A non-data-aided method of calculating an estimate of the sampling frequency offset (SFO) in a digital receiver involves performing a plurality of correlations between two identical sized groups of samples within a received signal where the spacing of the groups is varied for each correlation. In various examples the number of samples in the groups is also varied. For larger symbols, the group of samples may comprise approximately the same number of samples as the guard interval in a symbol and for smaller symbols, the group of samples may comprise approximately the same number of samples as an entire symbol. An estimate of the SFO is determined by identifying the largest correlation result obtained from all the correlations performed. The largest correlation result indicates the largest correlation.

Methods and apparatus for frequency offset estimation are disclosed. In an exemplary embodiment, a method includes determining a demodulation reference signal (DMRS) frequency offset estimate from DMRS symbols in a received signal, and determining a cyclic prefix (CP) frequency offset estimate from cyclic prefix values in the received signal. The method also includes combining the DMRS and CP frequency offset estimates to determine a final frequency offset estimate. In an exemplary embodiment, an apparatus includes a DMRS frequency offset estimator that determines a DMRS frequency offset estimate based on DMRS symbols received in an uplink transmission, and a cyclic prefix (CP) frequency offset estimator that determines a CP frequency offset estimate based on cyclic prefix values in the uplink transmission. The apparatus also includes an offset combiner that combines the DMRS frequency offset estimate with the CP frequency offset estimate to generate a final frequency offset estimate.

Embodiments disclosed herein include systems and methods for locating all synchronization signal blocks on a 5G new radio channel. Such systems and methods can include measuring downlink signal energy over a bandwidth of the 5G new radio channel to identify a center frequency of a signal broadcast on the 5G new radio channel, processing the signal at the center frequency of the signal to identify a first of a plurality of synchronization signal blocks and global OFDM symbol boundaries for the wireless radio channel, and using the global OFDM symbol boundaries for all raster frequencies of the 5G new radio channel to identify remaining ones of the plurality of synchronization signal blocks.

A intelligent backhaul radio is disclosed that is compact, light and low power for street level mounting, operates at 100 Mb/s or higher at ranges of 300 m or longer in obstructed LOS conditions with low latencies of 5 ms or less, can support PTP and PMP topologies, uses radio spectrum resources efficiently and does not require precise physical antenna alignment.

The present disclosure relates to a pre-5th-Generation (5G) or 5G communication system to be provided for supporting higher data rates Beyond 4th-Generation (4G) communication system such as Long Term Evolution (LTE). A method for operating a receiving device in a wireless communication system comprises determining inter-symbol interference between symbols in a received signal, determining a location of a receive detection window according to the inter-symbol interference, and demodulating the received signal based on the location of the receive detection window. A receiving device includes at least one transceiver, and at least one processor configured to determine inter-symbol interference between symbols in a received signal, determine a location of a receive detection window according to the inter-symbol interference, and demodulate the received signal based on the location of the receive detection window. A transmitting device includes at least one processor configured to estimate an equivalent channel frequency response based on characteristic information of a time-domain filter, estimate an inter-symbol interference based on the equivalent channel frequency response, and generate indication information regarding an adjustment of a location of a receive detection window.

In some implementations, a method in a wireless network includes allocating a radio resource to a plurality of transmitters. The radio resource is configured for simultaneously transmitting and receiving user data with varying transmission delays. User data bursts are received, from the plurality of transmitters, with varying transmission delays transmitted over the allocated radio resource with varying resource identities.

A Long Term Evolution (LTE) receiver performing a half cyclic prefix (CP) shift on received subframes is disclosed, comprising: an analog to digital conversion (ADC) module; a cyclic prefix (CP) removal module coupled to the ADC module configured to retain a portion of cyclic prefix samples; a fast Fourier transform (FFT) module configured to receive samples from the cyclic prefix removal module, and to perform a FFT procedure on the received samples using a FFT window, the FFT window being shifted ahead based on the retained portion of cyclic prefix samples, to output an orthogonal frequency division multiplexed (OFDM) symbol; and a rotation compensation module coupled to the FFT module, the rotation compensation module configured to perform phase de-rotation of the OFDM symbol.

A communication method is to be performed by a secondary transceiver. The secondary transceiver is operatively associated with a primary transceiver. The primary transceiver is configured to transmit an orthogonal frequency division multiplexing (OFDM) signal that has consecutive OFDM symbols. The OFDM symbol has a fixed OFDM symbol length and includes a cyclic prefix that has a fixed prefix length. The communication method includes steps of: A) upon receipt of the OFDM signal, determining a starting position of the cyclic prefix; and B) transmitting a to-be-transmitted signal during a time corresponding to the cyclic prefix of the one of the OFDM symbols or another one of the OFDM symbols subsequent to the one of the OFDM symbols.

Cyclic prefix (CP) detection and removal in a wireless communications system (WCS) is disclosed. More specifically, embodiments disclosed herein relate to removing a CP(s) from a random-access symbol(s) in an open radio access network (O-RAN) communications system in the WCS. The random-access symbol(s) includes the CP followed by a random-access sequence. As such, the CP must be removed before the random-access sequence can be detected and processed. In this regard, in embodiments disclosed herein, the O-RAN communications system is configured to determine a group delay associated with the random-access symbol(s) to thereby accurately determine a start of the CP in the random-access symbol(s). Accordingly, the O-RAN communications system can detect and remove the CP from the random-access symbol(s) based on the determined start of the CP. As a result, it is possible to preserve integrity of the random-access symbol(s) to thereby reduce random-access latency in the WCS.

Certain aspects of the present disclosure provide techniques for downlink resource blanking. A method that may be performed by a user equipment (UE) includes receiving one or more first signals from a first cell and one or more second signals from a second cell within a sampling window, comparing a first timing of the one or more first signals with a second timing of the one or more second signals, and transmitting, to the first cell, an indication of whether to enable or disable blanking of one or more resources based on the comparison.