Essentials of LTE and LTE-A

Ghosh, A.; Ratasuk, Rapeepat

doi:10.1017/cbo9780511997082

Cited by 132 publications

(48 citation statements)

References 25 publications

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“…In LTE, OFDMA radio access technology is chosen for downlink data transmission in which the available system bandwidth is split into parallel narrow-band orthogonal sub-carriers with subcarrier spacing of 15 kHz irrespective of total bandwidth [3,8]. Radio resources are defined in time-frequency domain (shown in Fig.…”

Section: Packet Scheduling In Lte Downlinkmentioning

confidence: 99%

Comparative Analysis of Downlink Packet Scheduling Algorithms in 3GPP LTE Networks

Afroz¹,

Heidari²,

Shehab³

et al. 2015

IJWMN

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Section: Packet Scheduling In Lte Downlinkmentioning

confidence: 99%

Comparative Analysis of Downlink Packet Scheduling Algorithms in 3GPP LTE Networks

Afroz¹,

Heidari²,

Shehab³

et al. 2015

IJWMN

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“…For each sounding region up to eight UEs can be multiplexed via cyclic shifts, n SRS . Based on this, both FDM and CDM allows to multiplex a total of 16 UEs in the same spectrum area; such number of UEs is not feasible since there are orthogonality and interference issues, so a more realistic estimate is to multiplex 6 to 8 UEs [8].…”

Section: Cqi In the Uplinkmentioning

confidence: 99%

Interference coordination method for CSI improvement in LTE uplink with Carrier Aggregation

Lema

García-Lozano

Ruíz

2015

2015 European Conference on Networks and Communications (EuCNC)

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Abstract-Carrier Aggregation is an important feature in Long Term Evolution Advanced (LTE-A). It allows operators to provide larger operational bandwidths without the need of having a contiguous, large piece of spectrum. However, an increased bandwidth also needs a larger channel sounding to obtain channel state information (CSI), required for frequency domain scheduling and link adaptation. This constitutes a serious challenge for the uplink since wideband sounding reference signals cannot be transmitted by cell edge (power limited) users and hopped sounding requires a long time to sweep the entire transmission band, thus leading to outdated and less reliable CSI. Also, average interference and its variation in time can seriously jeopardize the CSI at the eNodeB. In this paper, we present an integration of inter cell interference coordination with CSI reporting by reducing the interference variability through controlled allocations. Results show that the entire CSI accuracy can be improved and so does the overall cell performance.

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“…Note that the structure of BICMB-OFDM with subcarrier grouping in Fig. 3 can also be considered as Orthogonal Frequency-Division Multiple Access (OFDMA) [39] version of BICMB-OFDM. OFDMA is a multi-user version of the OFDM and it has been used in the mobility mode of WiMAX [17] as well as the downlink of LTE [18].…”

Section: Negative Effect Of Subcarrier Correlationmentioning

confidence: 99%

Diversity Analysis of Bit-Interleaved Coded Multiple Beamforming with Orthogonal Frequency Division Multiplexing

Ayanoğlu

2013

IEEE Trans. Commun.

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For broadband wireless communication systems, Orthogonal Frequency Division Multiplexing (OFDM) has been combined with Multi-Input Multi-Output (MIMO) techniques. Bit-Interleaved Coded Multiple Beamforming (BICMB) can achieve both spatial diversity and spatial multiplexing for flat fading MIMO channels. For frequency selective fading MIMO channels, BICMB with OFDM (BICMB-OFDM) can be applied to achieve both spatial diversity and multipath diversity, making it an important technique. However, analyzing the diversity of BICMB-OFDM is a challenging problem. In this paper, the diversity analysis of BICMB-OFDM is carried out. First, the maximum achievable diversity is derived and a full diversity condition R c SL ≤ 1 is proved, where R c , S, and L are the code rate, the number of parallel steams transmitted at each subcarrier, and the number of channel taps, respectively. Then, the performance degradation due to the correlation among subcarriers is investigated. Finally, the subcarrier grouping technique is employed to combat the performance degradation and provide multi-user compatibility.

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Essentials of LTE and LTE-A

Cited by 132 publications

References 25 publications

Comparative Analysis of Downlink Packet Scheduling Algorithms in 3GPP LTE Networks

Comparative Analysis of Downlink Packet Scheduling Algorithms in 3GPP LTE Networks

Interference coordination method for CSI improvement in LTE uplink with Carrier Aggregation

Diversity Analysis of Bit-Interleaved Coded Multiple Beamforming with Orthogonal Frequency Division Multiplexing

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