexibility, and significant increase in the traffic capacity within a highly dense traffic area.<>
{"title":"Design features of a premises cordless telephone system","authors":"M. Kawano, T. Iwahashi, K. Mitsui, Y. Ozu","doi":"10.1109/VETEC.1990.110317","DOIUrl":"https://doi.org/10.1109/VETEC.1990.110317","url":null,"abstract":"The premises cordless telephone (PCT) system provides a full function access to PSTN (public switched telephone network) subscriber lines via an existing PBX (private branch exchange) and/or a single controller or a network of controllers. The system enhances corporate communications by giving callers direct dial-through access to executives on the move and engineers and technicians working out of reach of wired telephones. The system offers similar benefits for offices, hotels, hospitals, building maintenance services, department stores, shopping malls, trade fairs, etc. Base stations configure the microcell structures with location registration and handoff features which will enable system planners to tailor the system economically to the diverse needs of traffic density and to eliminate the shadowing effects of building structures, walls, etc. The system features are described, including uses of the dynamic frequency assignment and flexible base station arrangement (irregularly located) within a microcell (or picocell) structure to ensure user-friendly operations, full extension of system flexibility, and significant increase in the traffic capacity within a highly dense traffic area.<<ETX>>","PeriodicalId":366352,"journal":{"name":"40th IEEE Conference on Vehicular Technology","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127818555","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}
Pub Date : 1990-05-06DOI: 10.1109/VETEC.1990.110400
K. J. Guth, T. Ha
Automatic repeat request (ARQ) techniques are often used by a packet-switching data communication network to provide an error-free communications link between stations. In an effort to improve the throughput on a short-range, RF, packet-switching data communications network, an adaptive ARQ strategy applied to stop-and-wait (SW) protocols was developed. To provide a system designer with flexibility, different adaptive strategies for different systems and link conditions were developed. Examples of information transfer between two stations using the adaptive SW protocol are presented. A simulation to compute the throughput efficiency of several adaptive SW protocols was performed. A comparison of the throughput efficiencies of the simulated adaptive SW protocol with the nonadaptive SW protocol showed good gains could be achieved using the adaptive strategy when the networks are subject to high channel bit error rates.<>
{"title":"An adaptive stop-and-wait ARQ strategy for mobile data communications","authors":"K. J. Guth, T. Ha","doi":"10.1109/VETEC.1990.110400","DOIUrl":"https://doi.org/10.1109/VETEC.1990.110400","url":null,"abstract":"Automatic repeat request (ARQ) techniques are often used by a packet-switching data communication network to provide an error-free communications link between stations. In an effort to improve the throughput on a short-range, RF, packet-switching data communications network, an adaptive ARQ strategy applied to stop-and-wait (SW) protocols was developed. To provide a system designer with flexibility, different adaptive strategies for different systems and link conditions were developed. Examples of information transfer between two stations using the adaptive SW protocol are presented. A simulation to compute the throughput efficiency of several adaptive SW protocols was performed. A comparison of the throughput efficiencies of the simulated adaptive SW protocol with the nonadaptive SW protocol showed good gains could be achieved using the adaptive strategy when the networks are subject to high channel bit error rates.<<ETX>>","PeriodicalId":366352,"journal":{"name":"40th IEEE Conference on Vehicular Technology","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133060302","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}
Pub Date : 1990-05-06DOI: 10.1109/VETEC.1990.110387
A. Turkmani, A. de Toledo
A software investigation was undertaken to assess the performance of signal transmissions over a Rayleigh fading mobile radio channel, and to compare the effective utilization of the channel by other time diversity techniques. It involved the simulation of a communication system using Manchester-encoded data with a bit rate of 8 kb/s, phase shift keying (PSK) modulation, and ideal coherent demodulation. The diversity techniques investigated are voting, selection, and combining with different signal strength weighting factors. Results show that postdetection linear combining (unity weighting factor) yields the maximum diversity improvement. It is shown that an improvement in the bit error rate (BER) performance is possible without increasing the number of repeated words.<>
{"title":"Time diversity for digital mobile radio","authors":"A. Turkmani, A. de Toledo","doi":"10.1109/VETEC.1990.110387","DOIUrl":"https://doi.org/10.1109/VETEC.1990.110387","url":null,"abstract":"A software investigation was undertaken to assess the performance of signal transmissions over a Rayleigh fading mobile radio channel, and to compare the effective utilization of the channel by other time diversity techniques. It involved the simulation of a communication system using Manchester-encoded data with a bit rate of 8 kb/s, phase shift keying (PSK) modulation, and ideal coherent demodulation. The diversity techniques investigated are voting, selection, and combining with different signal strength weighting factors. Results show that postdetection linear combining (unity weighting factor) yields the maximum diversity improvement. It is shown that an improvement in the bit error rate (BER) performance is possible without increasing the number of repeated words.<<ETX>>","PeriodicalId":366352,"journal":{"name":"40th IEEE Conference on Vehicular Technology","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128485157","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}
Pub Date : 1990-05-06DOI: 10.1109/VETEC.1990.110375
L. Carter, T. Maclean
A novel expression for the attenuation of a radio wave propagating over a mixed land-sea path successfully predicts the recovery of field strength over the sea path. An initial series of measurements has been made in the Auckland area to determine whether the recovery effect is a significant factor at cellular radio frequencies. The results presented are limited by the fact that they were taken in a real environment, rather than in controlled laboratory conditions. It is therefore difficult to eliminate unwanted variables, particularly the effects of clutter. Nevertheless, the results do show consistently that signal enhancement occurs over a sea-water path at cellular radio frequencies.<>
{"title":"Recovery effect in cellular radio systems","authors":"L. Carter, T. Maclean","doi":"10.1109/VETEC.1990.110375","DOIUrl":"https://doi.org/10.1109/VETEC.1990.110375","url":null,"abstract":"A novel expression for the attenuation of a radio wave propagating over a mixed land-sea path successfully predicts the recovery of field strength over the sea path. An initial series of measurements has been made in the Auckland area to determine whether the recovery effect is a significant factor at cellular radio frequencies. The results presented are limited by the fact that they were taken in a real environment, rather than in controlled laboratory conditions. It is therefore difficult to eliminate unwanted variables, particularly the effects of clutter. Nevertheless, the results do show consistently that signal enhancement occurs over a sea-water path at cellular radio frequencies.<<ETX>>","PeriodicalId":366352,"journal":{"name":"40th IEEE Conference on Vehicular Technology","volume":"1 2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116828796","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}
Pub Date : 1990-05-06DOI: 10.1109/VETEC.1990.110368
G. Femenias, R. Agustí
The performance of 64 kbit/s two-branch switched-diversity 4DPSK (differential phase shift keying) and TCM-8DPSK systems in the presence of a simulated Rayleigh fading channel are analyzed. The bit error rate (BER) is obtained as a function of switching threshold, maximum Doppler shift frequency of the channel, and interleaving buffer size. The optimum switching threshold is determined as a function of the other parameters. It is found that the location of the optimum switching threshold is nearly constant for different interleaving buffer sizes, and practically unaffected by the Doppler frequency. Using the optimum threshold, the BER-performance of the systems is determined with Doppler frequency and interleaving buffer size as parameters. One of the most significant results is that the switched-diversity trellis-coded modulation (TCM) 8DPSK system improves the switched-diversity 4DPSK performance by more than 8 dB for a BER >
{"title":"Switched-diversity trellis-coded 8-DPSK for mobile radio applications","authors":"G. Femenias, R. Agustí","doi":"10.1109/VETEC.1990.110368","DOIUrl":"https://doi.org/10.1109/VETEC.1990.110368","url":null,"abstract":"The performance of 64 kbit/s two-branch switched-diversity 4DPSK (differential phase shift keying) and TCM-8DPSK systems in the presence of a simulated Rayleigh fading channel are analyzed. The bit error rate (BER) is obtained as a function of switching threshold, maximum Doppler shift frequency of the channel, and interleaving buffer size. The optimum switching threshold is determined as a function of the other parameters. It is found that the location of the optimum switching threshold is nearly constant for different interleaving buffer sizes, and practically unaffected by the Doppler frequency. Using the optimum threshold, the BER-performance of the systems is determined with Doppler frequency and interleaving buffer size as parameters. One of the most significant results is that the switched-diversity trellis-coded modulation (TCM) 8DPSK system improves the switched-diversity 4DPSK performance by more than 8 dB for a BER <or=10/sup -3/, a Doppler frequency of 5 Hz, and an interleaving buffer size of 20*5000 symbols.<<ETX>>","PeriodicalId":366352,"journal":{"name":"40th IEEE Conference on Vehicular Technology","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116951675","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}
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