A method and an apparatus for estimating synchronization of a broadcast signal in a time domain using a synchronization estimation signal through steps of: performing a correlation operation using a correlation window on a plurality of synchronization estimation signals separated to a plurality of paths and outputting a plurality of correlated signals; delaying the plurality of correlated signals to output a plurality of delayed signals; and estimating the synchronization using the plurality of delayed signals are provided.

A wireless device may receive packets according to a protocol, such as Bluetooth, and may rapidly react to receive an interfering RF packet instead of dropping the first RF packet and the interfering RF packet, to decrease message delay due to collisions in high device density environments. When a received signal strength indicator (RSSI) difference between the interfering RF packet and the first RF packet exceeds a threshold, the device may detect the interfering packet and resync a portion of its circuitry to lock on to and receive the interfering packet. The wireless receiver may detect the interfering RF packet by detecting one or more of: a specific resync byte sequence, an increase in RSSI, or a phase shift. Additionally, a wireless device may add the specific resync byte sequence to an RF packet of a standard protocol.

An apparatus for providing fast-settling quadrature detection and correction includes: a quadrature correction circuit that receives four quadrature clock signals; a quadrature detector that selects two clock signals among the four quadrature clock signals; and a phase digitizer that generates a digital code indicating a phase difference between the two clock signals. The quadrature correction circuit adjusts a phase between the two clock signals using the digital code.

A technique of separating a sequence of modulation shift keying (MSK) symbols into a first portion and a second portion and separately comparing the first portion of the sequence of MSK symbols and the second portion of the sequence of MSK symbols against a first portion of a reference sequence of MSK symbols and a second portion of the reference sequence of MSK symbols allows a low complexity detection of a start field delimiter in a wireless communication packet.

In an aspect of the disclosure, a method, a computer-readable medium, and an apparatus are provided. The apparatus may determine a UE. The apparatus may generate a reference signal using a base sequence obtained from a table, the table including a plurality of base sequences that each have a peak-to-average-power ratio (PAPR) metric below a threshold. Then, the apparatus transmits the reference signal to a base station. The reference signal may be multiplexed with a data transmission.

A physical layer circuit includes registers and a timing circuit. The registers are configured to store a future time of day, a local hardware time and a compensation value. The timing circuit is configured to: determine a relationship between the local hardware time and a grandmaster time; select the future time of day; determine a difference between a local clock and a grandmaster clock and set the compensation value equal to the difference; subsequent to determining the difference, enable maintenance of a current time of day; when the local hardware time matches the future time of day, begin updating the current time of day based on the compensation value to match the grandmaster time; and adjust the compensation value to compensate for drift between the current time of day and the grandmaster time.

Various aspects described herein relate to techniques for synchronization channel design and signaling in wireless communications systems (e.g., a 5th Generation (5G) New Radio (NR) system). In an aspect, a method includes identifying a frequency band supported by a user equipment (UE), identifying one or more frequency locations based on the identified frequency band, and the one or more frequency locations are a subset of synchronization raster points used for synchronization signal transmission. The method further includes searching for at least one synchronization signal based on the one or more identified frequency locations.

A method of operating a digital radio receiver is provided as follows: a) receiving a radio signal comprising a symbol sequence; b) selecting a portion of the symbol sequence; c) determining a first error between the selected portion of the symbol sequence and a first predetermined symbol sequence using a difference metric; d) determining a set of second errors between the selected portion of the symbol sequence and a respective set of second predetermined symbol sequences, each formed by prepending different length portions of a predetermined preamble symbol sequence to a beginning of the first predetermined symbol sequence; and e) determining a minimum error from the first error and the set of second errors. If the first error is not the minimum error, a different portion of the symbol sequence is selected. Otherwise, a following portion of the symbol sequence is decoded to produce a data payload.

A technique of separating a sequence of modulation shift keying (MSK) symbols into a first portion and a second portion and separately comparing the first portion of the sequence of MSK symbols and the second portion of the sequence of MSK symbols against a first portion of a reference sequence of MSK symbols and a second portion of the reference sequence of MSK symbols allows a low complexity detection of a start field delimiter in a wireless communication packet.

Various aspects described herein relate to techniques for synchronization channel design and signaling in wireless communications systems (e.g., a 5th Generation (5G) New Radio (NR) system). In an aspect, a method includes identifying a frequency band supported by a user equipment (UE), identifying one or more frequency locations based on the identified frequency band, and the one or more frequency locations are a subset of synchronization raster points used for synchronization signal transmission. The method further includes searching for at least one synchronization signal based on the one or more identified frequency locations.