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On the Energy Efficiency–Spectral Efficiency Tradeoff in Random Beamforming
IEEE Wireless Communications Letters, 2014Energy efficiency (EE) and spectral efficiency (SE) are among the most important metrics in wireless systems. The relationship between EE and SE has attracted more attention recently. In this letter, we derive a closed-form approximation of the EE–SE tradeoff in a multi-antenna random beamforming system under a realistic power consumption model.
Yi Huang, Ling Qiu
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Spectral efficiency of CDMA with random spreading
IEEE Transactions on Information Theory, 1999Summary: The CDMA channel with randomly and independently chosen spreading sequences accurately models the situation where pseudonoise sequences span many symbol periods. Furthermore, its analysis provides a comparison baseline for CDMA channels with deterministic signature waveforms spanning one symbol period. We analyze the spectral efficiency (total
Sergio Verdú, Shlomo Shamai
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Energy-Efficient and Spectrally-Efficient MIMO
2021While enabling energy efficiency and spectral efficiency, MIMO systems tends to be associated to an exponential increase of complexity and of signal processing, with the increase of the number of transmit and receive antennas. As described in this article, a reduction of complexity can be obtained with the use of the two proposed algorithms: Maximum ...
Silva, Mário Marques da +2 more
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Spectrally Efficient 1Tb/s Transceivers
Optical Fiber Communication Conference, 2015Based on recent Terabit-class transmission experiment, we discuss the design of 1Tb/s transceivers for long-haul optical systems involving complex tradeoffs between constellation complexity, opto-electronics bandwidth limitations, ROADM cascade, advanced FEC…
Jérémie Renaudier +3 more
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Downlink Spectral Efficiency of Mobile WiMAX
2007 IEEE 65th Vehicular Technology Conference - VTC2007-Spring, 2007Mobile WiMAX is an OFDMA (orthogonal frequency division multiple access) mobile broadband air interface defined by the IEEE 802.16 family of standards and promoted by the WiMAX Forum as a solution to the requirements for mobile Internet services.
Roshni Srinivasan +3 more
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Precoded Spectrally Efficient FDM system
21st Annual IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, 2010Spectrally Efficient Frequency Division Multiplexing (SEFDM) system proposes enhanced spectrum utilization in contrast to Orthogonal Frequency Division Multiplexing system (OFDM). Spectral efficiency is increased by relaxing the orthogonality condition while maintaining the same transmission rate per individual channel, hence, for the same bandwidth ...
Safa Isam, Izzat Darwazeh
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Spectral luminous efficiency as a function of age
Journal of the Optical Society of America A, 2001Spectral luminous efficiency function for a 2-deg field at a photopic level (100 Td) was measured for 91 observers by flicker photometry (FP) and for 97 observers by direct brightness matching (DBM), to find age-related change in the efficiency function as well as to obtain a reliable data set to be used in photometry.
K, Sagawa, Y, Takahashi
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Spectral Efficiency Considerations
1997At the end of the day, whatever cellular radio system is considered, the following two factors will have to be taken into account: (i) The number of subscribers that can be connected to the system in an acceptable way for the radio spectrum allocated within a state or country desiring a cellular telephone service and (ii) the
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Spectral efficiency of multiple access techniques
Proceedings of IEEE Vehicular Technology Conference (VTC), 2002The terms modulation and multiple access are used to define two entirely different matters and hence the efficiency they contribute is separable. In theory, all multiple access techniques potentially have 100% relative spectral efficiency provided that the channels are orthogonal.
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