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Crosslayer design for optimizing TCP performance
 in Proc. IEEE ICC, Seoul, Korea
, 2005
"... Abstract — In this paper, we propose and analyze novel and efficient crosslayer designs involving joint optimization of physical, link, and TCP layers in wireless. Particularly, we investigate the design of symbol mapping diversity (SMD) schemes using MQAM at the physical layer for optimal goodput ..."
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Abstract — In this paper, we propose and analyze novel and efficient crosslayer designs involving joint optimization of physical, link, and TCP layers in wireless. Particularly, we investigate the design of symbol mapping diversity (SMD) schemes using MQAM at the physical layer for optimal goodput performance at the TCP layer. We present the design and TCP goodput analysis of two SMD schemes, one applying SMD at the TCP packet level, termed as Full Packet SMD (FP SMD), and the other applying SMD at the link layer (LL) packet level, termed as LL ARQ SMD. We show that although the LL ARQ SMD scheme offers good TCP goodput at high SNRs, it performs poorer compared to FP SMD scheme at low SNRs because of increased delays incurred due to increased LL retransmissions at low SNRs. We therefore propose and analyze a hybrid SMD scheme which adaptively switches modes (between LL ARQ SMD and FP SMD) based on measured LL packet error rate. We show that the hybrid SMD scheme combines the best TCP performance of both LL ARQ SMD and FP SMD under varying channel conditions. Keywords – MQAM, symbol mapping diversity, ARQ, TCP, goodput. I.
Gaussian Broadcast Channels with an Orthogonal and Bidirectional Cooperation Link
, 2008
"... This paper considers a system where one transmitter broadcasts a single common message to two receivers linked by a bidirectional cooperation channel, which is assumed to be orthogonal to the downlink channel. Assuming a simplified setup where, in particular, scalar relaying protocols are used and c ..."
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This paper considers a system where one transmitter broadcasts a single common message to two receivers linked by a bidirectional cooperation channel, which is assumed to be orthogonal to the downlink channel. Assuming a simplified setup where, in particular, scalar relaying protocols are used and channel coding is not exploited, we want to provide elements of response to several questions of practical interest. Here are the main underlying issues: (1) the way of recombining the signals at the receivers; (2) the optimal number of cooperation rounds; (3) the way of cooperating (symmetrically or asymmetrically, which receiver should start cooperating in the latter case); and (4) the influence of spectral resources. These issues are considered by studying the performance of the assumed system through analytical results when they are derivable and through simulation results. For the particular choices we made, the results sometimes do not coincide with those available for the discrete counterpart of the studied channel.
Research Article Gaussian Broadcast Channels with an Orthogonal and Bidirectional Cooperation Link
, 2009
"... This paper considers a system where one transmitter broadcasts a single common message to two receivers linked by a bidirectional cooperation channel, which is assumed to be orthogonal to the downlink channel. Assuming a simplified setup where, in particular, scalar relaying protocols are used and c ..."
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This paper considers a system where one transmitter broadcasts a single common message to two receivers linked by a bidirectional cooperation channel, which is assumed to be orthogonal to the downlink channel. Assuming a simplified setup where, in particular, scalar relaying protocols are used and channel coding is not exploited, we want to provide elements of response to several questions of practical interest. Here are the main underlying issues: (1) the way of recombining the signals at the receivers; (2) the optimal number of cooperation rounds; (3) the way of cooperating (symmetrically or asymmetrically, which receiver should start cooperating in the latter case); and (4) the influence of spectral resources. These issues are considered by studying the performance of the assumed system through analytical results when they are derivable and through simulation results. For the particular choices we made, the results sometimes do not coincide with those available for the discrete counterpart of the studied channel. Copyright © 2008 E. V. Belmega et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. 1.
constellation rearrangement ‡
"... Evaluation of bit error rate for packet combining with ..."
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