A Transmitter Model for Performance Improvement and Interference Mitigation of Multi-user STBC-CDMA System in Correlated MISO Channels

Rahmati, Mehdi; Vakili, Vahid Tabataba

doi:10.1109/ems.2009.91

Cited by 5 publications

(3 citation statements)

References 13 publications

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“…One part is desired signals where i = k, and the rest part represents IUI. Herein, the details of the communication process can be described in time domain [29] as follows.…”

Section: System Modelmentioning

confidence: 99%

Retrospective Interference Regeneration Schemes for Relay-Aided K-user MIMO Downlink Networks

Li¹,

Xiong²,

Niyato³

et al. 2021

Preprint

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As a novel method to increase channel capacity of networks, interference alignment (IA) technique has attracted wide attention in fifth-generation wireless networks (5G). However, when it is applied in interference networks, the problem about information delay arises which has not been noticed yet. In this paper, we first propose degree of delay (DoD) to quantify the issue of information delay, and characterize DoD for three typical transmission schemes, i.e., TDMA, beamforming based TDMA (BD-TDMA) and retrospective interference alignment (RIA). By analyzing DoD of these schemes, its value mainly depends on three factors, i.e., delay sensitive factor, queueing delay slot and size of dataset. Therefore, to improve queueing delay slot and reduce DoD, three novel joint IA schemes are proposed for BC networks with different amounts of users. That is, hybrid antenna array based partial interference elimination and retrospective interference regeneration scheme (HAA-PIE-RIR), HAA based improved PIE and RIR scheme (HAA-IPIE-RIR) and HAA based cyclic interference elimination and RIR scheme (HAA-CIE-RIR). The second scheme extends the application scenarios of the first scheme from 2-user to K-user while brings huge computational burden. The third scheme relieves this computational complexity burden but it has somewhat degree of freedom (DoF) loss. Overall, the performances of proposed schemes are all superior to that of traditional IA techniques in DoF and DoD.Index Terms-multi-user MIMO broadcast networks, degree of freedom, degree of delay, hybrid antenna array structure of relay, interference elimination and retrospective interference regeneration.

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“…One part is desired signals where i = k, and the rest part represents IUI. Herein, the details of the communication process can be described in time domain [29] as follows.…”

Section: System Modelmentioning

confidence: 99%

Retrospective Interference Regeneration Schemes for Relay-Aided K-user MIMO Downlink Networks

Li¹,

Xiong²,

Niyato³

et al. 2021

Preprint

View full text Add to dashboard Cite

show abstract

“…Specifically, the component of the CSI should be expanded into two parts, the channel gain information and the angel information. Thus, the system model should be described in time domain [31] and angular domain [32], as that presented in the section II.A and II.B, respectively. Meanwhile, based on the relationship between the coherent time and the time delay, the types of the CSI should be classified into three categories, the instantaneous CSI, the moderate delayed CSI and the delayed CSI.…”

Section: System Modelmentioning

confidence: 99%

“…To acquire the channel gain information of CSI, the system model mentioned above should be described as the time domain model [31]. Taking the transmission of one slot t, ∀t ∈ T as example, the base station i transmits messages S i,k [t] to the user k in the cell i.…”

Section: A Time Domain Modelmentioning

confidence: 99%

Two New Kinds of Interference Alignment Schemes for Cellular K-user MIMO Downlink Networks

Li¹,

Wang²,

Yu³

et al. 2021

Preprint

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It is known that interference alignment (IA) plays an important role in improving the degree of freedom (DoF) of multi-input and multi-output (MIMO) systems. However, most of the traditional IA schemes suffer from the high computational complexity and require the global and instantaneous channel state information (CSI), both of which make them difficult to be extended to cellular MIMO systems. To handle these issues, two new interference alignment schemes, i.e., the retrospective interference regeneration (RIR) scheme and the beamforming based distributed retrospective interference alignment (B-DRIA) scheme, are proposed for cellular K-user MIMO downlink networks. For the RIR scheme, it adopts interference elimination algorithm to erase redundant symbols in inter-cell interference (ICI) signals, and then uses interference regeneration algorithm to avoid secondary interference. The RIR scheme obtains greater DoF gain than the retrospective interference alignment (RIA) scheme, but incurs performance degradation when the transceiver antennas ratio (TAR) approaches 1. Therefore, the B-DRIA scheme is further proposed. For the B-DRIA scheme, the cellular beamforming matrix is introduced to eliminate the ICI, and meanwhile distributed retrospective interference alignment algorithm is adopted to align inter-user interference (IUI). The simulation results show that the B-DRIA scheme obtains larger DoF than the RIR scheme locally. Specifically, when TAR approaches 1, two schemes obtain the same DoF. While TAR approaches 2, the DoF of the B-DRIA scheme is superior than the RIR scheme.

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Retrospective Interference Regeneration Schemes for Relay-Aided K-user MIMO Broadcast Networks

Xiong

Wang

et al. 2022

ICC 2022 - IEEE International Conference on Communications

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A Transmitter Model for Performance Improvement and Interference Mitigation of Multi-user STBC-CDMA System in Correlated MISO Channels

Cited by 5 publications

References 13 publications

Retrospective Interference Regeneration Schemes for Relay-Aided K-user MIMO Downlink Networks

Retrospective Interference Regeneration Schemes for Relay-Aided K-user MIMO Downlink Networks

Two New Kinds of Interference Alignment Schemes for Cellular K-user MIMO Downlink Networks

Retrospective Interference Regeneration Schemes for Relay-Aided K-user MIMO Broadcast Networks

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