... 27 2.3.3 ** Energy-** efficiency metric 29 2.4 ** Antenna ** ** selection ** ** for ** ** MIMO-** ** OFDM ** ** wireless ** ** systems ** 30 2.4.1 ** Antenna ** ** selection ** 31 2.4.2 ** Antenna ** ** selection ** ** for ** ** OFDM ** ** systems ** ... ** for ** ** MIMO-** ** OFDM ** ** systems ** 2.4 ** Antenna ** ** Selection ** ** for ** ** MIMO-** ** OFDM ** ** Wireless ** ** Systems ** In this section, ** antenna ** ** selection ** ** MIMO ** techniques are introduced At first, several important aspects in ** antenna ** ** selection ** ... investigates ** antenna ** ** selection ** strategies ** for ** ** MIMO-** ** OFDM ** ** wireless ** ** systems ** from an ** energy ** efficiency perspective Closed-form expressions of ** energy ** efficiency in ** MIMO-** ** OFDM ** ** systems ** that deploy conventional antenna...

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... power consumption ** and ** costs of the conventional MIMO approaches [1] limit applications ** for ** ubiquitous networks A low-power ** and ** low-cost ** RF-MIMO ** (MIMAX) system ** for ** maximum reliability ** and ** performance ... possible to perform all relevant control ** and ** configuration commands ** for ** every station The ** baseband ** board was used ** for ** the real-time tests of the MIMAX ** baseband ** processor in several setups First, ... MAC functions is described in Section The ** baseband ** architecture is presented in Section Functional modules of the ** baseband ** processor are described in Sections 5, ** and ** The implementation details...

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... power consumption ** and ** costs of the conventional MIMO approaches [1] limit applications ** for ** ubiquitous networks A low-power ** and ** low-cost ** RF-MIMO ** (MIMAX) system ** for ** maximum reliability ** and ** performance ... possible to perform all relevant control ** and ** configuration commands ** for ** every station The ** baseband ** board was used ** for ** the real-time tests of the MIMAX ** baseband ** processor in several setups First, ... the stability ** and ** robustness of the ** MAC ** ** and ** ** baseband ** ** processors,** as well as the ** WLAN ** driver software in real-time conditions Moreover, the signal quality (constellation diagram) ** and ** data throughput...

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... ** Recursive ** ** analytical ** ** performance ** ** evaluation ** ** of ** ** broadcast ** ** protocols ** ** with ** ** silencing: ** ** application ** ** to ** ** VANETs ** Stefano Busanelli∗ , Gianluigi Ferrari ** and ** Roberto Gruppini Department ** of ** Information ... ** performance ** ** of ** the novel probabilistic ** broadcast ** ** protocols ** is investigated ** and ** compared ** with ** that ** of ** other (known) ** protocols ** Finally, Section concludes the article 2.1 Multihop ** broadcast ** ** protocols ** ... a function ** of ** ρs z, in Figure 8a, ** and ** the following considerations can be drawn: (i) g ∗ is an increasing monotonic function ** of ** ρs z; (ii) ** with ** the exception ** of ** the region in proximity ** to ** ρs z...

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... Wunder et al.: ** Precoding ** ** and ** ** Transmitter-Side ** ** processing ** ** techniques ** ** for ** ** multiuser ** ** MIMO ** ** OFDM ** ** systems ** ** with ** ** special ** ** emphasis ** ** on ** ** the ** ** PAPR ** problem EURASIP Journal ** on ** Advances in Signal ** Processing ** 2011 ... combined ** with ** basis selection algorithm ** for ** ** PAPR ** reduction Similarly, in ** the ** ** multiuser ** ** MIMO ** ** OFDM ** uplink ** with ** DFT pre-coding, ** the ** joint problem of maximum throughput ** and ** ** PAPR ** reduction is tackled in ** the ** ... fundamental bounds ** on ** ** the ** potential gains due to coding ** for ** ** the ** ** PAPR ** problem ** The ** analysis of an alternative metric instead of ** PAPR ** is ** the ** topic of ** the ** paper **On ** ** the ** EVM Computation of Arbitrary...

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... the rank ** of ** R−1 increases ** with ** ˜ the number ** of ** receive antennas, the number ** of ** pilot OFDM symbols as well as the number ** of ** ** pilots ** within the OFDM symbol, but decreases ** with ** the number ** of ** transmit ... but only ** for ** time-invariant ** channels ** or systems ** for ** which the time variation ** of ** the channel within one OFDM symbol can be neglected Except ** for ** [7,11], much less attention has been paid to systems ... R−1 also increases ** with ** the ˜ number ** of ** pilot OFDM symbols Comparing Figure ** with ** 3, we can indeed observe a performance improvement However, ** for ** faster fading ** channels,** multiple OFDM symbols work...

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... FFT ** processors ** and aim to oﬀer an FFT ** IP ** generator that has the capability ** of ** ** automatic ** wordlength ** optimization ** to achieve hardware eﬃciency The ** IP ** generator can generate the hardware description ... used in advanced systems ** With ** our proposed architecture, the advantage is twofold On one hand, the same control ﬂow as the one needed ** for ** ** generation ** ** of ** multiple-channel FFT ** processors ** can be shared ... number ** of ** **ip-** ﬂops is related ** with ** the pipeline registers and short delay buﬀers, while the number ** of ** slices reﬂects the logic complexity including distributed RAMs ** for ** long delay buﬀers and ROMs for...

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... SISO-OFDM The BER is degraded due to the ** frequency ** oﬀset ** and ** ** channel ** ** estimation ** errors For a ﬁxed ** channel ** ** estimation ** variance ** error ** σΔH , a larger variance ** of ** ** frequency ** oﬀset ** estimation ** ** error,** ... 1025– 1030, 2009 [32] Z Zhang, W Zhang, ** and ** C Tellambura, “BER ** of ** MIMOOFDM ** systems ** ** with ** ** carrier ** ** frequency ** oﬀset ** and ** ** channel ** ** estimation ** errors,” in Proceedings ** of ** IEEE International Conference on ... function ** of ** the second-order statistics ** of ** the ** channel ** ** and ** ** frequency ** oﬀset ** estimation ** errors (although the interference also comprises the fourth-order statistics ** of ** the ** frequency ** oﬀset ** estimation ** errors,...

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... ** Recursive ** ** analytical ** ** performance ** ** evaluation ** ** of ** ** broadcast ** ** protocols ** ** with ** ** silencing: ** ** application ** ** to ** ** VANETs ** Stefano Busanelli∗ , Gianluigi Ferrari ** and ** Roberto Gruppini Department ** of ** Information ... ** performance ** ** of ** the novel probabilistic ** broadcast ** ** protocols ** is investigated ** and ** compared ** with ** that ** of ** other (known) ** protocols ** Finally, Section concludes the article 2.1 Multihop ** broadcast ** ** protocols ** ... a function ** of ** ρs z, in Figure 8a, ** and ** the following considerations can be drawn: (i) g ∗ is an increasing monotonic function ** of ** ρs z; (ii) ** with ** the exception ** of ** the region in proximity ** to ** ρs z...

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... ** MIMO-OFDM ** subsystem ** For ** a multiuser scenario, each user can be allocated one or more ** MIMO-OFDM ** subsystems depending on the ** system ** complexity and requirement The ** block ** diagram of a ** MIMO-OFDM ** ** system ** ... ** MIMO-OFDM ** ** system ** typically is partitioned into Ns ** MIMO-OFDM ** subsystems where Ns ≥ It is pointed out in [28] that the MIMOOFDM ** system ** capacity ** with ** grouping can approach the channel capacity without ... 40 20 Figure 6: Performance of the rate one MRP and the SFBC in [12] ** for ** the ** MIMO-OFDM ** ** system ** ** with ** Nt = 2, Nr = 1, Nc = 512, and δ = 128 in the propagation scenario ** with ** uniform PDP of two paths...

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... schemes ** and ** describes the proposed modiﬁcation for bit-loaded VBLAST Section presents the simulation results, ** and ** ﬁnally conclusions are drawn in Section The OFDM system under consideration is ... transposition) Denoting xk the NT -dimensional vector transmitted over NT antennas ** and ** subcarrier k, ≤ k < N, ** and ** assuming standard OFDM transmission ** and ** reception, the corresponding NR dimensional ... communications,” in Proceedings of the 6th IEE International Conference ** on ** 3G ** and ** Beyond, pp 9–12, London, UK, November 2005 [10] R Zhang ** and ** J M Cioﬃ, “CTH03-6: approaching MIMOOFDM capacity with...

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... Therefore, a1 and −a∗ are transmitted from the ﬁrst transmit ** an2** tenna, and a2 and a∗ are transmitted from the second trans1 mit antenna during the ﬁrst and second transmission periods, respectively ... channel gains corresponding to two transmit antennas ** with ** h1 and h2 , respectively Let the dummy symbols to be transmitted during the ﬁrst two transmission periods be a1 and a2 Therefore, a1 and ... technique ** with ** CIOD is not possible due to nonconstant modulus of ** coordinate ** interleaved signal constellation Let us assume a quasistatic fading channel ** with ** two transmit and one receive antennas, and...

- 8
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... ratio (SNR), the normalized instantaneous channel response H, and the multiantenna encoding The instantaneous capacity can be easily derived ** for ** the diﬀerent multiantenna encoding Practically, ... the (ﬂat) chan11 nel response between the single active transmit antenna and the single active receive antenna ** for ** the subcarrier n (including transmit and receive ﬁlters) The instantaneous capacity ... channel can be reduced to equivalent SISO channel corresponding to the quadratic average of the subchannels between each pairs of transmit and receive antennas [3] The instantaneous capacity can...

- 15
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... Therefore, a1 and −a∗ are transmitted from the ﬁrst transmit ** an2** tenna, and a2 and a∗ are transmitted from the second trans1 mit antenna during the ﬁrst and second transmission periods, respectively ... channel gains corresponding to two transmit antennas ** with ** h1 and h2 , respectively Let the dummy symbols to be transmitted during the ﬁrst two transmission periods be a1 and a2 Therefore, a1 and ... technique ** with ** CIOD is not possible due to nonconstant modulus of ** coordinate ** interleaved signal constellation Let us assume a quasistatic fading channel ** with ** two transmit and one receive antennas, and...

- 8
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... comprising a ** source ** node ** with ** LM transmit antennas, a ** relay ** node ** with ** KN antennas, ** and ** a ** destination ** node ** with ** LM antennas In this case, the power constraints at the ** source ** ** and ** ** relay ** are LP ** and ** KP, ... k (3) ** MIMO ** ** RELAY ** ** TECHNIQUES ** In this paper, we assume that each ** relay ** node knows the CSI of its own backward ** and ** forward channels However, we not allow ** source ** nodes, ** relay ** nodes, ** and ** ** destination ** ... interests cover the ** wireless ** network systems, ** relay ** ** networks,** ** multiple-** input ** and ** ** multiple-** output **(MIMO)** transmission, ** and ** information theory issues He is a Member of IEEE ** and ** IEICE Takahiro Asai...

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