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1999 IEEE Communications Theory Mini-Conference (Cat. No.99EX352)最新文献

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Performance analysis of generalized selective combining over Rayleigh fading channels 瑞利衰落信道中广义选择性组合的性能分析
1999 IEEE Communications Theory Mini-Conference (Cat. No.99EX352) Pub Date : 1999-06-06 DOI: 10.1109/CTMC.1999.790247
Mohamed-Slim Alouini, M. Simon
{"title":"Performance analysis of generalized selective combining over Rayleigh fading channels","authors":"Mohamed-Slim Alouini, M. Simon","doi":"10.1109/CTMC.1999.790247","DOIUrl":"https://doi.org/10.1109/CTMC.1999.790247","url":null,"abstract":"A performance analysis of the generalized selective combining (GSC) diversity scheme over Rayleigh fading channels is presented and compared with that of the conventional maximal-ratio combining and selective combining schemes. Starting with the moment generating function of the GSC output signal-to-noise ratio (SNR) we derive closed-form expressions for the average combined SNR, outage probability, and average error probability of a wide variety of modulation schemes operating over independent identically distributed diversity paths. Because of their simple form, these expressions readily allow numerical evaluation for cases of practical interest.","PeriodicalId":395433,"journal":{"name":"1999 IEEE Communications Theory Mini-Conference (Cat. No.99EX352)","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116604675","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: 40
Reduced complexity trellis code transfer function computation 降低了网格代码传递函数计算的复杂度
1999 IEEE Communications Theory Mini-Conference (Cat. No.99EX352) Pub Date : 1999-06-06 DOI: 10.1109/CTMC.1999.790233
R. Wesel
{"title":"Reduced complexity trellis code transfer function computation","authors":"R. Wesel","doi":"10.1109/CTMC.1999.790233","DOIUrl":"https://doi.org/10.1109/CTMC.1999.790233","url":null,"abstract":"An appropriate transfer function T(W,I) allows computation of the distance spectra and union bounds on the bit error rate for 2/sup ve/-state trellis codes. Various state transition diagrams can yield the correct transfer function. Biglieri (1984) described a general algorithm using a 2/sup 2/spl nu/(e)/-state transition diagram. Rouanne and Costello (1989) and Zehavi and Wolf (1987) demonstrated that a 2/sup /spl nu/(e)/-state transition diagram is sufficient for quasi-regular codes. This paper computes the transfer function using a 2/sup /spl nu/(e)+/spl nu/(q)/-state transition diagram where /spl nu//sub q/ might be any integer between zero and /spl nu//sub e/. The particular value of /spl nu//sub q/ depends on the relationship between the constellation labeling and the convolutional encoder. For quasi-regular codes, /spl nu//sub q/=0 and the overall number of states is the same as with the technique of Rouanne et al. For codes that are not quasi-regular, the new technique often improves efficiency with /spl nu//sub q/","PeriodicalId":395433,"journal":{"name":"1999 IEEE Communications Theory Mini-Conference (Cat. No.99EX352)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114286060","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
Impact of spreading bandwidth on RAKE reception in dense multipath channels 密集多径信道中扩展带宽对RAKE接收的影响
1999 IEEE Communications Theory Mini-Conference (Cat. No.99EX352) Pub Date : 1999-06-06 DOI: 10.1109/CTMC.1999.790241
M. Win, Z. Kostic
{"title":"Impact of spreading bandwidth on RAKE reception in dense multipath channels","authors":"M. Win, Z. Kostic","doi":"10.1109/CTMC.1999.790241","DOIUrl":"https://doi.org/10.1109/CTMC.1999.790241","url":null,"abstract":"We develop an analytical framework to quantify the effects of spreading bandwidth on spread spectrum (SS) systems operating in dense multipath environments. Closed form expressions for the mean and variance of the total RAKE receiver output signal-to-noise ratio (SNR) are derived. The proposed problem is made analytically tractable by transforming the physical RAKE paths into the virtual path domain.","PeriodicalId":395433,"journal":{"name":"1999 IEEE Communications Theory Mini-Conference (Cat. No.99EX352)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125721590","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: 73
Outage capacities of broadcast fading channels with channel side information under different spectrum-sharing techniques 不同频谱共享技术下含信道侧信息的广播衰落信道的中断容量
1999 IEEE Communications Theory Mini-Conference (Cat. No.99EX352) Pub Date : 1999-06-06 DOI: 10.1109/CTMC.1999.790231
Lifang Li, A. Goldsmith
{"title":"Outage capacities of broadcast fading channels with channel side information under different spectrum-sharing techniques","authors":"Lifang Li, A. Goldsmith","doi":"10.1109/CTMC.1999.790231","DOIUrl":"https://doi.org/10.1109/CTMC.1999.790231","url":null,"abstract":"We derive the outage capacity regions of fading broadcast channels for code-division (CD), time-division (TD) and frequency-division (FD), assuming that both the transmitter and the receivers have perfect channel side information. The zero-outage capacity regions and the associate optimal resource allocation policies are obtained for CD with and without successive decoding, for TD and for FD. We show that in an M-user broadcast system, the outage capacity region is implicitly obtained by deriving the outage probability region for a given rate vector. Given the required rate of each user, we find a strategy which bounds the outage probability region for different spectrum-sharing techniques. The corresponding optimal power allocation scheme is a multi-user generalization of the threshold-decision rule for a single-user fading channel. Also discussed is a simpler minimum common outage probability problem under the assumption that the broadcast channel is either not used at all when fading is severe or used simultaneously for all users. Numerical results for various outage capacity regions are obtained for the Nakagami-m fading model.","PeriodicalId":395433,"journal":{"name":"1999 IEEE Communications Theory Mini-Conference (Cat. No.99EX352)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116723602","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
Signal-design for bandwidth-efficient multiple access (BEMA) communication based on eigenvalue optimization 基于特征值优化的带宽高效多址(BEMA)通信信号设计
1999 IEEE Communications Theory Mini-Conference (Cat. No.99EX352) Pub Date : 1999-06-06 DOI: 10.1109/CTMC.1999.790256
T. Guess, M. Varanasi
{"title":"Signal-design for bandwidth-efficient multiple access (BEMA) communication based on eigenvalue optimization","authors":"T. Guess, M. Varanasi","doi":"10.1109/CTMC.1999.790256","DOIUrl":"https://doi.org/10.1109/CTMC.1999.790256","url":null,"abstract":"Bandwidth-efficient multiple access (BEMA) is a multiple-access technique that seeks to minimize the required bandwidth while guaranteeing a certain quality of service (QoS) for each user. Decision feedback receivers (DFR) are used at the base station that decode the users successively, thereby allowing the users to use single-user error-control codes. This paper proposes a transmitter waveform design for a DFR based on eigenvalue optimization. The methodology is applicable for bandwidth measures such as root-mean squared (RMS) and fractional out-of-band power (FOBP). Numerical results show that BMA can significantly outperform orthogonal- and identical waveform signaling schemes.","PeriodicalId":395433,"journal":{"name":"1999 IEEE Communications Theory Mini-Conference (Cat. No.99EX352)","volume":"108 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134296606","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
Adaptive prediction, tracking and power adjustment for frequency non-selective fast fading channels 频率非选择性快衰落信道的自适应预测、跟踪和功率调整
1999 IEEE Communications Theory Mini-Conference (Cat. No.99EX352) Pub Date : 1999-06-06 DOI: 10.1109/CTMC.1999.790226
T. Eyceoz, S. Hu, A. Duee-Hallen, H. Hallen
{"title":"Adaptive prediction, tracking and power adjustment for frequency non-selective fast fading channels","authors":"T. Eyceoz, S. Hu, A. Duee-Hallen, H. Hallen","doi":"10.1109/CTMC.1999.790226","DOIUrl":"https://doi.org/10.1109/CTMC.1999.790226","url":null,"abstract":"Previously, the authors introduced a novel algorithm for long range prediction of fading channels. This algorithm finds the linear minimum mean squared error (MMSE) estimate of the future fading coefficients given a fixed number of previous observations. In this paper, we show that the superior performance of this algorithm is due to its lower sampling rate relative to the conventional (data rate) methods of fading prediction. We also enhance the algorithm by an adaptive prediction and tracking method that increases accuracy and maintains the robustness of long-term prediction as the physical channel parameters vary. Finally, we show that large improvements in the bit error rate (BER) are possible when the proposed prediction method is used. In particular, analysis of the channel inversion with threshold technique is presented to demonstrate that the BER can be reduced to the level of and beyond the additive white Gaussian noise (AWGN) channel.","PeriodicalId":395433,"journal":{"name":"1999 IEEE Communications Theory Mini-Conference (Cat. No.99EX352)","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116828217","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: 23
CDMA space-time coding using an LMMSE receiver 使用LMMSE接收机的CDMA空时编码
1999 IEEE Communications Theory Mini-Conference (Cat. No.99EX352) Pub Date : 1999-06-06 DOI: 10.1109/CTMC.1999.790261
I. Oppermann
{"title":"CDMA space-time coding using an LMMSE receiver","authors":"I. Oppermann","doi":"10.1109/CTMC.1999.790261","DOIUrl":"https://doi.org/10.1109/CTMC.1999.790261","url":null,"abstract":"The field of space-time coding has attracted interest as a means of improving link reliability in mobile environments. In this paper, space-time coding is considered in conjunction with CDMA. The performance of a space-time-coded CDMA system is considered and comparisons are made to conventional CDMA systems.","PeriodicalId":395433,"journal":{"name":"1999 IEEE Communications Theory Mini-Conference (Cat. No.99EX352)","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129014844","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: 12
Decision-feedback differential detection of MDPSK for flat Rayleigh fading channels 平坦瑞利衰落信道中MDPSK的决策反馈差分检测
1999 IEEE Communications Theory Mini-Conference (Cat. No.99EX352) Pub Date : 1999-06-06 DOI: 10.1109/CTMC.1999.790252
R. Schober, W. Gerstacker, J. Huber
{"title":"Decision-feedback differential detection of MDPSK for flat Rayleigh fading channels","authors":"R. Schober, W. Gerstacker, J. Huber","doi":"10.1109/CTMC.1999.790252","DOIUrl":"https://doi.org/10.1109/CTMC.1999.790252","url":null,"abstract":"In this paper, decision-feedback differential detection (DF-DD) of M-ary differential phase-shift keying (MDPSK) signals, which has been introduced previously for the additive white Gaussian noise (AWGN) channel by Leib et al. (1988) and Edbauer (1992), is extended to flat Rayleigh fading channels. The DF-DD metric is derived from the multiple-symbol detection (MSD) metric and for error-free feedback an exact expression for the bit error rate for the widely used QDPSK constellation (M=4) is calculated. Furthermore, the dependence of the bit error rate on the power spectrum of the fading process is investigated for feedback filters of infinite order. It is shown that in this case, for ideally bandlimited fading processes the error floor of conventional differential detection (DD) can be remove entirely. Simulation results confirm that DF-DD with feedback filters of finite order can reduce the error floor of conventional DD significantly.","PeriodicalId":395433,"journal":{"name":"1999 IEEE Communications Theory Mini-Conference (Cat. No.99EX352)","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130278769","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: 119
Transmit diversity using decision-directed antenna hopping 使用决策定向天线跳频发射分集
1999 IEEE Communications Theory Mini-Conference (Cat. No.99EX352) Pub Date : 1999-06-06 DOI: 10.1109/CTMC.1999.790253
R. Heath, A. Paulraj
{"title":"Transmit diversity using decision-directed antenna hopping","authors":"R. Heath, A. Paulraj","doi":"10.1109/CTMC.1999.790253","DOIUrl":"https://doi.org/10.1109/CTMC.1999.790253","url":null,"abstract":"Transmit antenna diversity is a convenient means of obtaining diversity gain against Rayleigh fading in wireless systems where the mobile user has a limited number of antennas. Antenna hopping is one approach for using transmit antennas to obtain diversity gain. With antenna hopping, cyclic or pseudo-random hopping is used to transform spatial diversity into time diversity which can be exploited by appropriate error correction codes and interleaving techniques. Unfortunately, this incurs latency due to the interleaving requirements and/or possible bandwidth expansion due to the error correction code. To alleviate this problem we propose decision-directed antenna hopping where the antenna selected for transmission is a function of the current and past data. This enables diversity gain without constellation expansion, bandwidth expansion, of interleaving, similar in spirit to space-time trellis codes. We illustrate our idea with simple 2, 4, 8, and 16 state codes which achieve a rate of 1 b/s/HZ with two transmit antennas. Analytical calculations and simulations assuming perfect channel knowledge are used to characterize performance of these codes.","PeriodicalId":395433,"journal":{"name":"1999 IEEE Communications Theory Mini-Conference (Cat. No.99EX352)","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132499638","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: 22
Generalized MLSDE via the EM algorithm 基于EM算法的广义MLSDE
1999 IEEE Communications Theory Mini-Conference (Cat. No.99EX352) Pub Date : 1999-06-06 DOI: 10.1109/CTMC.1999.790251
H. Zamiri-Jafarian, S. Pasupathy
{"title":"Generalized MLSDE via the EM algorithm","authors":"H. Zamiri-Jafarian, S. Pasupathy","doi":"10.1109/CTMC.1999.790251","DOIUrl":"https://doi.org/10.1109/CTMC.1999.790251","url":null,"abstract":"Generalized maximum likelihood sequence detection and estimation (GMLSDE) is developed in this paper based on the expectation and maximization (EM) algorithm. The GMLSDE couples the estimation of channel parameters and data detection in the framework of the maximum likelihood (ML) criterion and unifies many MLSD/MLSDE structure receivers for different channel models. The GMLSDE clarifies the relation among channel model, receiver structure and degree of optimality. The per-survivor processing (PSP) and per-branch processing (PBP) methods emerge naturally from the EM aspect of the GMLSDE as well.","PeriodicalId":395433,"journal":{"name":"1999 IEEE Communications Theory Mini-Conference (Cat. No.99EX352)","volume":"518 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116249237","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
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