Systems and methods for improved digital RF transport in a DAS are provided. In one embodiment, a transceiver comprises: a receive path circuit including an RF reception interface coupled to an ADC, the ADC receiving a down-converted analog RF spectrum from the RF reception interface and producing a digitized RF spectrum at an input sampling rate; a logic device receiving the digitized RF spectrum and producing a first set of baseband data samples at a first sampling rate, corresponding to a first spectral region of the analog RF spectrum and a second set of baseband data samples at a second sampling rate, corresponding to a second spectral region of the analog RF spectrum. The logic device maps the first set and second sets of baseband data samples to a respective first set and second set of timeslots of a serial data stream transport frame.

Systems and methods for improved digital rf transport in distributed antenna systems

The invention discloses a method and a device for realizing channel measurement. The method comprises the following steps: confirming a to-be-measured antenna port subset for UE (user equipment) according to the current status information of UE, and informing the UE of performing channel measurement and feeding back the status information aiming at the to-be-measured antenna port subset. According to the invention, when the status information of the UE meets the conditions, the overhead cost for feeding back the channel status information by the UE can be lowered by only measuring a reference signal of partial antenna port and feeding back the channel status information of the partial antenna port.

Method and device for realizing channel measurement

A system is provided for overlapping cells for wireless coverage in a cellular communication system The system includes a beam-weight generator and beamformer coupled to the beam-weight generator The beam-weight generator is configured to generate a plurality of beam weights including at least first and second sets of beam weights And the beamformer is configured to apply the first and second sets of beam weights to signals in a cellular communication system The cellular communication system provides coverage over a geographic region divided into cells arranged in overlapping first and second layers of cells having criteria optimized for respective, distinct first and second types of services, or communication by respective, distinct first and second types of user terminals In this regard, the criteria are reflected in the first and second sets of beam weights

Overlapping cells for wireless coverage

A method and an apparatus for implementing channel measurement are disclosed in the present invention. The method includes: determining an antenna port subset, which is required to be measured, for a UE according to current state information of the user equipment UE; and informing the UE to perform channel measurement for the subset of antenna ports that is required to be measured and feed back channel state information. Through the present invention, when the state information of the UE meets a certain condition, the UE measures only the reference signals of a part of antenna ports, and feeds back channel state information for this part of antenna ports. Therefore, the overhead generated by the feedback of the UE to the channel state information is reduced.

Method and apparatus for implementing channel measurement

The invention is applied to the technical field of wireless communication, and provides a channel estimation method, a channel estimation device and a receiver. The method comprises the following steps of: calculating a channel frequency-domain response initial estimation valve of a subcarrier in which a received pilot signal is by a least square estimation algorithm; interpolating a data subcarrier between every two adjacent subcarriers and calculating a channel frequency-domain response interpolation estimation value of the interpolated data subcarrier; filtering the channel frequency-domain response initial estimation valve and the interpolation estimation value; and outputting the filtered channel frequency-domain response initial estimation valve and the interpolation estimation value. In the method and the device, when the channel frequency domain response interpolation estimation value of the interpolated data subcarrier is calculated, the quasi-real-time tracking and simple, efficient and accurate channel estimation of a wireless communication time-varying channel are realized by adopting the technology of origin shifting, quadrant-based phase adaptation, polar rotation route selection and the like, so high channel estimation performance can be achieved and simultaneously the algorithm complexity proximate to that of a linear interpolation method is still maintained.

Channel estimation method, device and receiver

This invention provides a method for sending pilot data and its channel estimation method for MIMO-OFDM system, in which, the sending method for pilot data includes: first of all, keeping orthogonal to pilot fequencies on a transmission antenna and putting transmission data symbols with orthgonal mode between sub-carriers of adjacent pilot symbols, which can increase performance of channel estimation under nearly same pilot spending.

Pilot frequency data transmission method for MIMO-OFDM system and signal channel estimation method thereof

A hierarchical softcell wireless network and a access control method therefore are provided. The network comprises a signal covering plane, a softcell plane and a service requirement plane, wherein a control center controls wireless resource use and operate mode of distributed antennas to form multi-layer softcells overlapping geographically; service requirement plane centralizes services of different velocity scenes distributed geographically; the access control method of the hierarchical softcell network according to the present invention mapps a user terminal to a certain softcell in the softcells that is suitable for the terminal to service based on mapping relationship between velocity feature and softcell layer by estimating the velocity of the terminal. The hierarchical softcell wireless network considers network performance, practicability and complexity synthetically, and can reduce system interference, use wireless resource efficiently, equalize loads, control handover load level of the network and improve system capacity and service quality.

Hierarchical softcell wireless network and access control method therefore

The invention discloses a time-realm channel estimating method under symbolic timing error, which is characterized by the following: replacing front corresponding number symbol of first channel extraction window through several front symbol of second channel extraction window; simplifying the estimating method of time-realm channel; improving property of channel estimation under symbol timing error.

Ping Zhou

Papers

Pilot frequency data transmission method for MIMO-OFDM system and signal channel estimation method thereof

Hierarchical softcell wireless network and access control method therefore

Time-domain channel estimating method under symbol timing error