In one aspect, an apparatus includes: a fast Fourier transform (FFT) engine to receive and convert a plurality of orthogonal frequency division multiplexing (OFDM) samples into a plurality of frequency carriers; a detector coupled to the FFT engine to determine a channel estimate for a first frequency carrier using a first channel estimate for the first frequency carrier and a plurality of other channel estimates, each of the plurality of other channel estimates for one of a plurality of neighboring frequency carriers within an evaluation window, and determine a log likelihood ratio (LLR) for the first frequency carrier using the channel estimate for the first frequency carrier; and a decoder coupled to the detector to decode a first OFDM symbol comprising the first frequency carrier using the LLR for the first frequency carrier.

Provided are a threshold value determination method and apparatus, a resource determination method and apparatus, a network device and a storage medium. The threshold value determination method includes: a first threshold value is determined according to a preset rule, where the first threshold value is a threshold value of each span in a span pattern. The resource determination method includes: a resource that should be reserved or dropped is determined by utilizing a threshold value of a span; where the resource includes a candidate set, or all candidate sets within a search space, or all candidate sets of the search space within a current span, or candidate sets of all search spaces within the span.

Methods, systems, and devices for wireless communications are described. A base station may identify time and frequency resources for a physical downlink shared channel (PDSCH) to be transmitted to a user equipment (UE) in a first transmission time interval (TTI). The base station may transmit configuration information for a control channel search space set in a second TTI. The second TTI may precede the first TTI. The configuration information may include an indication of an absence of a physical downlink control channel (PDCCH) transmission to send in the control channel search space set indicating the identified time and frequency resources for the PDSCH, and a set of time and frequency resources for the control channel search space set. The UE may receive the configuration information and identify the time and frequency resources allocated for the PDSCH in the second TTI, and receive the PDSCH transmission in the second TTI.

In some aspects of the systems, methods, and devices described herein, one or more asymmetric modulation constellations may be utilized. For example, a modulation constellation utilized to modulate data symbols may be asymmetric. In some approaches, an asymmetric modulation constellation may be generated by introducing a phase shift (e.g., cyclic shift, phase rotation) to one or more constellation points of a modulation constellation. An asymmetric modulation constellation may allow detecting phase shifts without ambiguity. For example, a user equipment (UE) may perform channel estimation or phase noise estimation aided by data symbols that are modulated with an asymmetric modulation constellation. In some examples, a UE may receive a message from a network entity indicating a configuration of an asymmetric modulation constellation. The UE may demodulate data symbols of a data signal based on a channel characterization estimate that is associated with the configuration of the asymmetric modulation constellation.

Certain aspects of the present disclosure provide techniques that may for configuration of parameters for monitoring for a combination downlink control information (DCI) that schedules data and/or reference signal transmissions in multiple cells. An example method generally includes determining, a blind decode (BD) limit and a control channel element (CCE) limit based on a scaling factor less than one, determining physical downlink control channel (PDCCH) parameters based on the BD limit and the CCE limit for monitoring for a combination downlink control information (DCI) that schedules at least one of data or reference signal (RS) transmissions in multiple cells, and monitoring for the combination DCI based on the determined PDCCH parameters.

Provided are a threshold value determination method and apparatus, a resource determination method and apparatus, a network device, and a storage medium. The threshold value determination method includes: a first threshold value is determined according to a preset rule, where the first threshold value is a threshold value of each span in a span pattern. The resource determination method includes: a resource that should be reserved or dropped is determined by utilizing a threshold value of a span; where the resource includes a candidate set, or all candidate sets within a search space, or all candidate sets of the search space within a current span, or candidate sets of all search spaces within the span.

Various aspects of the present disclosure generally relate to wireless communication, and to network configured multi-stage physical downlink control channel (PDCCH) blind detection. For example, a network node causes a user equipment (UE) to perform a two-stage PDCCH blind detection procedure by transmitting an indication of the two-stage procedure to the UE. During a first stage of the two-stage procedure, the UE measures, for each PDCCH candidate of a first PDCCH candidates, a demodulation reference signal (DMRS) associated with the PDCCH candidate. During a second stage of the two-stage procedure, the UE performs a blind detection operation on at least one PDCCH candidate of second PDCCH candidates. The second PDCCH candidates include members of the first candidates selected in accordance with the measurements. Performance of the two-stage procedure identifies a PDCCH candidate, from the second set of PDCCH candidates, via which the UE receives control information from the network node.