Angular beamforming technique for MIMO beamforming system

Innok, Apinya; Uthansakul, Peerapong; Uthansakul, Monthippa

doi:10.1109/ecticon.2012.6254172

Cited by 5 publications

(5 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…When combined with precoding, the preocder weights are multiplied by these symbols and equivalently received in the receiver. Conventional transmit precoding, for instance angular beamforming dierentiates among these symbols by assigning dierent phases to each transmit symbol block [9]. If these possibilities and dierentiations already exist among the symbols (e.g.…”

Section: Introductionmentioning

confidence: 99%

Precoding of Correlated Symbols for STBC Systems Design

Anoh

Adebisi

Okorafor

2017

Wireless and Satellite Systems

View full text Add to dashboard Cite

A problem with transmitting correlated symbols over multiple transmit channel paths is that there is no diversity gain achieved at the receiver. Precoding technique provides a smart approach to achieving diversity gains at the receiver even when correlated symbols are transmitted; by phase variation, amplitude variation or both provided by the precoder. The space-time block code (STBC) technique, for example, is well-known when transmitting the same symbols by making them appear as dierent symbols using conjugation. We observe that correlated symbols can be transmitted over multiple transmit channel paths over STBC scheme while still achieving diversity. The correlated symbols can be made to appear as dierent symbols by using precoders; this enables diversity and improves data rate. Combining the proposed with the equivalent channel matrix (EVCM) permits the proposed design to outperform the conventional precoding of uncorrelated symbols technique by 2dB at all bit error ratio (BER) for and antenna congurations. This is useful in increasing data rates with better BER performance.

show abstract

Section: Introductionmentioning

confidence: 99%

Precoding of Correlated Symbols for STBC Systems Design

Anoh

Adebisi

Okorafor

2017

Wireless and Satellite Systems

View full text Add to dashboard Cite

show abstract

“…This requirement is not practical due to the limited battery lifetime of nodes. To tackle the problem, array antennas may be employed at individual devices in order to enhance beamforming gain [2][3][4][5][6][7]. Unfortunately, the installation of multiple antennas on a mobile terminal is difficult due to its size and the limitation of power consumption [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Nonfeedback Distributed Beamforming Using Spatial-Temporal Extraction

Sriploy¹,

Uthansakul

2016

International Journal of Antennas and Propagation

View full text Add to dashboard Cite

So far, major phase synchronization techniques for distributed beamforming suffer from the problem related to the feedback procedure as a base station has to send the feedback reference signal back to the transmitting nodes. This requires stability of communication channel or a number of retransmissions, introducing a complicated system to both transmitter and receiver. Therefore, this paper proposes an alternative technique, so-called nonfeedback beamforming, employing an operation in both space and time domains. The proposed technique is to extract a combined signal at the base station. The concept of extraction is based on solving a simultaneous linear equation without the requirement of feedback or reference signals from base station. Also, the number of retransmissions is less compared with the ones available in literatures. As a result, the transmitting nodes are of low complexity and also low power consumption. The simulation and experimental results reveal that the proposed technique provides the optimum beamforming gain. Furthermore, it can reduce Bit Error Rate to the systems.

show abstract

“…Another major element of any 5G cellular system will be that of multiple antennas. Using these it will be possible to alter the beam direction to enable more direct communications and limit interference and increase overall cell capacity [2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Performance analysis of MB-MIMO under 120 degree sector consideration for 5G communications

Narongrit

Uthansakul

2014

The 20th Asia-Pacific Conference on Communication (APCC2014)

View full text Add to dashboard Cite

The use of multiple antennas is another major element of any 5G cellular system because it will be possible to alter the beam direction to enable more direct communications and limit interference and increase overall cell capacity. Among techniques in the area of multiple antennas, MB-MIMO (Multi beam-Multiple Input Multiple Output) technique gains a lot of attention due to the performance improvement with the possibility of real implementation. However, in literature, the consideration of MB-MIMO technique does not concern the 120 degree sector. Even in 5G cellular, the practical installation of base station might still be 120 degree sector. Hence, this paper presents the performance analysis of MB-MIMO under 120 degree sector considerations. The simulation results indicate the interesting issue on number of optimum beams for MB-MIMO that the 120 degree sector considerations requires less beams than conventional cell. This can lead to the real implementation for 5G technology in the near future.

show abstract

Angular beamforming technique for MIMO beamforming system

Cited by 5 publications

References 4 publications

Precoding of Correlated Symbols for STBC Systems Design

Precoding of Correlated Symbols for STBC Systems Design

Nonfeedback Distributed Beamforming Using Spatial-Temporal Extraction

Performance analysis of MB-MIMO under 120 degree sector consideration for 5G communications

Contact Info

Product

Resources

About