摘要:
A hybrid combining method in a receiver is provided, and the method includes that wideband combining, e.g. using a maximum ratio combining (MRC) or an interference rejection combing (IRC) process, to combine signals distributed over a first plurality of subcarrier frequencies from antennas in the same polarization direction is performed, resulting in a combined signal for each polarization direction that is distributed over a smaller number of subcarrier frequencies, then a two-port narrowband IRC is done of these wideband combined signals for the two polarization directions, resulting in a diversity combined signal.
摘要:
The present invention relates to a receiving node, and to a related method of adjusting a frequency domain channel estimate in a receiving node of a wireless communication system using Orthogonal Frequency Division Multiplexing. The method comprises estimating (210) a phase rotation of the frequency domain channel estimate, and compensating (220) for the estimated phase rotation in the frequency domain channel estimate. It also comprises transforming (230) the compensated frequency domain channel estimate into a time domain channel estimate, filtering (240) the time domain channel estimate to suppress noise, transforming (250) the filtered time domain channel estimate back into a noise suppressed frequency domain channel estimate, and adding (260) the estimated phase rotation in the noise suppressed frequency domain channel estimate to achieve an adjusted and improved frequency domain channel estimate.
摘要:
A device (110) receives consecutive negative acknowledgments (NACKs) (540), measures a downlink channel quality (530) associated with the device (110), and triggers autonomous retransmission (430) when power is limited in the device (110), when the device (110) is using a minimum usable enhanced dedicated channel (E-DCH) transport format combination (ETFC), and when one of a number of consecutive NACKs (540) is greater than a predefined number, or the measured downlink channel quality (530) is less than a predefined threshold.
摘要:
A noisy frequency-domain channel estimate enhancer includes an over-sampler configured to transform the noisy frequency-domain channel estimate into a time-domain channel estimate that is virtually over-sampled by an integer factor m. The over-sampler is connected to a de-interleaver configured to divide the time-domain channel estimate into m de-interleaved sub-vectors. The de-interleaver is connected to a suppressor configured to suppress noisy taps from each de-interleaved sub-vectors to form m noise suppressed sub-vectors. The suppressor is connected to a selector configured to select a noise suppressed sub-vector associated with a highest signal-to-noise ratio. The selector is connected to a discrete Fourier transformer configured to transform the selected noise suppressed sub-vector into a noise suppressed preliminary frequency-domain channel estimate. The discrete Fourier transformer is connected to a phase-shifter configured to phase-adjust the taps of the noise suppressed preliminary frequency-domain channel estimate to form an enhanced frequency-domain channel estimate.
摘要:
Method and arrangement in a user equipment (120) for selecting a radio channel out of a plurality of candidate radio channels. The selected radio channel is to be utilized for receiving control information from a base station (110). The user equipment (120) and the base station (110) are comprised in a wireless communication system (100). The method comprises determining (302) a physical entity of a signal received from the base station (110) over a candidate radio channel, out of the plurality of candidate radio channels. If the determined physical entity fulfills a criterion, the associated candidate radio channel is prioritized (303) for a check sum check. The check sum check is performed (304) on data received over the prioritized candidate radio channel. If the check sum check is successful, the prioritized candidate radio channel is selected (305).
摘要:
A device (110) receives consecutive negative acknowledgments (NACKs) (540), measures a downlink channel quality (530) associated with the device (110), and triggers autonomous retransmission (430) when power is limited in the device (110), when the device (110) is using a minimum usable enhanced dedicated channel (E-DCH) transport format combination (ETFC), and when one of a number of consecutive NACKs (540) is greater than a predefined number, or the measured downlink channel quality (530) is less than a predefined threshold.
摘要:
A hybrid combining method in a receiver is provided, and the method includes that wideband combining, e.g. using a maximum ratio combining (MRC) or an interference rejection combing (IRC) process, to combine signals distributed over a first plurality of subcarrier frequencies from antennas in the same polarization direction is performed, resulting in a combined signal for each polarization direction that is distributed over a smaller number of subcarrier frequencies, then a two-port narrowband IRC is done of these wideband combined signals for the two polarization directions, resulting in a diversity combined signal.
摘要:
A first radio network node (110) and a method therein for measuring interference as well as a second radio network node (120) and a method therein for enabling the first radio network node to measure interference are disclosed. The first radio network node (110) obtains (201) configuration information for indicating a designated subframe in which a reference signal for measurement of the interference is to be transmitted by the second radio network node (120). The second radio network node (120) obtains (202) configuration information for configuring a designed subframe for transmission of a reference signal. The first radio network node (110) receives (205), in the designated subframe indicated by the configuration information, the reference signal transmitted by the second radio network node (120). The first radio network node (110) determines (206) a value of the interference based on the reference signal.
摘要:
A method and arrangement in a network entity of delay calibration for an OFDM system in a mobile communication system are disclosed. The delay calibration technique as disclosed includes estimating a time delay difference according to a phase difference between two adjacent sub-carriers, dividing the estimated time delay difference into a coarse time delay and a fine time delay, and compensating the coarse time delay in time domain and the fine time delay in frequency domain respectively.
摘要:
Method and arrangement in a user equipment (120) for selecting a radio channel out of a plurality of candidate radio channels. The selected radio channel is to be utilized for receiving control information from a base station (110). The user equipment (120) and the base station (110) are comprised in a wireless communication system (100). The method comprises determining (302) a physical entity of a signal received from the base station (110) over a candidate radio channel, out of the plurality of candidate radio channels. If the determined physical entity fulfils a criterion, the associated candidate radio channel is prioritized (303) for a check sum check. The check sum check is performed (304) on data received over the prioritized candidate radio channel. If the check sum check is successful, the prioritized candidate radio channel is selected (305).