Abstract: Strontium oxide (SrO) nanoparticle and various concentrations of chitosan (CS)-doped SrO nanocomposite were synthesized via co-precipitation method. A variety of characterization techniques including were done for characterizing and qualifying the nanocomposite. X-ray powder diffraction affirmed cubic and tetragonal structure of SrO nanoparticle and CS-doped SrO nanocomposite with a decrease in crystallinity upon doping. Fourier transform infrared spectrum endorsed existing functional groups on CS/SrO surfaces while d-spacing was estimated using high resolution Transmission electron microscopes images. UV-Visible and Photoluminescence spectroscopy spectra showed an increase in band gap energies with an increase in doping concentration. Elemental composition of CS-doped SrO nanocomposite deposited with different doping concentrations was studied using Energy dispersive Spectroscopy.

Abstract: Strontium oxide (SrO) nanoparticle and various concentrations of chitosan (CS)-doped SrO nanocomposite were synthesized via co-precipitation method. A variety of characterization techniques including were done for characterizing and qualifying the nanocomposite. X ray powder diffraction affirmed cubic and tetragonal structure of SrO nanoparticle and CS-doped SrO nanocomposite with a decrease in crystallinity upon doping. Fourier transform infrared spectrum endorsed existing functional groups on CS/SrO surfaces while d-spacing was estimated using high resolution Transmission electron microscopes images. UV-Visible and Photoluminescence spectroscopy spectra showed an increase in band gap energies with an increase in doping concentration. Elemental composition of CS-doped SrO nanocomposite deposited with different doping concentrations was studied using Energy dispersive Spectroscopy.

Abstract: CS-doped SrO nanocomposite were successfully synthesized through co-precipitation route for bactericidal activities. Effect of CS doping on morphological features, optical properties, elemental composition and phase constitution on CS-doped SrO nanocomposite was analyzed. XRD analysis confirmed tetragonal and cubic structures of SrO nanoparticles and CS-doped SrO nanocomposite. UV-vis spectroscopy was used to obtain 4.19 eV of SrO nanoparticles while emission spectra of doped SrO showed blueshift upon CS doping with multi-concentration. Interlayer d-spacing attained from HRTEM micrographs well matched with XRD d-spacing. Purity content of prepared nanostructures was measured with EDS analysis. Overall, 0.06:1 showed significant antibacterial activity against both Gram +ve and -ve bacterial isolates. Thus, CS-doped SrO nanocomposite can be used in modem medicine as an alternative antibacterial to overcome the development of resistance to antibiotics.

Abstract: Strontium oxide (SrO) nanoparticle and various concentrations of chitosan (CS)-doped SrO nanocomposite were synthesized via co-precipitation method. A variety of characterization techniques including were done for characterizing and qualifying the nanocomposite. X ray powder diffraction affirmed cubic and tetragonal structure of SrO nanoparticle and CS-doped SrO nanocomposite with a decrease in crystallinity upon doping. Fourier transform infrared spectrum endorsed existing functional groups on CS/SrO surfaces while d-spacing was estimated using high resolution Transmission electron rnicroscopes images. UV-Visible and PL Photoluminescence spectroscopy spectra showed an increase in band gap energies with an increase in doping concentration. Elemental composition of CS-doped SrO nanocomposite deposited with different doping concentrations was studied using Energy dispersive Spectroscopy.

Abstract: A compact, low profile integrated antenna design covering both 4G and 5G applications with good performance and that fits in handheld mobile terminals. The antenna design is a PIFA-based MIMO antenna system for 4G standards integrated with a planar connected array (PCA) for 5G bands. The antenna is fabricated on a two-layer printed circuit board (PCB) accommodating four antenna elements (3, 4, 5 and 6) along with a planar connected array (9) on a top layer, and a plurality of parallel slots (12) forming a defected ground structure in a bottom layer. The integrated antenna has approximately a typical smart phone backplane size. The plurality of parallel slots behave as a defected ground structure (DGS) for isolation enhancement within the MIMO antenna system band at 2.1 GHz and as a radiator (PCA) for 5G applications at 12.5 GHz.

Abstract: A compact MIMO antenna system having connected arrays supporting multi-bands with multiple configurations. Two low band microwave MIMO antenna arrays operate at frequency bands below 6 GHz, and two high band microwave MIMO antenna arrays operate at frequencies above 10 GHz. The antenna arrays are connected together as connected arrays and support 4G as well as 5G bands. The antenna arrays are carried by an overlying layer of dielectric material and overlie two slots formed as rectangularly shaped closed loop in an underlying ground plane. The low band arrays each have a feeding arm that spans across the slots to act as a single antenna element, and the high band antenna arrays are power combiners/dividers with a single feeding point and four elements forming a two-to-one structure exciting the underlying slots, wherein the slots are excited and shared for compact design and wide operating bandwidth.

Abstract: A compact MIMO antenna system having connected arrays supporting multi-bands with multiple configurations. Two low band microwave MIMO antenna arrays operate at frequency bands below 6 GHz, and two high band microwave MIMO antenna arrays operate at frequencies above 10 GHz. The antenna arrays are connected together as connected arrays and support 4G as well as 5G bands. The antenna arrays are carried by an overlying layer of dielectric material and overlie two slots formed as rectangularly shaped closed loop in an underlying ground plane. The low band arrays each have a feeding arm that spans across the slots to act as a single antenna element, and the high band antenna arrays are power combiners/dividers with a single feeding point and four elements forming a two-to-one structure exciting the underlying slots, wherein the slots are excited and shared for compact design and wide operating bandwidth.

Abstract: In MIMO wireless communications employing LMMSE receiver, the symbols transmitted through a transmit antenna are estimated at the receiver in the presence of interference consisting of two main components: one due to the additive noise and the other due to (interfering) symbols transmitted via the remaining antennas. This has been shown to hamper the performance of a communication system resulting in incorrect symbol decisions, particularly at low SNR. IMMSE has been devised as a solution to cope with this problem; In IMMSE processing, the symbols sent via each transmit antenna are decoded iteratively. In each stage of processing, the received signal is updated by removing the contribution of symbols detected in the previous iterations. In principle, this reduces the additive interference in which the desired symbols are embedded in. Therefore, the interference level should reduce monotonically as one goes down in processing order.

Abstract: A method for providing closed-loop transmit precoding between a transmitter and a receiver, includes defining a codebook that includes a set of unitary rotation matrices. The receiver determines which preceding rotation matrix from the codebook should be used for each sub-carrier that has been received. The receiver sends an index to the transmitter, where the transmitter reconstructs the precoding rotation matrix using the index, and precodes the symbols to be transmitted using the preceding rotation matrix. An apparatus that employs this closed-loop technique is also described.

Abstract: The present invention provides a folded low-complexity (FLC) pipeline. In one embodiment, the FLC pipeline includes a dot product unit chain configured to employ only addition and multiplication operations to compute intermediate numerators and denominators from a received signal matrix, a channel gain matrix and a noise matrix. Additionally, FLC pipeline also includes a divider stage configured to terminate the dot product unit chain by computing an unscaled quotient and a scale factor from ultimate ones of the intermediate numerators and denominators.

Abstract: A Hybrid IMMSE-LMMSE receiver processing technique predicts performance of and selects between iterative and non-iterative decoding of symbols based on an intelligent metric. Based on a pre-specified criterion, the receiver determines if a correct first-stage decision is made or not. If a correct decision is made, then it follows iterative processing like in BLAST. Alternatively, if a wrong decision is found to have occurred, the receiver resorts to LMMSE estimation processing.

Abstract: A system comprises a wireless device that communicates across a spectrum having a plurality of sub-channels. The wireless device comprises a plurality of antennas through which the wireless device communicates with another wireless device, wherein each antenna communicates with the other wireless device via an associated communication pathway. The wireless device further comprises sub-channel power analysis logic coupled to the antennas and adapted to determine which communication pathway has the highest communication quality on a sub-channel by sub-channel basis. The wireless device still further comprises diversity selection logic coupled to the sub-channel power analysis logic and adapted to determine a weighting vector for an associated antenna based on the communication quality, wherein the weighting vector specifies a relative transmission power for each sub-channel for the associated antenna.