Pub Date : 2005-06-05DOI: 10.1109/SPAWC.2005.1506289
K. Afkhamie, H. Latchman, L. Yonge, Timothy N. Davidson, Richard E. Newman
The primary subject of this paper is the selection of a pulse-shaping waveform for in-home power line communications. As system performance is also determined by other parameters affecting the length and shaping of the OFDM symbol, the problem formulation is expanded to also include the simultaneous selection of guard interval length and Hanning window length, creating a joint optimization problem. Given the constraints of allowing no transmit notch filters, and adequate receive side mitigation of narrow band jammers, we jointly optimize the selection of guard interval length, transmit pulse-shaping and receive side windowing for throughput performance on the average power line channel. Throughput performance is inferred from SNR data and associated guard interval overhead. We also present results of performance assessment and parameter selection, for the average power line channel, based on a collection of 120 measured power line channel impulse responses.
{"title":"Joint optimization of transmit pulse shaping, guard interval length, and receiver side narrow-band interference mitigation in the HomePlugAV OFDM system","authors":"K. Afkhamie, H. Latchman, L. Yonge, Timothy N. Davidson, Richard E. Newman","doi":"10.1109/SPAWC.2005.1506289","DOIUrl":"https://doi.org/10.1109/SPAWC.2005.1506289","url":null,"abstract":"The primary subject of this paper is the selection of a pulse-shaping waveform for in-home power line communications. As system performance is also determined by other parameters affecting the length and shaping of the OFDM symbol, the problem formulation is expanded to also include the simultaneous selection of guard interval length and Hanning window length, creating a joint optimization problem. Given the constraints of allowing no transmit notch filters, and adequate receive side mitigation of narrow band jammers, we jointly optimize the selection of guard interval length, transmit pulse-shaping and receive side windowing for throughput performance on the average power line channel. Throughput performance is inferred from SNR data and associated guard interval overhead. We also present results of performance assessment and parameter selection, for the average power line channel, based on a collection of 120 measured power line channel impulse responses.","PeriodicalId":105190,"journal":{"name":"International Workshop on Signal Processing Advances in Wireless Communications","volume":"159 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125485915","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 : 2005-06-05DOI: 10.1109/SPAWC.2005.1506262
Xiaoli Ma, L. Song, J. Kleider
In orthogonal frequency division multiplexing (OFDM) systems, the length of the cyclic prefix (CP) has to be greater than the length of the channel impulse response to avoid inter-symbol interference. However, a long CP costs extra bandwidth and reduces power efficiency. This paper designs a channel shortening filter for differential OFDM systems with unknown multipath channels with long delay spreads. Without introducing extra redundancy, our design shortens the length of the effective channel response and bypasses the channel estimation, thus improving bandwidth and power efficiencies. The design is easy to be implemented at both transmitter and receiver with low computational complexity. Simulation results corroborate the merits of our design.
{"title":"Channel shortening equalization for differential OFDM systems","authors":"Xiaoli Ma, L. Song, J. Kleider","doi":"10.1109/SPAWC.2005.1506262","DOIUrl":"https://doi.org/10.1109/SPAWC.2005.1506262","url":null,"abstract":"In orthogonal frequency division multiplexing (OFDM) systems, the length of the cyclic prefix (CP) has to be greater than the length of the channel impulse response to avoid inter-symbol interference. However, a long CP costs extra bandwidth and reduces power efficiency. This paper designs a channel shortening filter for differential OFDM systems with unknown multipath channels with long delay spreads. Without introducing extra redundancy, our design shortens the length of the effective channel response and bypasses the channel estimation, thus improving bandwidth and power efficiencies. The design is easy to be implemented at both transmitter and receiver with low computational complexity. Simulation results corroborate the merits of our design.","PeriodicalId":105190,"journal":{"name":"International Workshop on Signal Processing Advances in Wireless Communications","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116066698","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 : 2005-06-05DOI: 10.1109/SPAWC.2005.1505876
Q. Ma, C. Tepedelenlioğlu
This paper studies receive antenna selection (AS) for multi-antenna systems that employ differential unitary space-time signals, where the channel state information (CSI) is neither known at the transmitter nor at the receiver. We perform AS only at the receiver and the selection is based on a maximum-norm criterion, i.e. a subset of receive antennas that have the largest received signal power is chosen. Using a Chernoff bound approach, we present theoretical performance analysis based on the pairwise error probability (PEP) and quantify the asymptotic performance at high SNR by giving the diversity and coding gain expressions. We prove that with no CSI at the receiver, the diversity gain with AS is preserved for differential unitary space-time codes with full spatial diversity, the same as the case with known CSI. Corroborating simulations validate our analysis.
{"title":"Antenna selection for differential unitary space-time modulation","authors":"Q. Ma, C. Tepedelenlioğlu","doi":"10.1109/SPAWC.2005.1505876","DOIUrl":"https://doi.org/10.1109/SPAWC.2005.1505876","url":null,"abstract":"This paper studies receive antenna selection (AS) for multi-antenna systems that employ differential unitary space-time signals, where the channel state information (CSI) is neither known at the transmitter nor at the receiver. We perform AS only at the receiver and the selection is based on a maximum-norm criterion, i.e. a subset of receive antennas that have the largest received signal power is chosen. Using a Chernoff bound approach, we present theoretical performance analysis based on the pairwise error probability (PEP) and quantify the asymptotic performance at high SNR by giving the diversity and coding gain expressions. We prove that with no CSI at the receiver, the diversity gain with AS is preserved for differential unitary space-time codes with full spatial diversity, the same as the case with known CSI. Corroborating simulations validate our analysis.","PeriodicalId":105190,"journal":{"name":"International Workshop on Signal Processing Advances in Wireless Communications","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121491903","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 : 2005-06-05DOI: 10.1109/SPAWC.2005.1506208
M. Kuhn, A. Wittneben
In this paper we investigate the use of power-line communication (PLC) to assist cooperative wireless relaying. We consider a communication scheme that uses the power-line to initialize and synchronize wireless amplify-and-forward (AF) relays and to broadcast information between the relays. Based on the analysis of transfer function and noise measurements of PLC channels in office and residential environments we propose a transmission scheme for the inter-relay-communication over power-lines and assess the influence of this scheme on wireless relaying. The use of PLC leads to a very flexible way of enhancing wireless communications by plugging in additional relays where they are needed-without additional wiring.
{"title":"Wireless relaying with partial cooperation based on power-line communication","authors":"M. Kuhn, A. Wittneben","doi":"10.1109/SPAWC.2005.1506208","DOIUrl":"https://doi.org/10.1109/SPAWC.2005.1506208","url":null,"abstract":"In this paper we investigate the use of power-line communication (PLC) to assist cooperative wireless relaying. We consider a communication scheme that uses the power-line to initialize and synchronize wireless amplify-and-forward (AF) relays and to broadcast information between the relays. Based on the analysis of transfer function and noise measurements of PLC channels in office and residential environments we propose a transmission scheme for the inter-relay-communication over power-lines and assess the influence of this scheme on wireless relaying. The use of PLC leads to a very flexible way of enhancing wireless communications by plugging in additional relays where they are needed-without additional wiring.","PeriodicalId":105190,"journal":{"name":"International Workshop on Signal Processing Advances in Wireless Communications","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130658535","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 : 1900-01-01DOI: 10.1109/SPAWC51858.2021.9593167
P. Hougne
Radio localization is a key enabling technology for situational awareness but conventional techniques based on elaborate ray-tracing approaches naturally struggle in rich scattering environments (inside rooms, metro stations, planes, vessels, …). Here, we discuss a completely different approach to radio localization: instead of attempting to understand rich scattering wave propagation in terms of rays, we harness the overwhelming complexity because it assigns unique wave finger-prints to each object position. We interpret wave propagation as a physical encoder of the sought-after localization information in multiplexed measurements and detail artificial neural network (ANN) architectures suitable to decode these measurements for a single or multiple, discrete or continuous, sought-after location variable(s). Capitalizing on recent physics-driven experiments, we clarify that the proposed technique is very robust to measurement noise and capable of achieving deeply sub-wavelength localization precision. The discussed technique can be implemented with multiplexing across spatial, spectral or configurational degrees of freedom, corresponding to sensor networks, broadband measurements and RIS-programmable environments, respectively. Specifically, multiplexing across a fixed random sequence of RIS configurations enables single-frequency localization with a single node. Finally, we propose an end-to-end vision of the technique in which programmable RIS elements take the role of physical weights in a hybrid analog-digital ANN. Thereby, relevant information for the localization task can be discriminated from irrelevant information already in the measurement process, enabling substantial latency improvements.
{"title":"RIS-Based Radio Localization in Rich Scattering Environments: Harnessing Multi-Path with ANN Decoders","authors":"P. Hougne","doi":"10.1109/SPAWC51858.2021.9593167","DOIUrl":"https://doi.org/10.1109/SPAWC51858.2021.9593167","url":null,"abstract":"Radio localization is a key enabling technology for situational awareness but conventional techniques based on elaborate ray-tracing approaches naturally struggle in rich scattering environments (inside rooms, metro stations, planes, vessels, …). Here, we discuss a completely different approach to radio localization: instead of attempting to understand rich scattering wave propagation in terms of rays, we harness the overwhelming complexity because it assigns unique wave finger-prints to each object position. We interpret wave propagation as a physical encoder of the sought-after localization information in multiplexed measurements and detail artificial neural network (ANN) architectures suitable to decode these measurements for a single or multiple, discrete or continuous, sought-after location variable(s). Capitalizing on recent physics-driven experiments, we clarify that the proposed technique is very robust to measurement noise and capable of achieving deeply sub-wavelength localization precision. The discussed technique can be implemented with multiplexing across spatial, spectral or configurational degrees of freedom, corresponding to sensor networks, broadband measurements and RIS-programmable environments, respectively. Specifically, multiplexing across a fixed random sequence of RIS configurations enables single-frequency localization with a single node. Finally, we propose an end-to-end vision of the technique in which programmable RIS elements take the role of physical weights in a hybrid analog-digital ANN. Thereby, relevant information for the localization task can be discriminated from irrelevant information already in the measurement process, enabling substantial latency improvements.","PeriodicalId":105190,"journal":{"name":"International Workshop on Signal Processing Advances in Wireless Communications","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120956765","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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