Results 221 to 230 of about 4,340,123 (267)
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A hybrid access method in a multiple access channel
Performance Evaluation, 1986Abstract This paper considers a multiple-access communication channel with an infinite number of users. We show that if a controlled slotted Aloha protocol is used, then messages with variable length will have a negative impact on the average message delay.
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On Simple Multiple Access Networks
IEEE Journal on Selected Areas in Communications, 2015We investigate a simple multiple access network (SMAN) where $k$ independent sources of unit rates multicast their information to a set of sinks, via $n$ commonly shared relays. All links are assumed to have unit capacity. Given such a SMAN, a coding scheme for the relays is called optimal if each sink can retrieve all information from the ...
Son Hoang Dau, Wentu Song, Chau Yuen
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2013 IEEE 24th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC), 2013
Multicarrier CDMA is a multiplexing approach in which modulated QAM symbols are spread over multiple OFDMA tones by using a generally complex spreading sequence. Effectively, a QAM symbol is repeated over multiple tones. Low density signature (LDS) is a version of CDMA with low density spreading sequence allowing us to take advantage of a near optimal ...
Hosein Nikopour, Hadi Baligh
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Multicarrier CDMA is a multiplexing approach in which modulated QAM symbols are spread over multiple OFDMA tones by using a generally complex spreading sequence. Effectively, a QAM symbol is repeated over multiple tones. Low density signature (LDS) is a version of CDMA with low density spreading sequence allowing us to take advantage of a near optimal ...
Hosein Nikopour, Hadi Baligh
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Satellite multiple access protocols
IEEE Communications Magazine, 1980This paper presents a tutorial on the varioupsr otocols used in satellite data transmission. The most important characteristic of the satellite system is the ability of the earth stations, located at geographically dispersed areas, to access the satellite to transmit and to receive data.
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The Interference-Multiple-Access Channel
2009 IEEE International Conference on Communications, 2009We introduce the interference-multiple-access channel, which is a discrete memoryless channel with two transmitters and two receivers, similar to the interference channel. One receiver is required to decode the information encoded at one transmitter, the other receiver is required to decode the messages from both transmitters. We provide an inner bound
Perron, Etienne +2 more
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On the capacity of multiplicative multiple access channels with AWGN
2011 IEEE Information Theory Workshop, 2011We consider a multiplicative multiple access channel in the presence of additive white Gaussian noise. Under individual average power constraints at each of the transmitters, we characterize the capacity region of this channel. The structure of the region reveals some fundamental characteristics related to timesharing, power constraints and the ...
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Proceedings of the November 12-14, 1963, fall joint computer conference on XX - AFIPS '63 (Fall), 1963
During the past two years disc files have been accepted as a reliable and economic form of mass random-access memory. It is now possible to design disc file systems which are functionally and logically optimized to provide efficient operation for a wide range of applications.
Irving L. Wieselman +2 more
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During the past two years disc files have been accepted as a reliable and economic form of mass random-access memory. It is now possible to design disc file systems which are functionally and logically optimized to provide efficient operation for a wide range of applications.
Irving L. Wieselman +2 more
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Multiple access computational offloading
2016 IEEE 17th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC), 2016Mobile cloud computing provides shared computational resources to which mobile devices can offload computational tasks in order to reduce energy consumption or reduce the latency of the task execution. The decision of whether or not to offload a task can be formulated as a joint optimization problem over the available computational and radio resources.
Mahsa Salmani, Timothy N. Davidson
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Multiple access modulation techniques
Communications Satellite Systems Conference, 1966Abstract This paper quantitatively and qualitatively compares the following multiple-access satellite communication techniques: frequency-division multiple access (FDMA), time-division multiple access (TDMA), spread-spectrum multiple access (SSMA), and pulse-address multiple access (PAMA).
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Scrambled Coded Multiple Access
2011 IEEE Vehicular Technology Conference (VTC Fall), 2011The advantages of Interleave Division Multiple Access (IDMA) are taken one step further by Scrambled Coded Multiple Access (SCMA) where user specific, long interleave tables are replaced by a common scrambling sequence that can be used for all users with a simple shift.
Mustafa Eroz, Lin-Nan Lee
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