Abstract: The present invention discloses a signal receiver and signal receiving method involving nonlinear detection method for mmWave OTFS systems in high mobility scenarios with non-ideal power amplifier, which is applicable in the fifth generation (5G) and beyond networks. The millimeter wave (mmWave) system is envisioned to be a promising candidate of 5G. However, the high frequency and large bandwidth operation in mmWaves result in nonlinear distortions from the power amplifier in the system. The nonlinearly distorted signals from non-ideal power amplifier when propagate through a wideband high mobility channel tremendously degrades the systems performance. Attributed to the non-ideal power amplifier, the nonlinear distortions induce multiplicative distortions and inter symbol interference (ISI) in the OTFS system. It further causes the posterior probability of the transmitted signal non-Gaussian and analytically intractable.

Abstract: Unmanned aerial vehicle (UAV) mount with a base station, also known as Flying Base Station (FBS) has garnered considerable attention for 5G and beyond communication. This invention provides a method and system for deploying a swarm of FBSs over a geographical region autonomously. The proposed 3-D deployment technique exhibit how to place a minimum number of FBSs energy efficiently over a region to offer guaranteed QoS without inter-UAV interference and UAV capacity limit violations. A Master-Slave coordination technique is revealed to maintain inter-FBS synchronization to avoid collisions during the transition. The technique for selecting intermediate hop coordinates is proclaimed under path planning.

Abstract: The present invention provides a new pilot pattern and channel estimation method involving such pilot for mmWave OTFS systems in high mobility scenarios with non-ideal power amplifier, which is applicable in the fifth generation (5G) and beyond networks. The pilot pattern for communication signal in wireless communications involving mmWave systems with non-ideal power amplifier comprises signal including a pilot signal element, information-bearing symbol and zero as guard, wherein, position of pilot and guard are arranged to combat the effect of inter symbol interference (ISI) from nonlinear impairment of the power amplifier for accurate channel estimation.

Abstract: The present invention reports a spectrally efficient low complex OFTS modulation based communication system and method for resource-constrained IoT device and M2M type communication in high-mobility environment comprising at least one transmitter configured to transmit bit stream involving adaptive OTFS frame with selectively embedded pilot depending on mobility condition for improving spectral efficiency and at least one receiver configured to dispose onto IoT devices with a low-complex iterative detector for receiving thus transmitted bit stream. The receiver is configured to update the transmitter about its mobility condition through a control channel.

Abstract: The present invention discloses a wide microstrip antenna array based antenna system for millimeter wave applications. The microstrip antenna array based antenna system of the present invention includes plurality of patch antennas and each of the patch antennas includes a U-slot of unequal arms. This patch antenna with the U-slot acts as the array element. The array elements are placed in a linear array at a distance of ?/2 from each other on the antenna substrate to achieve desired scan performance. The microstrip corporate feed network with T-junction power divider is used. The antenna elements are fed by electromagnetic coupling with the feed network. The antenna array with dummy elements on both sides of the linear array together with an extra ground plane is used to achieve improved array performance with high main lobe gain and reduced side lobe.

Abstract: The present invention discloses a broadband microstrip patch antenna (106) with U-shaped slot (116) with unequal arms for millimeter wave communications. The electromagnetic coupled type feed is used with microstrip line (103) printed on another substrate layer to minimize feed loss. The dimension of the patch, position and dimension of slots, height of dielectric layer, length, width of the microstrip line and so on are optimized to achieve the desired impedance and gain pattern over the 60 GHz frequency band.

Abstract: In distributed communication networks, the signal received at the destination is characterized by unknown multiple carrier frequency offsets (MCFOs) and improper channel state information (CSI). The knowledge of offsets and channel gains are required for coherent deployment of distributed systems. Hence, joint training sequence (TS) design method is proposed for joint estimation of MCFOs and channel estimation over spatially correlated channel. Thus, the present invention provides a method of providing joint estimation for distributed communication systems with multiple antennas at the nodes over spatial correlated channels. The designed optimal training sequences are short length and spectrally efficient. The designed training sequence produces zero cross-correlation, facilitating channel estimation without matrix inversion, significantly lowers the complexity of the estimation algorithm.

Abstract: In distributed communication networks, the signal received at the destination is characterized by unknown multiple carrier frequency offsets (MCFOs) and improper channel state information (CSI). The knowledge of offsets and channel gains are required for coherent deployment of distributed systems. Hence, joint training sequence (TS) design method is proposed for joint estimation of MCFOs and channel estimation over spatially correlated channel. Thus, the present invention provides a method of providing joint estimation for distributed communication systems with multiple antennas at the nodes over spatial correlated channels. The designed optimal training sequences are short length and spectrally efficient. The designed training sequence produces zero cross-correlation, facilitating channel estimation without matrix inversion, significantly lowers the complexity of the estimation algorithm.

Abstract: A method of timing synchronization in sub-band based ultra wideband systems, includes obtaining a coarse estimate of an offset in a time domain at a sub-sampled rate, and obtaining a fine estimate of the offset in an analog domain. The method further includes correcting a timing in the analog domain by transforming the fine estimate to an equivalent phase for the correcting.

Abstract: A method and a system for handling interference between a low power network and a high power network sharing a common frequency band are provided. The method includes receiving an association request message containing a set of parameters from the low power device. The method further includes determining a second set of parameters for transmission of the data in the uplink direction based on the first set of parameters, where the second set of parameters indicates resources allocated to the low power device for transmitting the data in a presence of interference from the high power network device on the common frequency band. Moreover, the method includes sending an association response message containing the second set of parameters to the low power device in response to the association request message.

Abstract: A method of timing synchronization in sub-band based ultra wideband systems, includes obtaining a coarse estimate of an offset in a time domain at a sub-sampled rate, and obtaining a fine estimate of the offset in an analog domain. The method further includes correcting a timing in the analog domain by transforming the fine estimate to an equivalent phase for the correcting.

Abstract: Provided are a timing synchronization method and apparatus in a wireless communication system that may synchronize timing based on channel energy having a low Signal to Noise Ratio (SNR) in a wideband (WB) system. The timing synchronization apparatus in the wireless communication system may capture optimal channel energy by performing a comparison using a timing estimation scheme based on a correlation peak.

Abstract: Provided are a timing synchronization method and apparatus in a wireless communication system that may synchronize timing based on channel energy having a low Signal to Noise Ratio (SNR) in a wideband (WB) system. The timing synchronization apparatus in the wireless communication system may capture optimal channel energy by performing a comparison using a timing estimation scheme based on a correlation peak.