1,957 Hits in 5.1 sec

Suboptimality of TDMA in the Low-Power Regime

G. Caire, D. Tuninetti, S. Verdu
2004 IEEE Transactions on Information Theory  
We consider multiaccess, broadcast, and interference channels with additive Gaussian noise.  ...  ' energy per bit are identical and broadcast channels where the receivers have identical signal-to-noise ratios.  ...  Theorem 3 for TDMA and superposition coding, respectively.  ... 
doi:10.1109/tit.2004.825003 fatcat:qzmufuemyndjvfjlgjmovwjamm

Hybrid Digital-Analog Codes for Source-Channel Broadcast of Gaussian Sources over Gaussian Channels [article]

Vinod M. Prabhakaran, Rohit Puri, Kannan Ramchandran
2011 arXiv   pre-print
When specialized to the open problem of broadcasting a white Gaussian source over an additive white Gaussian noise broadcast channel with bandwidth mismatch which has been the subject of several previous  ...  A hybrid digital-analog coding strategy which combines source coding with side information, channel coding with side information, layered source coding, and superposition broadcast channel coding is presented  ...  ACKNOWLEDGEMENT The authors would like to thank the reviewers for their careful reading and their suggestions which have helped improve the quality of this paper.  ... 
arXiv:1101.5207v1 fatcat:3g2uc4wv7rhtfbujmrcwjqfh5m

Performance regimes of uncoded linear communications over AWGN channels

Szymon Jakubczak, John Z. Sun, Dina Katabi, Vivek K. Goyal
2011 2011 45th Annual Conference on Information Sciences and Systems  
The conventional approach to JSCC which combines successive refinement with superposition coding is still digital and separable.  ...  Joint source-channel coding (JSCC) has recently received increasing interest to address the varying nature of the wireless channel conditions (under mobility or multicast).  ...  The achievable rate region can be obtained by superposition coding, where the encoder splits the bit-stream into lowpriority enhancement at rate R 1 and high-priority base at rate R 2 , channel-codes them  ... 
doi:10.1109/ciss.2011.5766155 dblp:conf/ciss/JakubczakSKG11 fatcat:wqtzoiq7gze25p7uz5t73icpkm

Hybrid digital-analog joint source-channel coding for broadcasting correlated Gaussian sources

Hamid Behroozi, Fady Alajaji, Tamas Linder
2009 2009 IEEE International Symposium on Information Theory  
We consider the transmission of a bivariate Gaussian source S = (S1, S2) across a power-limited two-user Gaussian broadcast channel.  ...  Using numerical examples, we demonstrate that for bandwidth compression, a three-layered coding scheme consisting of analog, superposition, and Costa coding performs well compared to the other provided  ...  On the other hand, for the point-to-point transmission of a single Gaussian source through an additive white Gaussian noise (AWGN) channel it is well known that if the channel and source bandwidths are  ... 
doi:10.1109/isit.2009.5205799 dblp:conf/isit/BehrooziAL09 fatcat:nqqsbv4nyvdhvla62bwqfxbbda

Recent mum on the capacity of wideband channels in the low-power regime

S. Verdu
2002 IEEE wireless communications  
Results on channel capacity and optimum signaling are reviewed for both point-to-point channels and multiuser channels.  ...  This article gives a brief overview of recent results on the limits of reliable communication in the low-power wideband regime from the standpoint of information theory.  ...  by TDMA. • Whereas in both multi-access and broadcast channels [26] , TDMA achieves the same as in the single-user channel reviewed in an earlier section, superposition requires less bandwidth than TDMA  ... 
doi:10.1109/mwc.2002.1028876 fatcat:eqcwgt3zjnby3ppnxvue5phn6i

On the Performance of Hybrid Digital-Analog Coding for Broadcasting Correlated Gaussian Sources

Hamid Behroozi, Fady Alajaji, Tamas Linder
2011 IEEE Transactions on Communications  
We consider the problem of sending a bivariate Gaussian source = ( 1, 2) across a power-limited two-user Gaussian broadcast channel.  ...  Index Terms-Gaussian broadcast channel, bandwidth compression/expansion, joint source-channel coding, hybrid digitalanalog (HDA) coding, Costa coding, Wyner-Ziv coding, layered coding, uncoded transmission  ...  The two codes are superpositioned and transmitted across a power-limited Gaussian two-user broadcast channel. constraint and with respective noise variances 1 and 2 ( 1 > 2 ) (e.g., see [4] ).  ... 
doi:10.1109/tcomm.2011.101011.100483 fatcat:5q5mvkiypvf2ldg3v3skdc4edu

The capacity of downlink fading channels with variable rate and power

A.J. Goldsmith
1997 IEEE Transactions on Vehicular Technology  
We obtain the Shannon capacity region of the downlink (broadcast) channel in fading and additive white Gaussian noise (AWGN) for time-division, frequency-division, and codedivision.  ...  In addition, the optimal nonorthogonal code is a multiresolution code which does not increase the signal bandwidth.  ...  For a total bandwidth constraint , the information bandwidth of each user's signal with these spreading codes is thus limited to .  ... 
doi:10.1109/25.618181 fatcat:wz6ymokrijfrleetl6krv5u2cy

Communication Via Decentralized Processing

A. Sanderovich, S. Shamai, Y. Steinberg, G. Kramer
2008 IEEE Transactions on Information Theory  
The Gaussian codebook capacity for the case where the agents do not have any decoding ability is characterized for the Gaussian channel.  ...  For both general and degraded discrete memoryless channels, lower and upper bounds on the capacity are derived.  ...  ACKNOWLEDGMENT The authors are indebted to Michael Peleg for helpful discussions.  ... 
doi:10.1109/tit.2008.924659 fatcat:4hyzzx4b7zfxxhhu6i3ybzlkse

Communication via decentralized processing

A. Sanderovich, S. Shamai, Y. Steinberg, G. Kramer
2005 Proceedings. International Symposium on Information Theory, 2005. ISIT 2005.  
The Gaussian codebook capacity for the case where the agents do not have any decoding ability is characterized for the Gaussian channel.  ...  For both general and degraded discrete memoryless channels, lower and upper bounds on the capacity are derived.  ...  ACKNOWLEDGMENT The authors are indebted to Michael Peleg for helpful discussions.  ... 
doi:10.1109/isit.2005.1523532 dblp:conf/isit/SanderovichSSK05 fatcat:qucp2vrnl5d7dlcxaxgf6islvm

Effect of Bit Error Rate in LDPC Based OFDM System over AWGN Raician And Raileigh Fading Channels

Pragya Sharma
2015 International Journal on Recent and Innovation Trends in Computing and Communication  
The OFDM technique can be implemented using Low Density Parity Check (LDPC) Codes because of their ability to reaching near Shannon limit performance.  ...  In this paper we are presenting the effect of Bit Error Rate (BER) with Signal to Noise Ratio (SNR) in OFDM system which is based on LDPC over Additive White Gaussian Noise (AWGN), Rician and Rayliegh  ...  ADDITIVE WHITE GAUSSIAN noise (AWGN) channel is a universal channel model for analyzing modulation schemes.  ... 
doi:10.17762/ijritcc2321-8169.150377 fatcat:s3nfdrdcp5atjfe7gevs7la34m

Coded wireless video broadcast/ multicast

James She, En-hui Yang, Pin-Han Ho
2011 Proceedings of the 6th ACM workshop on Wireless multimedia networking and computing - WMuNeP '11  
The cross-layer framework in [ [32]] incorporates adaptive power allocation and channel coding strategies by considering the interference-limited and bandwidth-limited characteristics of a broadcast/  ...  of scalable video coding at the source, modified multiple description coding for erasure protection, and superposition coding at the channel.  ... 
doi:10.1145/2069117.2069123 fatcat:xc7bt5fetfcprdiy5o3ino2eom

Constellation Shaping For Broadcast Channels In Practical Situations

Marie-Line Alberi Morel, P. Duhamel, Zeina Mheich, Leszek Szczecinski
2011 Zenodo  
Publication in the conference proceedings of EUSIPCO, Barcelona, Spain, 2011  ...  Superposition coding has been shown to reach the theoretical capacity limit for twousers AWGN broadcast channel using an infinite Gaussian input alphabet [1] .  ...  The theoretical limit of the capacity region of the two users Gaussian broadcast channel is achieved using superposition coding of two Gaussian signals intended for the two users.  ... 
doi:10.5281/zenodo.42616 fatcat:jrblbfyfurbh5dymjdrmnz7fky

Comparison of Broadcasting Schemes for Infrastructure to Vehicular Communications

Biplab Sikdar
2012 IEEE transactions on intelligent transportation systems (Print)  
For these regimes, it is shown that the broadcast capacities associated with superposition coding are optimal.  ...  This paper considers the broadcast capacity of broadcast schemes and evaluates and compares the broadcast capacity of strategies based on time-splitting, frequency-splitting and superposition coding.  ...  The channel bandwidth is assumed to be W Hz and the communication channel is subject to additive white Gaussian noise with power spectral density of N o watts/Hz.  ... 
doi:10.1109/tits.2011.2182193 fatcat:n5rtluuz45b3nntrjrwme3r7i4

Comparative assessment of orthogonal and nonorthogonal multiplexing techniques for differentiated satellite broadcasting services

Farbod Kayhan, Guido Montorsi, Giorgio Taricco, Nader Alagha
2015 2015 IEEE Symposium on Communications and Vehicular Technology in the Benelux (SCVT)  
requirements for broadcasting the same content.  ...  In this scenario, the conventional additive white Gaussian noise (AWGN) channel with average power limitation is no longer an accurate model and nonlinear characteristics have to be taken into account.  ...  In particular, for degraded AWGN broadcast channel, the superposition provides the maximum achievable rate [2] .  ... 
doi:10.1109/scvt.2015.7374227 dblp:conf/scvt/KayhanMTA15 fatcat:er766ujlhvg3dnpkh37cvkf344

Joint Source-Channel Coding for Quasi-Static Fading Channels with Quantized Feedback

Farzad Etemadi, Hamid Jafarkhani
2007 2007 IEEE International Symposium on Information Theory  
the number of the layers in the superposition coding scheme.  ...  We show that the distortion exponent of limited feedback is equivalent to that of superposition coding without feedback, so long as the number of quantization levels in the feedback scheme is equal to  ...  The case of a SIMO channel is similar and does not introduce additional insight. Performance results without feedback are based on superposition coding with N layers [6] .  ... 
doi:10.1109/isit.2007.4557553 dblp:conf/isit/EtemadiJ07 fatcat:jpupzvoj3zbelaok2isivavpuq
« Previous Showing results 1 — 15 out of 1,957 results