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Proceedings of GLOBECOM 1995 Mini最新文献

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Performance of a reference symbol assisted multistage successive interference cancelling receiver in a multi-cell CDMA wireless system 多小区CDMA无线系统中参考符号辅助多级连续干扰消除接收机的性能
Proceedings of GLOBECOM 1995 Mini Pub Date : 1995-11-13 DOI: 10.1109/CTMC.1995.502950
A. Soong, W. Krzymień
{"title":"Performance of a reference symbol assisted multistage successive interference cancelling receiver in a multi-cell CDMA wireless system","authors":"A. Soong, W. Krzymień","doi":"10.1109/CTMC.1995.502950","DOIUrl":"https://doi.org/10.1109/CTMC.1995.502950","url":null,"abstract":"The performance of a coherent multistage successive interference cancelling receiver using reference symbol assisted channel estimation is investigated for the reverse link of a multi-cell CDMA system. The transmitted signal structure is designed to improve the accuracy of channel estimates in the presence of multi-user interference. The multi-cell results show that for hexagonal cell geometry with path loss exponent of 4 and without any forward error correction coding, the capacity of the system is between 1.5 and 2.5 times that of a comparable commercial system. Traffic capacities with other path loss laws and cell geometries have also been determined and they show substantial improvement. The results also demonstrate that insignificant gain can be expected when the number of interference cancellation stages is increased beyond two.","PeriodicalId":278133,"journal":{"name":"Proceedings of GLOBECOM 1995 Mini","volume":"84 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132022758","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
Open-loop tanlock carrier recovery structure for BPSK and its performance BPSK开环tanlock载波回收结构及其性能
Proceedings of GLOBECOM 1995 Mini Pub Date : 1995-11-13 DOI: 10.1109/CTMC.1995.502955
P. Kam
{"title":"Open-loop tanlock carrier recovery structure for BPSK and its performance","authors":"P. Kam","doi":"10.1109/CTMC.1995.502955","DOIUrl":"https://doi.org/10.1109/CTMC.1995.502955","url":null,"abstract":"The tanlock carrier recovery structure has been shown to be the low SNR approximation to the optimum ML carrier phase estimator for a carrier with linear data modulations such as MPSK. It has long been known to have better performance than a Costas' loop or a squarer/PLL for BPSK, because its tangent-function phase detector characteristic has an extended linear range compared to the sine-function phase detector characteristic of the latter loops. Its implementation in conventional closed-loop form, however, requires the use of a divider which suffers from the problem of output overflow when the input divisor signal becomes very small. We suggest here an open-loop implementation which does not require the use of a divider and a VCO. The operational and performance advantages of this open-loop implementation over the conventional closed-loop implementation are pointed out. Some sample BER results for a coherent receiver employing this open-loop tanlock carrier recovery system are obtained via computer simulations. The results show that the receiver achieves significant performance gains over differential detection.","PeriodicalId":278133,"journal":{"name":"Proceedings of GLOBECOM 1995 Mini","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129656797","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
Optimal predictive TX combining diversity in correlated fading for microcellular mobile radio applications 微蜂窝移动无线电应用中相关衰落中最优预测TX组合分集
Proceedings of GLOBECOM 1995 Mini Pub Date : 1995-11-13 DOI: 10.1109/CTMC.1995.502930
A. Wittneben
{"title":"Optimal predictive TX combining diversity in correlated fading for microcellular mobile radio applications","authors":"A. Wittneben","doi":"10.1109/CTMC.1995.502930","DOIUrl":"https://doi.org/10.1109/CTMC.1995.502930","url":null,"abstract":"Transmitter diversity uses several transmit antennas to improve the performance of digital transmission in a fading environment. In transmitter selection diversity the best transmit antenna is selected on the basis of estimates of the propagation conditions from each antenna to the single receive antenna. In time division duplex systems these estimates can be obtained by measuring the received signal at each antenna in the receive time slots, which precede the transmit time slot. It has been proposed to use a predictor to improve the performance for a moving receiver (predictive TX selection diversity). No analysis is available in correlated fading. We consider predictive transmitter combining diversity in contrast to selection diversity this scheme uses all transmit antennas simultaneously. Our main contribution is a derivation and an analysis of the optimal predictive TX combining diversity algorithm in correlated fading. We derive exact closed form expressions for the average probability of error for two suboptimal combining methods and tight bounds on the performance of the optimal combining method. Quantitative results on the average bit error rate and the diversity gain are given for a system with DECT parameters.","PeriodicalId":278133,"journal":{"name":"Proceedings of GLOBECOM 1995 Mini","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127785451","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: 20
Coding and modulation for simultaneous voice and data transmission 同时语音和数据传输的编码和调制
Proceedings of GLOBECOM 1995 Mini Pub Date : 1995-11-13 DOI: 10.1109/CTMC.1995.502924
N. Seshadri, J. Kim
{"title":"Coding and modulation for simultaneous voice and data transmission","authors":"N. Seshadri, J. Kim","doi":"10.1109/CTMC.1995.502924","DOIUrl":"https://doi.org/10.1109/CTMC.1995.502924","url":null,"abstract":"Simultaneous voice and data (SVD) transmission over voiceband channels is an important step in realizing personal communication systems. Two of the techniques that have been proposed are (1) digital SVD (DSVD) where compressed speech is multiplexed with data, and (2) analog SVD (ASVD) where analog speech is superimposed on the data signal constellation. We evaluate the performance of an ASVD scheme. Data is transmitted as a PAM or a QAM signal with optional error protection and speech is superimposed on this constellation. We consider a number of techniques for decoding data as well as for recovering speech from the received signal. We also consider schemes which perform linear prediction at the transmitter and transmit the prediction residual instead of the speech. Informal listening tests reveal that excellent speech quality at data rates of up to 8000 bps can be achieved with acceptably low bit-error-rates.","PeriodicalId":278133,"journal":{"name":"Proceedings of GLOBECOM 1995 Mini","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128570028","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
Synthesis of low-crest waveforms for multicarrier CDMA system 多载波CDMA系统低波峰波形的合成
Proceedings of GLOBECOM 1995 Mini Pub Date : 1995-11-13 DOI: 10.1109/CTMC.1995.502946
T. Ho, V. Wei
{"title":"Synthesis of low-crest waveforms for multicarrier CDMA system","authors":"T. Ho, V. Wei","doi":"10.1109/CTMC.1995.502946","DOIUrl":"https://doi.org/10.1109/CTMC.1995.502946","url":null,"abstract":"The crest factor of a waveform is the ratio of its peak power to its average power. A low crest factor increases the efficiency of the transmitter power amplifier. We study the problem of synthesizing signals with low crest factor for multi-carrier code division multiple access (MC-CDMA) systems. By using Golay (1961) complementary sequences as spreading codes, the crest factor is upper bounded by 6 dB regardless of the length of the spreading code. In comparison, the crest factor of DS-SS-CDMA pulses with certain chip shapes can grow unbounded. We also present methods for constructing a large number of pulses to accommodate multiple-access users.","PeriodicalId":278133,"journal":{"name":"Proceedings of GLOBECOM 1995 Mini","volume":"96 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115286844","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: 13
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