Wisig Networks Private Limited

Indian Institute of Technology Hyderabad

Centre of Excellence in Wireless Technology

Uurmi Systems Pvt Ltd

Center of Excellence in Wireless Technology

Wsig Private Networks Limited

Iit-Hyderabad

Iit-Madras

Indian Institute of Technology Hyderabad (Iith)

Kiran Kumar Kuchi

Saidhiraj Amuru

Bhaskar Ramamurthi

Sibgath Ali Khan Makandar

Padmanabhan Madampu Suryasarman

Krishnamurthi Giridhar

Dileep Manisseri Kalathil

Vinod Ramaswamy

Baskaran Dhivagar

Jeniston Deviraj Klutto Milleth

Deviraj Klutto Milleth Jeniston

Sunil Kaimalettu

Harish Kumar Dureppagari

Sheetal Kalyani

Nadeem Akhtar

Rajet Krishnan

Pavan Kumar Reddy Manne

Sreekanth Dama

Geordie George

Prasanth Karunakaran

Yerrapareddy Sivakishore Reddy

Nanda Kishore Chavali

Dhivagar Baskaran

Shahriar Emami

Makandar Sibgath Ali Khan

Karthik Kuntikana Shrikrishna

Koteswara Rao Gudimitla

Anusha Kilari

Naga Sekhar Suruvu

Mounika Sheela

Nikhil Reddy Allola

Sriharsha Magani Ramarao

Giridhar Krishnamurthi

Arpit Jain

Sivakishore Reddy Yerrapareddy

Alok Ranjan Kesari

Thomas Velerrian Pasca Santhappan

Abhinav Kumar

Bheemarjun Reddy Tamma

Dharma Teja Bade

Uday Babulal Desai

A base station (BS) and a method of operating the BS. The BS comprises a distributed unit (DU) and a radio unit (RU). The DU is configured to transmit control information to the RU using a control message. The DU is configured to transmit u-plane data to the RU using a u-plane message. The RU is configured to receive the u-plane message according to a semi persistent technique or a periodic technique. The control message comprises a c-plane message or an m-plane message. The control message comprises an indication to use the semi persistent technique or the periodic technique to receive the u-plane message. The indication is valid to be used by the RU to receive the u-plane message carrying the u-plane data and at least one u-plane message subsequently received by the RU, for a predetermined time period as indicated by the control message.

Method and system for transferring data between distributed unit and radio unit

Embodiments of the present disclosure relate to systems and methods to generate a signal in a communication network. The method comprises fdtering a discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-s-OFDM) data signal, and one of a DFT-S-OFDM and orthogonal frequency division multiplexing (OFDM) reference signal (RS) using a data filter and a RS filter respectively, to produce filtered data signal and filtered RS. The RS filter has one to one relationship with the data filter. Thereafter, port mapping the filtered RS to a corresponding port assigned to the transmitter to obtain port mapped filtered RS, wherein the port mapped filtered RS comprises a first subset of non-zero locations comprising of the filtered RS values and a second subset of zero locations comprising of zero values.

Methods and systems for generating a low peak- to-average power ratio (PAPR) data and reference signal

The present disclosure discloses a method and a system for transmitting DFT-s-OFDM symbols. A data sequence for transmitting as an OFDM symbol is received as input from a data source. A reference sequence for transmitting along with the data sequence as the OFDM symbol is generated and time-multiplexed with the data sequence, to generate a multiplexed sequence. Thereafter, a Discrete Fourier Transform (DFT) operation is performed on the multiplexed sequence to generate a DFT-spread-Orthogonal Frequency Division Multiplexing (DFT-s-OFDM) symbol that is further processed for transmitting over a channel. The transmission of the reference sequence and the data sequence in a single OFDM symbol provides better bandwidth utilization and flexibility in modulation of the reference sequence and the data sequence.

Method and a system for transmitting DFT-s-OFDM symbols

Embodiments of the present disclosure relate to a method and system for transmitting a sequence with low peak-to-average-power-ratio (PAPR). A communication system receives control data. A transmitter of the communication system comprises a plurality of sequences which are associated with the control data in the transmitter. The transmitter selects a sequence from the plurality of sequence. The selected sequence is rotated, pre-coded for generating pre-coded sequence. DFT is applied on the pre-coded sequence for generating frequency domain signals. The frequency domain signals are processed and corresponding waveform is transmitted to a receiver of the communication system. The receiver receives the waveform and is processed to extract the sequence from the waveform. The receiver correlates the extracted sequence with plurality of sequences stored in receiver memory to detect the control data. The generated waveform has low PAPR.

Systems and methods for transmitting control data in a communication network

Embodiments of the present disclosure relate to a method and system to generate a waveform in a communication network. The transmitter receives an input data and transmit a generated waveform to another communication system. The input data is spread with a spread code to generate a spread data and rotated using a constellation rotation operation to produce a rotated data. The rotated data is then precoded using precoding filter to produce a precoded data, and transformed into DFT output data using DFT operation. The DFT output data is then mapped with subcarriers to generate the sub-carrier mapped DFT data and modulated using Orthogonal Frequency Division Multiplexing (OFDM) modulation to generate the waveform with low PAPR.

System and method for generating spreaded sequence with low peak-to-average power ratio (PAPR) waveform

The present disclosure discloses a method and a system for providing a code cover to Orthogonal Frequency Division Multiplexing (OFDM) symbols in a multiple user system. A data sequence is received from each of a plurality of users. Further, a reference sequence is generated for the data sequence of each of the plurality of users. Each of the reference sequence is multiplied with a code cover which are orthogonal to each other. Each of the reference sequence is time-multiplexed with corresponding data sequence, to generate a corresponding multiplexed sequence. Further, a Discrete Fourier Transform (DFT) is performed on each of the multiplexed sequence to generate a corresponding DFT-spread-Orthogonal Frequency Division Multiplexing (DFT-s-OFDM) symbol. Lastly, the corresponding DFT-s-OFDM symbol is processed for transmitting over corresponding one or more channels.

Method and system for providing code cover to OFDM symbols in multiple user system

Embodiments of the present disclosure provide a method of processing received signal using a massive MIMO base station (BS). The BS includes at least a radio unit (RU), a distributed unit (DU) and an interface. The method includes at least receiving a plurality of signals corresponding to the plurality of antennas, said signals include at least one of data signals, demodulation reference signals (DMRS) and sounding reference signals (SRS). The RU or DU performs a grouping operation on a subset of the plurality of signals corresponding to a subset of antennas to generate signal groups. The RU performs a first stage filtering on the signals associated with each group using group specific filters to obtain group specific filtered signals. The DU performs a second stage filtering on the group specific filtered signals to obtain second stage filtered signals.

Method of signal processing by a massive MIMO base station receiver

Embodiments of the present disclosure relate to a base station and method for communication in a communication network. The method comprising signaling a DMRS-configuration or SRS-configuration to at least one UE. The DMRS-configuration comprises signaling at least one antenna port number from multiple antenna port numbers, each antenna port number indicates location of occupied subcarriers and null subcarriers associated with a DMRS transmission of the at least one UE. The SRS-configuration comprises signaling of parameters associated with a time, a frequency and a code. The method also comprises receiving a data and DMRS signals, or SRS signals corresponding to the at least one UE. Further, grouping a subset of the signals corresponding to a subset of antennas to generate a plurality of signal groups. Next, performing first stage filtering at RU followed by second stage filtering at DU of the signals associated with each signal groups to obtain filtered signals.

Massive MIMO interference suppression receivers aided by network signaling

Embodiments herein provide method of determining modulation and coding scheme (MCS) at a base station (BS). The method comprises obtaining, by the BS, downlink channel state information (DL-CSI) corresponding to a plurality of UEs. Also, the method comprises receiving feedback from the plurality of UEs, said feedback is at least one of explicit interference power and noise power feedback, post processing signal power-to-interference power plus noise power-based and determining MCS associated with a subset of UEs from the plurality of UEs using a predefined mapping between the MCS and a combination of DL-CSI and the feedback from the plurality of UEs. Further, the method comprises indicating the determined MCS to the subset of UEs from the plurality of UEs.

Method of determining modulation and coding scheme (MCS) and a system thereof

Embodiments of the present disclosure relate to a method and system to selecting a waveform in a communication network. The method comprises selecting at least one sequence from a plurality of sequences for transmitting, said plurality of sequences comprises a plurality of sub-set of sequences such that a sequence in a sub-set of sequences is a cyclic shifted version another sequence in said sub-set of sequences. Also, the method comprises rotating at least one sequence from a plurality of sequences by 90 degrees to produce at least one rotated sequence. Further, the method comprises transforming the at least one rotated sequence into frequency domain using a Discrete Fourier Transform (DFT) to generate a transformed sequence and mapping the transformed sequence using a plurality of subcarriers to generate a mapped sequence. Thereafter, the method comprises processing the mapped sequence to generate a waveform having an optimized PAPR, optimized auto and cross-correlation.

Method and system for generating a transmit waveform for reference sequences

Embodiments of the present disclosure relate to a base station (BS) and method for communication in a communication network. The method comprising signaling at least one antenna port number from multiple antenna port numbers to a UE. Also, the method comprises receiving a data and a reference signal (RS) corresponding to the UE. The data and the RS are received on one or more receive antennas of the BS, wherein the RS comprises occupied RS subcarriers and null subcarriers. A location of occupied RS subcarriers and null subcarrier positions are selected according to signaled antenna port. Next, channel parameters are estimated using the occupied subcarriers associated with the received RS, and interference plus noise parameters using the null subcarriers. Thereafter, equalizing the received data on the receive antennas using the measured channel parameters and the interference plus noise parameters for interference rejection and data detection.

Method for communication in a communication network

Embodiments of the present disclosure provide a method of processing received signal using a massive MIMO base station (BS). The BS comprises a radio unit (RU), a distributed unit (DU) and an interface. The method comprises receiving a plurality of signals corresponding to the plurality of antennas, said signals comprises at least one of data signals, demodulation reference signals (DMRS) and sounding reference signals (SRS). The RU or DU performs a grouping operation on a subset of the plurality of signals corresponding to a subset of antennas to generate signal groups. The RU performs a first stage filtering on the signals associated with each group using group specific filters to obtain group specific filtered signals. The DU performs a second stage filtering on the group specific filtered signals to obtain second stage filtered signals.

Embodiments of the present disclosure relate to systems and methods to generate a signal in a communication network. The method comprises filtering a discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-s-OFDM) data signal, and one of a DFT-S-OFDM and orthogonal frequency division multiplexing (OFDM) reference signal (RS) using a data filter and a RS filter respectively, to produce filtered data signal and filtered RS. The RS filter has one to one relationship with the data filter. Thereafter, port mapping the filtered RS to a corresponding port assigned to the transmitter to obtain port mapped filtered RS, wherein the port mapped filtered RS comprises a first subset of non-zero locations comprising of the filtered RS values and a second subset of zero locations comprising of zero values.

Methods and systems for generating a low peak-to-average power ratio (PAPR) data and reference signal

Embodiments of the present disclosure are related a method for wireless communication. The method comprises receiving by a base station (BS), signals from a plurality of user equipment's (UEs) and obtaining channel estimates associated with each UE using the received signals. Next, calculating a first metric for each UE, and each of the plurality of beams associated with the BS using the obtained channel estimates and determining one or more best beams from a plurality of beams associated with the BS, and a second metric for each UE using the first metric. Further, segregating the UEs into groups based on the determined one or more best beams and the second metric. Thereafter, performing beamforming on control channel based on the one or more best beams, and performing allocation of at least one of resources, modulation and coding scheme for a control channel based on the segregated groups.

Method for wireless communication using beamformed physical downlink control channel (PDCCH)

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Hyderabad Telangana, India

Kiran Kumar Kuchi