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Multiple antenna systems

Xem 1-20 trên 37 kết quả Multiple antenna systems
  • This thesis presents a study of impedance optimisation of active microstrip patch antennas to multiple frequency points. A single layered aperture coupled microstrip patch antenna has been optimised to match the source reflection coefficient of a transistor in designing an active antenna. The active aperture coupled microstrip patch antenna was optimised to satisfy Global Positioning System (GPS) frequency specifications.

    pdf137p runthenight05 01-03-2023 4 2   Download

  • In this paper, we investigate the physical layer secrecy performance of multiple-input multiple-output (MIMO) system with transmission antenna selection (TAS) and receiver maximal-ratio combining (MRC) in the presence of a single antenna passive eavesdropper over dissimilar fading channels.

    pdf5p vijaguar 16-11-2022 9 1   Download

  • In this paper, we propose a reliable communication solution using space-time diversity technique but using only one transceiver antenna applied to mobile OFDM system in underwater communication environment. In our solution, instead of using multiple receive antennas, the transmitter transmits an OFDM signal N times consecutively.

    pdf9p vispyker 14-11-2022 10 4   Download

  • Massive multiple-input multiple-output (m-MIMO) is used to improve the robustness of data transmission and high sum spectral efficiency in 5G systems. For 5G New Radio (NR) systems need to be designed to reduce cost and complexity, most notably hybrid analog-digital beamforming with large-scale antenna array which has become a major research target.

    pdf8p vimelindagates 18-07-2022 15 4   Download

  • In this paper, we propose a novel algorithm to optimize the weighted total system rate (WSR) for a broadcast communication system using multiple input-multiple output (MIMO) antenna technology based on the Harris Hawking Optimization (HHO) algorithm, called Algorithm 1, using the Minimum Mean Square Error (MMSE) filter at the mobile stations (MS).

    pdf8p vigeneralmotors 13-07-2022 32 6   Download

  • Bài viết đề xuất phương pháp lựa chọn cặp anten thu-phát tối ưu trong mạng MIMO vô tuyến nhận thức dạng nền (Multiple Input Multiple Output underlay cognitive radio) kết hợp kỹ thuật lựa chọn anten phát TAS (Transmit Antenna Selection) ở nút nguồn và kỹ thuật kết hợp chọn lựa SC (Selection Combining) ở nút đích dưới sự tác động của phần cứng không hoàn hảo. Hiệu năng của hệ thống khảo sát được đánh giá thông qua tham số xác suất dừng của hệ thống thứ cấp (secondary system) hoạt động trên kênh truyền fading Rayleigh.

    pdf5p wangziyi_1307 26-04-2022 29 3   Download

  • Orthogonal frequency division multiplexing (OFDM) has become a prevalent and widespread technique for the broadcast and transmission of signals over wireless channels and has been adopted in many wireless standards. OFDM may be united with antenna arrays at the transmitter and receiver side to improve the diversity gain and to improve the system competence on time-variant along with the frequency-selective channels, resulting in a multiple-input multiple-output (MIMO) composition.

    pdf4p son248 24-03-2020 30 1   Download

  • Multiple-input multiple-output (MIMO) millimeter wave (mmWave) systems are vulnerable to hardware impairments due to operating at high frequencies and employing a large number of radiofrequency (RF) hardware components. In particular, nonlinear power amplifiers (PAs) employed at the transmitter distort the signal when operated close to saturation due to energy efficiency considerations. In this paper, we study the performance of a MIMO mmWave hybrid beamforming scheme in the presence of nonlinear PAs.

    pdf33p son248 24-03-2020 32 1   Download

  • This paper introduces a principal concept of MIMO bit division and presents its performance with corresponding simulation results. When multiple antenna technique is applied to enhance the spectral efficiency, the original data stream should be divided in a proper way. We found that the way of dividing original data stream, if it is not cooperating well with the originally structured system, may lead to performance degradation. The key idea is dividing the original data bit stream without causing an undesired change of bit order at the output of bit-to-cell demux.

    pdf4p son248 24-03-2020 14 0   Download

  • This paper proposes a novel Large-scale (massive) Multi-input Multi-output Multicarrier Code division multiple access (LS MIMO MC-CDMA) model and application to the Fifth-Generation Mobile Communication Systems (5G). This system uses combined cylindrical array antenna multiple beamforming architecture with spatial multiplexing. The model is optimized by Min-Max criteria in order to minimize side lobes and maximize the reduction of propagation loss. The Monte Carlo simulation results unify with the analytical solution for system performance.

    pdf11p son248 24-03-2020 20 0   Download

  • Multi-cell wireless systems usually suffer both intracell and inter-cell interference, which can be mitigated via coordinated multipoint (CoMP) techniques. Previous works on multi-cell analysis for the microwave band generally consider fully digital beamforming that requires a complete radio-frequency chain behind each antenna, which is less practical for millimeterwave (mmWave) systems where large amounts of antennas are necessary to provide sufficient beamforming gain and to enable transmission and reception of multiple data streams per user.

    pdf8p son248 24-03-2020 41 0   Download

  • Millimeter wave (mmWave) and massive multiple-input multiple-output communications (massive MIMO) have been adopted as the most important keys for the next generation (5G) wireless networks due to high spectrum availability and massive use of space diversity for high throughput communications. Massive MIMO must be implemented parallel with mmWave to overcome high path-loss issue in mmWave band by improving the antennas gain.

    pdf16p son248 24-03-2020 26 0   Download

  • The potential of using of millimeter wave (mmWave) frequency for future wireless cellular communication systems has motivated the study of large-scale antenna arrays for achieving highly directional beamforming. However, the conventional fully digital beamforming methods which require one radio frequency (RF) chain per antenna element is not viable for large-scale antenna arrays due to the high cost and high power consumption of RF chain components in high frequencies.

    pdf13p son248 24-03-2020 34 0   Download

  • Recently terrestrial digital broadcasting systems have experienced a growth with the demand of high-data rate. In order to meet such demand, the multiple-input multiple-output (MIMO) technology has received wide attention. This paper proposes a pre-coding method, which provides high-space channel correlation for the improved performance over terrestrial broadcasting channels when the MIMO spatial multiplexing (SM) is adopted for digital video broadcasting-next generation handheld systems.

    pdf5p son248 24-03-2020 20 0   Download

  • Digital video broadcasting-next generation handheld (DVB-NGH) is the first broadcasting standard that incorporates multiple-input multiple-output (MIMO) techniques to overcome the Shannon limit of single antenna systems. This paper contributes to analyze the performance of the DVB-NGH MIMO coded modulation system. The detailed performance degradation from information-theoretic limit to implementation by average mutual information and extrinsic information transfer analysis is presented, which provides an insight guideline for future system improvement.

    pdf5p son248 24-03-2020 22 0   Download

  • 5G antenna is so compact size but has to get large bandwidth, high gain and good radiation efficiency to be able to support huge data rate for 4.0 revolution industry. In this paper, a novel 4x4 multiband Multiple Input Multiple Output (MIMO) antenna is designed. Using the semi-circle structure, the proposed antenna not only achieves wide band but also is easy to optimize operate frequencies at millimeter wave band.

    pdf8p vitunis2711 11-12-2019 29 3   Download

  • This paper is aimed to provide a comprehensive review on the spectrally efficient transmission techniques applied in multiple antenna systems. Specifically, three state-of-the-art techniques which make use of the spatial domain to convey information bits, including the Vertical Bell-Labs Layered Space-Time (V-BLAST), the source-based spatial modulation (SM) and the media-based modulation (MBM), will be surveyed and their critical advantages as well as limitations will be highlighted.

    pdf10p viengland2711 23-07-2019 19 0   Download

  • This paper proposes a multiple beamforming system with robust optimum criteria to exploit the channel and minimize the inter-user interference among the cells. This system uses combined cylindrical array antenna multiple beamforming architecture with spatial multiplexing.

    pdf13p visumika2711 17-07-2019 23 1   Download

  • In this paper, focus on model that combines the spatial multiplexing technique and the cooperative communications, with relay nodes using decode and forward technique where source node and the relay nodes have only one antenna, destination node has multiple antennas; and relay nodes use amplify and forward technique to reduce power consumption and suitable for compact devices; and destination node uses zero forcing (ZF) algorithm.

    pdf8p sansan2 26-05-2018 38 2   Download

  • You will understand the physical meaning behind the mathematics of wireless signals and learn the intricacies and tradeoffs in signal selection and design.

    pdf903p dangkhoa1612 18-05-2013 156 49   Download


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