Patent classifications
H04L2027/0048
Synchronization between an object and a reader contactlessly communicating by active load modulation
A method of contactless communication can be performed between an object and a reader using active load modulation. A synchronization process is performed between a first carrier signal transmitted by the reader and having a reference frequency, and a second carrier signal extracted from an output signal of a controlled oscillator of a digital phase-locked loop of the object. In the synchronization process, as long as a locking of the loop has not been detected, the frequency of the output signal of the oscillator is latched on a frequency that is a multiple of the reference frequency. Once the locking has been detected, the latching continues while controlling the oscillator with a second control signal generated from a second value obtained.
IQ MISMATCH CORRECTION FILTER
An IQ estimation module comprising a powerup state IQ estimator configured to generate powerup state IQ estimates based on a powerup calibration of the IQ estimation module, a steady state IQ estimator configured to generate steady state IQ estimates during a steady state operation of the IQ estimation module, and an IQ estimate extender configured to determine differences between the powerup state IQ estimates and steady state IQ estimates at their respective frequency bins and adjust the powerup state IQ estimates to improve the accuracy of IQ estimates.
METHOD AND APPARATUS FOR TRANSMITTING INFORMATION
A method for transmitting information includes: determining a target frequency range involved in an in-device interference in user equipment when the in-device interference is likely to occur, the target frequency range including a target downlink frequency range and at least one target uplink frequency range; adjusting a transmission resource configuration within the target frequency range; and transmitting information over a transmission resource after adjustment of the transmission resource configuration within the target frequency range, to avoid occurrence of the in-device interference.
SYNCHRONIZATION BETWEEN AN OBJECT AND A READER CONTACTLESSLY COMMUNICATING BY ACTIVE LOAD MODULATION
A method of contactless communication can be performed between an object and a reader using active load modulation. A synchronization process is performed between a first carrier signal transmitted by the reader and having a reference frequency, and a second carrier signal extracted from an output signal of a controlled oscillator of a digital phase-locked loop of the object. In the synchronization process, as long as a locking of the loop has not been detected, the frequency of the output signal of the oscillator is latched on a frequency that is a multiple of the reference frequency. Once the locking has been detected, the latching continues while controlling the oscillator with a second control signal generated from a second value obtained.
Clock synchronization method, receiver, transmitter, and clock synchronization system
A clock synchronization method, a receiver, a transmitter, and a clock synchronization system, where the method includes obtaining a common reference clock signal, determining B.sub.t according to the common reference clock signal and Mr.sub.d(t1), where
determining that Mr.sub.d(t1) is a target Mr.sub.d when C.sub.t obtained by means of calculation according to Mr.sub.d(t1) is less than or equal to a threshold, where C.sub.t=B.sub.tA.sub.t, A.sub.t is included in a residual time stamp (RTS) packet received by a receiver last time from the transmitter, and
OFDM-Based Data Transmission Method And Apparatus
Embodiments of the present disclosure relate to an OFDM-based data transmission method and an apparatus. In one example method, a transmitting device generates a data packet. The data packet comprises at least one orthogonal frequency division multiplexing (OFDM) symbol. The OFDM symbol comprises N sequentially numbered subcarriers. The N subcarriers are divided into L subblocks. Each subblock of the L subblocks comprises N/L subcarriers including M pilot subcarriers. Start subcarriers of adjacent subblocks are adjacently numbered subcarriers. A numbering interval is the same for adjacent subcarriers in each subblock of the L subblocks. Each subblock of the L subblocks corresponds to one phase rotation signal. Signals carried on the subcarriers in each subblock of the L subblocks are signals obtained by multiplying original signals by a corresponding phase rotation signal. The transmitting device sends the data packet.
Clock Synchronization Method, Receiver, Transmitter, and Clock Synchronization System
A clock synchronization method, a receiver, a transmitter, and a clock synchronization system, where the method includes obtaining a common reference clock signal, determining B.sub.t according to the common reference clock signal and Mr.sub.d(t1), where
determining that Mr.sub.d(t1) is a target Mr.sub.d when C.sub.t obtained by means of calculation according to Mr.sub.d(t1) is less than or equal to a threshold, where C.sub.t=B.sub.tA.sub.t, A.sub.t is included in a residual time stamp (RTS) packet received by a receiver last time from the transmitter, and
performing frequency division on the common reference clock signal using the target Mr.sub.d as a frequency dividing coefficient to obtain a first clock signal, and performing frequency multiplication processing on the first clock signal to obtain a service clock signal. Hence, random phase offset may be avoided.
Electronic device and operation method therefor
An electronic device includes: An electronic device includes a first communication module and a second communication module configured to perform wireless communication, a spread spectrum clock generator (SSCG), a memory, and a processor. The processor is configured to execute instructions to set a spread spectrum method and a spread ratio of the SSCG, determine whether the electronic device is communicatively coupled to at least one of a first and a second wireless communication, identify a frequency band of a channel of the at least one of the first and the second wireless communication, determine whether at least one of a frequency and multiplication frequencies of the frequency is included by the frequency band of the channel, and maintain the spread spectrum method and the spread ratio causing the SSCG to generate a spread spectrum clock signal based on first spread spectrum method and the spread ratio.