Pub Date : 2004-08-30DOI: 10.1109/ISSSTA.2004.1371656
A. Tulino, A. Lozano, S. Verdú
This paper presents analytical expressions for the capacity of single-user multi-antenna channels, known instantaneously by both transmitter and receiver, at moderate and high signal-to-noise ratios. Fading channels with both uncorrelated and correlated antennas are encompassed. The characterization is conducted primarily in the limit of large numbers of antennas, with accompanying examples that illustrate the validity of the results for even small numbers thereof. In the absence of correlation, the capacity is also tightly bounded for fixed numbers of antennas with compact closed-form expressions.
{"title":"MIMO capacity with channel state information at the transmitter","authors":"A. Tulino, A. Lozano, S. Verdú","doi":"10.1109/ISSSTA.2004.1371656","DOIUrl":"https://doi.org/10.1109/ISSSTA.2004.1371656","url":null,"abstract":"This paper presents analytical expressions for the capacity of single-user multi-antenna channels, known instantaneously by both transmitter and receiver, at moderate and high signal-to-noise ratios. Fading channels with both uncorrelated and correlated antennas are encompassed. The characterization is conducted primarily in the limit of large numbers of antennas, with accompanying examples that illustrate the validity of the results for even small numbers thereof. In the absence of correlation, the capacity is also tightly bounded for fixed numbers of antennas with compact closed-form expressions.","PeriodicalId":340769,"journal":{"name":"Eighth IEEE International Symposium on Spread Spectrum Techniques and Applications - Programme and Book of Abstracts (IEEE Cat. No.04TH8738)","volume":"285 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122977663","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 : 2004-08-30DOI: 10.1109/ISSSTA.2004.1371785
Jianming Zhu, Yeheskel Bar-Ness
A distributed signature sequence adaptation scheme is considered for the downlink of a MC-CDMA system, wherein each mobile user selfishly adapts its signature sequences to improve its own performance using measurements at its location with no consideration to the performance of other users in the system. The convergence of such an adaptation scheme is shown using a game theory framework. That is, with any initial signature sequences in the system, the proposed adaptation scheme definitely converges to a set of signature sequences at which no user can further improve its own performance with individual adaptation.
{"title":"Distributed signature sequence adaptation for downlink multicode MC-CDMA system","authors":"Jianming Zhu, Yeheskel Bar-Ness","doi":"10.1109/ISSSTA.2004.1371785","DOIUrl":"https://doi.org/10.1109/ISSSTA.2004.1371785","url":null,"abstract":"A distributed signature sequence adaptation scheme is considered for the downlink of a MC-CDMA system, wherein each mobile user selfishly adapts its signature sequences to improve its own performance using measurements at its location with no consideration to the performance of other users in the system. The convergence of such an adaptation scheme is shown using a game theory framework. That is, with any initial signature sequences in the system, the proposed adaptation scheme definitely converges to a set of signature sequences at which no user can further improve its own performance with individual adaptation.","PeriodicalId":340769,"journal":{"name":"Eighth IEEE International Symposium on Spread Spectrum Techniques and Applications - Programme and Book of Abstracts (IEEE Cat. No.04TH8738)","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123878895","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 : 2004-08-30DOI: 10.1109/ISSSTA.2004.1371773
P. Omiyi, H. Haas
A novel strategy is presented to maximise spectral efficiency in 3rd generation (3G) wireless communications. This strategy involves, first, permitting peer-to-peer UTRA TDD communication, in the under-utilised UTRA FDD uplink, at the edges of UTRA FDD cells. Consequently, a novel medium-access-control protocol, denoted as channel-sensing TDMA TDD, is employed to efficiently co-ordinate the peer-to-peer UTRA TDD communication. Channel-sensing TDMA TDD employs a modified busy-tone broadcast/channel-sensing mechanism to avoid and mitigate high interference scenarios. Results show significant improvements in system capacity and spectral-efficiency from the application of this novel approach in 3G.
{"title":"Maximising spectral efficiency in 3G with hybrid ad-hoc UTRA TDD/UTRA FDD cellular mobile communications","authors":"P. Omiyi, H. Haas","doi":"10.1109/ISSSTA.2004.1371773","DOIUrl":"https://doi.org/10.1109/ISSSTA.2004.1371773","url":null,"abstract":"A novel strategy is presented to maximise spectral efficiency in 3rd generation (3G) wireless communications. This strategy involves, first, permitting peer-to-peer UTRA TDD communication, in the under-utilised UTRA FDD uplink, at the edges of UTRA FDD cells. Consequently, a novel medium-access-control protocol, denoted as channel-sensing TDMA TDD, is employed to efficiently co-ordinate the peer-to-peer UTRA TDD communication. Channel-sensing TDMA TDD employs a modified busy-tone broadcast/channel-sensing mechanism to avoid and mitigate high interference scenarios. Results show significant improvements in system capacity and spectral-efficiency from the application of this novel approach in 3G.","PeriodicalId":340769,"journal":{"name":"Eighth IEEE International Symposium on Spread Spectrum Techniques and Applications - Programme and Book of Abstracts (IEEE Cat. No.04TH8738)","volume":"137 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121306068","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 : 2004-08-30DOI: 10.1109/ISSSTA.2004.1371679
C. Pietsch, J. Lindner
The paper addresses two aspects related to orthogonal space-time block codes (STBCs). First, it is shown how to embed orthogonal STBCs into a truly linear matrix transmission model using real-valued notation. Thus, orthogonal STBCs may be interpreted as linear spreading in space and time. It simplifies analytical analysis considerably and puts them on a common basis with other multi subchannel schemes. Second, we consider channel estimation for orthogonal STBCs. We provide a brief analytical analysis on the degradation that is due to pilot based maximum likelihood channel estimation. Further, we exploit the fact that Alamouti's scheme does not only provide a simple maximum likelihood estimate of the data, but may also be deployed to obtain independent estimates of the MIMO channel impulse responses by a linear transformation simply using arbitrary detected data symbols. It is also shown how this fits into the framework of real-valued notation.
{"title":"Real-valued modeling and channel estimation for transmissions based on orthogonal STBCs","authors":"C. Pietsch, J. Lindner","doi":"10.1109/ISSSTA.2004.1371679","DOIUrl":"https://doi.org/10.1109/ISSSTA.2004.1371679","url":null,"abstract":"The paper addresses two aspects related to orthogonal space-time block codes (STBCs). First, it is shown how to embed orthogonal STBCs into a truly linear matrix transmission model using real-valued notation. Thus, orthogonal STBCs may be interpreted as linear spreading in space and time. It simplifies analytical analysis considerably and puts them on a common basis with other multi subchannel schemes. Second, we consider channel estimation for orthogonal STBCs. We provide a brief analytical analysis on the degradation that is due to pilot based maximum likelihood channel estimation. Further, we exploit the fact that Alamouti's scheme does not only provide a simple maximum likelihood estimate of the data, but may also be deployed to obtain independent estimates of the MIMO channel impulse responses by a linear transformation simply using arbitrary detected data symbols. It is also shown how this fits into the framework of real-valued notation.","PeriodicalId":340769,"journal":{"name":"Eighth IEEE International Symposium on Spread Spectrum Techniques and Applications - Programme and Book of Abstracts (IEEE Cat. No.04TH8738)","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128426141","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 : 2004-08-30DOI: 10.1109/ISSSTA.2004.1371700
Jae-Hoon Kim
Focusing on multicast transmission in a CDMA based 3G system, we address a soft-combine zone configuration. Finding the unique characteristic on neighboring locations of soft-combine supporting cells, we formulate a mathematical program maximizing the benefit of soft-combining in multicast transmission. The solution shows the efficient soft-combine zone configurations, which demonstrates the effects of cohesion on the data stream among neighboring cells.
{"title":"Optimal soft-combine zone configuration in a multicast CDMA network","authors":"Jae-Hoon Kim","doi":"10.1109/ISSSTA.2004.1371700","DOIUrl":"https://doi.org/10.1109/ISSSTA.2004.1371700","url":null,"abstract":"Focusing on multicast transmission in a CDMA based 3G system, we address a soft-combine zone configuration. Finding the unique characteristic on neighboring locations of soft-combine supporting cells, we formulate a mathematical program maximizing the benefit of soft-combining in multicast transmission. The solution shows the efficient soft-combine zone configurations, which demonstrates the effects of cohesion on the data stream among neighboring cells.","PeriodicalId":340769,"journal":{"name":"Eighth IEEE International Symposium on Spread Spectrum Techniques and Applications - Programme and Book of Abstracts (IEEE Cat. No.04TH8738)","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128472699","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 : 2004-08-30DOI: 10.1109/ISSSTA.2004.1371789
A. Kuramoto, T. Abrão, P. Jeszensky
Walsh-Hadamard, QS, Lin-Chang, LCZ-GMW, ZCZ sets of sequences are compared. The comparison is accomplished by analyzing the conventional receiver (RAKE) and a parallel interference canceller (PIC) receiver performance using each one of these sequence sets in a multipath Rayleigh fading channel and similar system loads in a quasi-synchronous condition.
{"title":"Sets of sequences for QS-CDMA systems with interference cancellation over multipath Rayleigh fading channels","authors":"A. Kuramoto, T. Abrão, P. Jeszensky","doi":"10.1109/ISSSTA.2004.1371789","DOIUrl":"https://doi.org/10.1109/ISSSTA.2004.1371789","url":null,"abstract":"Walsh-Hadamard, QS, Lin-Chang, LCZ-GMW, ZCZ sets of sequences are compared. The comparison is accomplished by analyzing the conventional receiver (RAKE) and a parallel interference canceller (PIC) receiver performance using each one of these sequence sets in a multipath Rayleigh fading channel and similar system loads in a quasi-synchronous condition.","PeriodicalId":340769,"journal":{"name":"Eighth IEEE International Symposium on Spread Spectrum Techniques and Applications - Programme and Book of Abstracts (IEEE Cat. No.04TH8738)","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117066016","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 : 2004-08-30DOI: 10.1109/ISSSTA.2004.1371825
J. Hamalainen, K. Pajukoski, E. Tiirola, R. Wichman, J. Ylitalo
We examine the uplink performance of MIMO systems in UTRA FDD mode using analytical tools and simulations. Results show that the uplink performance of the UTRA FDD mode is significantly improved by SIMO and MIMO techniques. While the performance increase from additional receive antennas in the base station reflects straightforwardly to the results, the diversity gain from additional transmit antennas at the mobile end is small. Thus, multiple transmit antennas should be used for spatial multiplexing instead of diversity.
{"title":"MIMO performance in UTRA FDD uplink","authors":"J. Hamalainen, K. Pajukoski, E. Tiirola, R. Wichman, J. Ylitalo","doi":"10.1109/ISSSTA.2004.1371825","DOIUrl":"https://doi.org/10.1109/ISSSTA.2004.1371825","url":null,"abstract":"We examine the uplink performance of MIMO systems in UTRA FDD mode using analytical tools and simulations. Results show that the uplink performance of the UTRA FDD mode is significantly improved by SIMO and MIMO techniques. While the performance increase from additional receive antennas in the base station reflects straightforwardly to the results, the diversity gain from additional transmit antennas at the mobile end is small. Thus, multiple transmit antennas should be used for spatial multiplexing instead of diversity.","PeriodicalId":340769,"journal":{"name":"Eighth IEEE International Symposium on Spread Spectrum Techniques and Applications - Programme and Book of Abstracts (IEEE Cat. No.04TH8738)","volume":"103 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115540804","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 : 2004-08-30DOI: 10.1109/ISSSTA.2004.1371822
P. Burns, M. Reed
The paper determines a cost function for a network of wideband code division multiple access (WCDMA) frequency division duplex (FDD) base transceiver stations (BTS) for the purpose of dimensioning a software defined radio (SDR) implementation. An SDR architecture is proposed and the cost function is expressed in terms of cell diameter and signal processing load. The cost function is developed in terms of a large number of system parameters. Based on certain assumptions, a cell diameter is determined which minimizes the cost function and therefore provides the minimal computational complexity SDR.
{"title":"A complexity cost function for the signal processing in a WCDMA base station for dimensioning of a software defined radio","authors":"P. Burns, M. Reed","doi":"10.1109/ISSSTA.2004.1371822","DOIUrl":"https://doi.org/10.1109/ISSSTA.2004.1371822","url":null,"abstract":"The paper determines a cost function for a network of wideband code division multiple access (WCDMA) frequency division duplex (FDD) base transceiver stations (BTS) for the purpose of dimensioning a software defined radio (SDR) implementation. An SDR architecture is proposed and the cost function is expressed in terms of cell diameter and signal processing load. The cost function is developed in terms of a large number of system parameters. Based on certain assumptions, a cell diameter is determined which minimizes the cost function and therefore provides the minimal computational complexity SDR.","PeriodicalId":340769,"journal":{"name":"Eighth IEEE International Symposium on Spread Spectrum Techniques and Applications - Programme and Book of Abstracts (IEEE Cat. No.04TH8738)","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125377222","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 : 2004-08-30DOI: 10.1109/ISSSTA.2004.1371792
R. Heath, J. Tropp, I. Dhillon, T. Strohmer
Welch bound equality (WBE) signature sequences maximize the uplink sum capacity in direct-spread synchronous code division multiple access (CDMA) systems. WBE sequences have a nice interference invariance property that typically holds only when the system is fully loaded, and, to maintain this property, the signature set must be redesigned and reassigned as the number of active users changes. An additional equiangular constraint on the signature set, however, maintains interference invariance. Finding such signatures requires equiangular side constraints to be imposed on an inverse eigenvalue problem. The paper presents an alternating projection algorithm that can design WBE sequences that satisfy equiangular side constraints. The proposed algorithm can be used to find Grassmannian frames as well as equiangular tight frames. Though one projection is onto a closed, but non-convex, set, it is shown that this algorithm converges to a fixed point, and these fixed points are partially characterized.
{"title":"Construction of equiangular signatures for synchronous CDMA systems","authors":"R. Heath, J. Tropp, I. Dhillon, T. Strohmer","doi":"10.1109/ISSSTA.2004.1371792","DOIUrl":"https://doi.org/10.1109/ISSSTA.2004.1371792","url":null,"abstract":"Welch bound equality (WBE) signature sequences maximize the uplink sum capacity in direct-spread synchronous code division multiple access (CDMA) systems. WBE sequences have a nice interference invariance property that typically holds only when the system is fully loaded, and, to maintain this property, the signature set must be redesigned and reassigned as the number of active users changes. An additional equiangular constraint on the signature set, however, maintains interference invariance. Finding such signatures requires equiangular side constraints to be imposed on an inverse eigenvalue problem. The paper presents an alternating projection algorithm that can design WBE sequences that satisfy equiangular side constraints. The proposed algorithm can be used to find Grassmannian frames as well as equiangular tight frames. Though one projection is onto a closed, but non-convex, set, it is shown that this algorithm converges to a fixed point, and these fixed points are partially characterized.","PeriodicalId":340769,"journal":{"name":"Eighth IEEE International Symposium on Spread Spectrum Techniques and Applications - Programme and Book of Abstracts (IEEE Cat. No.04TH8738)","volume":"91 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126658850","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 : 2004-08-30DOI: 10.1109/ISSSTA.2004.1371707
N. Souto, J.C. Silva, A. Correia, F. Cercas, A. Rodrigues
The paper studies the performance of a UMTS system using a code-spread CS-CDMA scheme with the aim of improving both uplink and downlink performances. This scheme employs low rate partitioned turbo super-orthogonal codes alone for achieving the bandwidth expansion. Additionally, a scrambling code with no spreading is used for distinguishing simultaneous users. Modifications to the current UMTS structure in order to accommodate this new scheme are also discussed. To evaluate and compare the performances of the actual DS-CDMA scheme and the proposed CS-CDMA scheme, a stand-alone simulator was built and the results are presented and discussed.
{"title":"Partitioned turbo super-orthogonal codes for a UMTS CS-CDMA scheme","authors":"N. Souto, J.C. Silva, A. Correia, F. Cercas, A. Rodrigues","doi":"10.1109/ISSSTA.2004.1371707","DOIUrl":"https://doi.org/10.1109/ISSSTA.2004.1371707","url":null,"abstract":"The paper studies the performance of a UMTS system using a code-spread CS-CDMA scheme with the aim of improving both uplink and downlink performances. This scheme employs low rate partitioned turbo super-orthogonal codes alone for achieving the bandwidth expansion. Additionally, a scrambling code with no spreading is used for distinguishing simultaneous users. Modifications to the current UMTS structure in order to accommodate this new scheme are also discussed. To evaluate and compare the performances of the actual DS-CDMA scheme and the proposed CS-CDMA scheme, a stand-alone simulator was built and the results are presented and discussed.","PeriodicalId":340769,"journal":{"name":"Eighth IEEE International Symposium on Spread Spectrum Techniques and Applications - Programme and Book of Abstracts (IEEE Cat. No.04TH8738)","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128104825","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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