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A design of MIMO antennas using two monopole structures adding a neutral line connected to ground plane for achieving better isolation is proposed and examined. The antenna uses curved C-shaped arm to resonance the bands of IEEE802.11b/g/n; another arm extended on the feed achieves the bands of IEEE 802.11a application. The overall size of the design is 45×25×1.6mm3; the occupied area of the antenna...
Multiple input multiple output-orthogonal frequency division multiplexing (MIMO-OFDM) is the core technology for the next generation wireless local area network (WLAN). Broader coverage and higher spectral efficiency are the main goals of the next generation WLAN. Multi-user MIMO (MU-MIMO) is a promising way to meet this requirement. In this paper, a novel regularized block diagonalization (RBD) precoded...
A dual band and compact multi input multi output (MIMO) antenna for WLAN has been present in this letter. The proposed antenna operates over a wide frequency range of 1.93–2.79 GHz and 4.79–6.19 GHz suitable for long-term evolution (LTE) and wireless local area network (WLAN). The two elements antenna with a compact size of 39×40×1.5 mm3 which is designed on a FR4 substrate with a dielectric constant...
Recently, several MIMO transmission method is investigated for increasing the capacity or spectral efficiency. To well utilize the MIMO transmission approach, channel state information is required in transmission side. So, channel sounding in receiver side also becomes important for feedback the low-error channel state information to the transmitter. Thus, we investigate the detail procedure and performance...
A tri-band MIMO antenna operating in WLAN 2.4/5.2/5.8GHz bands and WiMAX 2.5/3.5/5.5GHz bands is presented in this paper. The proposed MIMO antenna consists of two CPW-fed antenna elements and a P-shaped patch. The two antenna elements have high isolations which are over 28dB in the WLAN 5.2/5.8GHz bands and WiMAX 3.5/5.5GHz bands and over 30 dB in the WLAN 2.4GHz band and WiMAX 2.5GHz band. The high...
We focus on MIMO mesh networks, which consist of wireless nodes supporting MIMO transmission. Communication quality of a wireless link using MIMO spatial streams is sensitive to change in its channel, and performance will be unstable. For stable operation of MIMO mesh networks, a method analyzing the MIMO mesh networks is needed. In this paper, we aim to propose an analyzing method of MIMO mesh networks...
WLAN IEEE 802.11n is recent wireless data communication technology which provides high throughput and high performance. These features are definitely determined by the strength of MIMO decoder. The existing MIMO decoder of WLAN 802.11n is based on linear method, i.e Zero Forcing (ZF) and Minimum Mean Square Error (MMSE). Both of them are low in complexity but poor in performance. In the other hand...
This paper presents an Inverted-F Antennas (IFAs) type MIMO antenna with Wi-Fi and Blue-Tooth band for smart watch application. The overall dimensions of 40×40×5.4 mm3 of the proposed design consisting of an antenna portion of 40×5×0.1 mm3 and system ground portion of 40×40×0.4 mm3. The antenna geometry is composed of two identical IFA antennas extended from the two side of the ground, which designed...
This paper represents the design and implementation of dual-polarized-triple-frequency 2×2 Multiple-Input-Multiple-Output (MIMO) antenna with extremely high isolation capabilities having total dimensions of 50×155mm2. Proposed antenna succeeds triple band frequency operations including GSM (IEEE-802.21), WiMAX (IEEE-802.16) and WLAN (IEEE-802.11n) bands of modern wireless communication system. Circular...
A 4-port Multiple-Input-Multiple-Output (MIMO) antenna with tri-band frequency operation covering GSM (IEEE-802.21), WiMAX (IEEE-802.16) and WLAN (IEEE-802.11n) bands for modern wireless broadband communication applications has been designed and investigated. Proposed MIMO antenna has linearly polarized (LP) GSM band and circularly polarized (CP) WiMAX, WLAN bands poses ≤ 3dB axial ratios (AR), demonstrating...
In this paper, a compact microstrip resonant cell (CMRC) is proposed to improve isolation of antenna elements in the design of multiple-input multiple-output (MIMO) antennas. The MIMO antenna used for studies consists of two symmetrical L-shaped planar inverted-F antenna (PIFA) elements placed at a distance of 16.2 mm on a printed-circuit board (PCB). A single-layer CMRC is etched on the PCB between...
This paper presents a novel multiband planar diversity antenna covering five frequency bands for personal wireless communication system.The dual antenna system consists of two symmetric inverted L-shaped monopole antennas along with capacitively coupled Rectangular Open Ring Resonator (RORR) and spiral structure that generate resonant modes covering GSM 1800, LTE2300, LTE2500, WiMAX and WLAN frequency...
This paper presents a simple but effective scheduling scheme for sphere decoding (SD) with runtime constraints in multiple-input multiple-output communication systems. The proposed scheme imposes runtime constraints on SD to distribute the errors due to the early termination of SD. Because the distributed errors may be corrected effectively by forward error correction, the error-rate performance can...
A novel compact four element MIMO antenna is presented in this paper. By utilizing aperture sharing technique, TETRA band and high WLAN band will be covered. The simulated results show that RL > 10 dB and the port isolation > 20 dB on both bands, what's more, radiation patterns show good characteristics on both TETRA band and high WLAN band. What's more, the ECC is less than 0.01, which satisfied...
An eight-element, dual-band, low profile multiple-input-multiple-output (MIMO) antenna system is proposed for access points within wireless local area networks (WLANs). Cylindrical dielectric resonator antennas (cDRAs) are used as the radiating elements. One group of four cDRAs covers the 2.45 GHz WLAN band while the other four antenna elements cover the second band at 5.8 GHz. By implementing a simple...
A dual-polarized triple-band multiple input multiple output (MIMO) antenna is proposed for WLAN/WiMAX access points. The dual-polarized antenna consists of two identical crossed triple-band dipoles each of which is printed on each side of a square substrate, forming a planar compact dual-polarized configuration. Measured results show that the dual-polarized triple-band antenna covers the WLAN 2.4-GHz...
In this paper, a compact printed dual-band dual-port multiple-input multiple-output (MIMO) antenna operating in the 2.4-GHz (2.4–2.5 GHz) band of the IEEE802.11b/g standard and in the 5-GHz (4.9–5.1 GHz, 5.15–5.35 GHz, 5.47–5.725 GHz)band of the IEEE 802.11a with dual band decoupling elements is presented. Each dual-band antenna consists of a one quarter wavelength monopole slot and one half wavelength...
A planar multiple-input multiple-output (MIMO) antenna with a compact size of 34×26 mm2 for ultra wideband applications is presented. It consists of orthogonally placed microstrip fed planar monopole antenna with rectangular split ring resonator (SRR) slots to notch WiMAX and WLAN bands. The isolation between the monopoles is improved by using meander shaped ground stubs. The compact antenna provides...
A multi-band uniplanar MIMO antenna for mobile devices, covering Long Term Evolution (LTE) and Wireless Local Area Network (WLAN) bands is proposed. The antenna features two radiating elements composed of direct-fed and couple-fed monopoles with parasitic structures to allow wideband coverage. The MIMO design features four main operating bands, 695–963, 1790–2650, 3520–3702, and 5565–6348 MHz. The...
A Wireless Internet-access Mesh NETwork (WIM-NET) provides the scalable and reliable internet access through the multiple access points (APs) and wireless relay communications. In particular, by redundantly deploying APs in the network field, the WIMNET becomes robust to the link or AP failure. However, these redundant APs increase the power consumption, and thus the number of active APs should be...
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