155results about How to "Improve communication system performance" patented technology

The present invention provides a method of distributing content to a plurality of clients. The method on a server begins with accessing content to be distributed to a plurality of clients and identifying a first type of content to be distributed as crucial content and identifying a second type of content to be distributed as non-crucial content. The crucial content is any content required to properly render, after a decryption process, the content. The non-crucial content is all the other content to be distributed. The crucial content is encrypted with a first encrypting key which is unique to each of the plurality of clients. The crucial content which has been encrypted is transmitted. The non-crucial content is transmitted to the plurality of clients.

A system and method for transparent coordinated beam-forming are provided. A method for transmitting information includes determining correlations between communications devices served by a communications controller and communications devices served by neighboring communications controllers, selecting a communications device from the communications devices served by the communications controller, adjusting a manner of transmission of a transmission containing information to the selected communications device based on a correlation for the selected communications device, and transmitting the transmission to the selected communications device.

Embodiments of the present invention disclose a method and an apparatus for security algorithm selection processing, a network entity, and a communication system. The method includes: receiving a service request message sent by user equipment; and according to a security protection requirement of the service request message, selecting a security algorithm from a security algorithm list supported by both the user equipment and a network entity, where security algorithm lists supported by the user equipment and/or the network entity are set separately based on different security protection requirements, or security algorithm lists supported by the user equipment and the network entity are used for indicating security capability of the user equipment and the network entity respectively.

A communication device for use in a non-self synchronizing scrambling (NS3) communication system and a method for using NS3 in a communication system are disclosed. A digital data stream is scrambled by modifying the digital data stream based on a pseudo-noise sequence (PNS) to produce a scrambled digital data stream. The PNS has a timing reference that is distinct from the digital data stream. The scrambled digital data stream is capable of being descrambled by performing an inverse modification, based on the same PNS and the same timing reference. The scrambled digital data stream may be transmitted over a communication medium and descrambled at the opposing end of the communication medium. Synchronization between the scrambler and the descrambler is maintained by providing a common timing reference to the scrambler and the descrambler. The common timing reference is distinct from the data stream. The invention can be used on any communication system in which all the communication devices have a common timing reference.

Disclosed are methods and apparatuses for transmitting and receiving control information in a communication system supporting unlicensed band communication. An operation method of a terminal may comprise receiving, from a base station, first configuration information of a CORESET and second configuration information of a search space associated with the CORESET; receiving, from the base station, third configuration information indicating one or more PDCCH monitoring resource sets associated with the CORESET and the search space; and performing a PDCCH monitoring operation on the one or more PDCCH monitoring resource sets. Therefore, the performance of the communication system can be improved.

The present invention relates in general to a method, apparatus, and article of manufacture for providing high-speed digital communications through a communications channel. In one aspect, the present invention employs variable delay FIR equalizer in the transmitter module to increase the system performance in channel communications.

Apparatus, and an associated method, for selectably permitting data to be scheduled and transmitted to effectuate a data service, such as a WAP-based service. Power control commands generated pursuant to separate communications by way of a dedicated air interface link are monitored. Responsive to values of the power control commands, data is either permitted to be transmitted or prevented form being transmitted, depending upon channel conditions upon which the data bursts are to be transmitted.

An operation method of a terminal in a wireless communication system is disclosed. The operation method of the terminal comprises the steps of: receiving common information from any one among a plurality of base stations; and performing a random access procedure with a first base station among the plurality of base stations by using the common information, wherein the step of performing the random access procedure includes the steps of: transmitting a random access preamble; receiving a random access response; and transmitting an uplink message (RACH MSG3). Therefore, a performance of the communication system can be improved.

An apparatus, comprises an interface (113) receiving first data scheduled for a first set of channels by a remote scheduler (107). A local scheduler (111) allocates data for a second set of channels in response to a power usage assumption of the power used by the remote scheduler (107). A transmit power processor (117) determines a transmit power associated with the first data in a first time interval of a scheduling time interval of the local scheduler (111) and a power limiter (119) is arranged to limit a transmit power level of the first data in the scheduling time interval in response to the determined power resource. The resulting signal is transmitted to user equipment (123) by a transceiver (121). The invention may be particularly suitable for a 3^rd generation cellular communication system supporting High Speed Downlink Packet Access (HSDPA) services.

Disclosed are a method and an apparatus for transmitting or receiving uplink feedback information in a communication system. An operation method of a terminal may comprise receiving downlink control information (DCI) from a base station, the DCI including resource allocation information of a physical downlink shared channel (PDSCH); receiving data # n from the base station through the PDSCH indicated by the DCI; generating a hybrid automatic repeat request (HARQ) codebook including an HARQ response bit # n for the data # n and an HARQ response bit # n−1 for data # n−1 received from the base station before the data # n; and transmitting the HARQ codebook to the base station. Therefore, the performance of the communication system can be improved.

A method for processing a frequency division multiplexing signal transmitted in a channel is provided. The method includes the steps of a) receiving the frequency division multiplexing signal having a residual intercarrier interference (ICI) and a channel noise and transmitted by plural subcarriers; b) performing a cyclic prefix removal and a discrete Fourier transform for the frequency division multiplexing signal to obtain a frequency-domain signal; c) analyzing the frequency-domain signal to obtain a plurality of correlation values for the residual ICI and the channel noise; and d) performing a communication signal processing for the frequency division multiplexing signal based on at least one of the plural correlation values.

A method for delivering packets in a wireless communications system includes determining a cause of loss for a previously transmitted packet based on a packet acknowledgement corresponding to the previously transmitted packet, the packet acknowledgement including at least one of a wireless loss indicator and a congestion warning indicator for the wireless communications system. The method also includes adjusting a transmission parameter in a packet transmission protocol according to the cause of loss, and retransmitting the previously transmitted packet.

A system and method for packing two-dimensional data bursts in a downlink of a wireless communications system is provided. A method includes allocating resource units to users in the wireless communications system, and packing allocated resource units into rectangular bursts for transmission. The allocating is based on delay characteristics of the user and an amount of information to be transmitted to each user.

A system and method for uplink power control in a wireless communications system are provided. A method for power control of uplink transmissions by a communications device includes computing a power offset based on a signal target and a measured received signal power strength, generating a power control command from the power offset, and transmitting the power control command to the communications device. The signal target is based on control information provided by the communications device.

A circuit for direct current (DC) offset estimation comprises a quantile value circuit and a signal processor. The quantile value circuit determines a plurality of quantile values of an input signal and includes a plurality of quantile filters. Each quantile filter includes a comparator, a level shifter, a monotonic transfer function component, and a latched integrator. The comparator compares the input signal and a quantile value. The level shifter shifts the output of the comparator. The monotonic transfer function component determines the magnitude of the shifted signal and provide a transfer function signal. The latched integrator suppresses transient characteristics of the transfer function signal and provide the quantile value. The signal processor is configured to calculate a weighted average of the quantile values to yield a DC offset estimate.

A data transmission method and central controller for a distributed antenna system and a distributed antenna system. The system includes a central controller and multiple wireless transceiver units. The method includes that wireless transceiver units measure the power of the pilot reference signals received from user terminals and forward this power rate to a central controller; the central controller selects a set of wireless transceiver units for transmitting data to the terminal according to the pilot reference signal power rates of the terminals forwarded by the multiple wireless transceiver units; the central controller performs data processing according to said set of wireless transceiver units; the central controller distributes the processed data to the wireless transceiver units in said set of wireless transceiver units, and the wireless transceiver units in said set perform the downlink data transmission.

An apparatus and method is described that provide an efficient blind channel estimation approach for PSK and DPSK modulated multicarrier communication systems. With the requirement that the channel phase difference between any two adjacent carriers is smaller than one half of the minimum phase difference between two symbols of the PSK or DPSK constellation, a low-complexity deterministic approach to channel estimation is devised. This approach is highly effective, robust, and particularly useful for time varying channels with low AWGN noise.

The invention provides a codeword constructing method for a variable length Polar code, which belongs to the field of communication. According to the invention, a long code generation matrix is constructed by extending the generation matrix of a short code. The method comprises the steps that based on integer binary representation, the code length is expressed as the sum of the powers of two; the value of each term constituting the sum form is used as the size of the sub-matrix which makes up a new generation matrix; and finally, the new generation matrix is constructed through combo-sum combination operation. Compared with a traditional variable length Polar code construction method, the method provided by the invention has the advantages that the puncturing delete operation is not needed; the coding complexity is reduced; delay is reduced; on the decoding end, the likelihood information for the unknown bit is known, which avoids the problems of a traditional method which uses prior knowledge to estimate the unknown bit likelihood information; the error bit rate of decoding is reduced; and the system performance is improved.