A method of transmitting data via a unipolar signal comprises allocating a symbol to one or more signals among a plurality of signals, applying pulse shaping to the plurality of signals to obtain a plurality of filtered signals, wherein the filtered signals are orthogonal signals, and transmitting the sum of the filtered signals as a unipolar signal, wherein the transmitted signal is a weighted sum of the filtered signals. The data can be recovered at the receiver by applying a plurality of orthogonal matched filters to the received unipolar signal to obtain a plurality of filtered signals, and performing symbol detection on the plurality of filtered signals to determine the received symbol. Apparatus for transmitting and receiving unipolar signals are also disclosed.

A user device communicates in a wireless network by encoding a set of data symbols with a set of complex-valued codes to produce a set of subcarrier values. The subcarrier values are modulated onto a set of Orthogonal Frequency Division Multiplexing (OFDM) subcarriers assigned to the user device to produce a time-domain waveform that comprises a superposition of modulated subcarriers, and the time-domain waveform is transmitted in the wireless network. The set of subcarrier values comprises a first polyphase code that encodes a first of the set of data symbols and at least a second polyphase code that encodes at least a second of the set of data symbols. The first polyphase code causes constructive and destructive interference between the modulated subcarriers to produce a first periodic pulse waveform having a peak value centered at a first time in an OFDM symbol interval, and the second polyphase code causes constructive and destructive interference between the modulated subcarriers to produce a second periodic pulse waveform having a peak value centered at a second time in the OFDM symbol interval, wherein the second time is different from the first time.

Aspects of the present application provide methods and devices for time domain implementation of a single carrier waveform such as single carrier quadrature amplitude modulation (QAM) DFT-s-OFDM and single carrier Offset QAM (OQAM). A time domain implementation allows flexible symbol lengths, lower implementation complexity as a large IDFT operation is not required in the time domain and support for variable cyclic prefix (CP) length. An OQAM implementation utilizes a pre-processing step to convert a K complex QAM symbol sequence into a 2K OQAM symbol sequence and generates a sequence for transmission in the time domain as opposed to the frequency domain.

A cooperative multi-user multiple input, multiple output (MIMO) antenna array comprises a MIMO subspace processing system communicatively coupled by a first network to a first set of antennas residing on multiple geographically distributed wireless terminals in a mobile radio network. The first set of antennas is updated to produce a second set of antennas, and the first network is reconfigured to connect the MIMO subspace processing system to the second set of antennas. MIMO subspace processing is reconfigured to employ channel state information for the second set of antennas to generate a plurality of non-interfering subspace channels occupying a common frequency in the mobile radio network.

A method of transmitting data via a unipolar signal comprises allocating a symbol to one or more signals among a plurality of signals, applying pulse shaping to the plurality of signals to obtain a plurality of filtered signals, wherein the filtered signals are orthogonal signals, and transmitting the sum of the filtered signals as a unipolar signal, wherein the transmitted signal is a weighted sum of the filtered signals. The data can be recovered at the receiver by applying a plurality of orthogonal matched filters to the received unipolar signal to obtain a plurality of filtered signals, and performing symbol detection on the plurality of filtered signals to determine the received symbol. Apparatus for transmitting and receiving unipolar signals are also disclosed.

Circularly pulse-shaped waveforms for communication systems are disclosed herein, including a single carrier modulation in which pulse-shaping is performed using a circular convolution by the transmitter for various modulation schemes. A transmitter, related method, and corresponding receiver are also disclosed for demodulation of the single carrier circularly pulse-shaped signal and data extraction.

A receiver receives a multicarrier signal from a wireless communication network and determines subcarrier values of the multicarrier signal. A decoder decodes the subcarrier values to produce a set of data symbols. The multicarrier signal is characterized by a set of modulated pulse waveforms, which results from a sum of the subcarriers. Each of the modulated pulse waveforms has a different time offset. The decoder employs a set of codes for decoding the baseband signal, wherein each code comprises a different linearly increasing phase. Each of the linearly increasing phases corresponds to one of the different time offsets.

Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive an indication of a set of frequency domain resources allocated to the UE for communicating data over a wireless channel. The UE may receive an indication of a waveform type associated with the set of frequency domain resources. The waveform type may be based at least in part on a data type of the data, may be used for a defined amount of time, and may be one of a plurality of waveform types that are multiplexed together over different frequency domain resources within a total system bandwidth. The UE may communicate within the set of frequency domain resources according to the indicated waveform type and the data type.

A receiver has an antenna to receive a pulse shaped transmit signal transmitted by a transmitter of a multi carrier (MC) pulse shaped transmission system. The pulse shaped transmit signal includes a predefined signal pattern. The predefined signal pattern is not subjected to pulse shaping. The receiver includes a filter to pulse shape filter the pulse shaped transmit signal to obtain data for the receiver. The predefined signal pattern is retrieved from the pulse shaped transmit signal prior to filtering the pulse shaped transmit signal.

Methods, systems, and devices for a rearrangement scheme for a Faster-than-Nyquist (FTN) waveform are described. An example method includes a user equipment (UE) receiving a phase rearrangement indication from a network entity, the phase rearrangement indication indicating one or more parameters associated with a phase rearrangement process for a FTN discrete Fourier transformation spread orthogonal frequency division multiplexing (DFT-s-OFDM) transmission scheme. The method may also include transmitting a signal based at least in part on the phase rearrangement indication and according to the DFT-s-OFDM transmission scheme. Another example method includes a network entity transmitting a phase rearrangement indication indicating one or more parameters associated with a phase rearrangement process for a DFT-s-OFDM transmission scheme and receiving a signal based at least in part on the phase rearrangement indication and according to the DFT-s-OFDM transmission scheme.