144 results about "Channel bank" patented technology

Coding techniques for a (e.g., OFDM) communication system capable of transmitting data on a number of "transmission channels" at different information bit rates based on the channels' achieved SNR. A base code is used in combination with common or variable puncturing to achieve different coding rates required by the transmission channels. The data (i.e., information bits) for a data transmission is encoded with the base code, and the coded bits for each channel (or group of channels with the similar transmission capabilities) are punctured to achieve the required coding rate. The coded bits may be interleaved (e.g., to combat fading and remove correlation between coded bits in each modulation symbol) prior to puncturing. The unpunctured coded bits are grouped into non-binary symbols and mapped to modulation symbols (e.g., using Gray mapping). The modulation symbol may be "pre-conditioned" and prior to transmission.

A wireless telecommunication system and method including at least two transmit antennae and means for implementing a downlink switched sub-channels diversity scheme during transmission. The method includes splitting a total bandwidth allocated for transmission of a transmitted signal to individual sub-channels or groups of sub-channels; boosting each of the sub-channels or groups of sub-channels; and routing each of the sub-channels or groups of sub-channels to a different transmit antenna.

Subscriber traffic loading in wireless channel sets (31) is indirectly estimated, and distribution of channel sets (31) among regions (39) in the confined space is optimized to more evenly allocate subscribers among those channel sets (31). Multiple service providers, multiple wireless technologies, and both donor-site and in-building micro-cell implementations are supported.

A resource allocation method for an orthogonal frequency division multiplexing access (OFDMA) system is provided. The resource allocation method includes dividing a frequency band occupied by a predetermined number of OFDM symbols into a plurality of subbands and determining the number of diversity subchannels, each of which comprises at least two time-frequency resources respectively included in different subbands, and the number of subband selective subchannels, which comprise time-frequency resources that are not included in the diversity subchannels; and generating the diversity subchannels and the subband selective subchannels according to the determined numbers and allocating a physical channel comprised of a generated subchannel to a user in a cell. Accordingly, diversity is enhanced without reducing the freedom of selection of a subband.

Provided are a dynamic resource allocation method based on frequency reuse partitioning for an Orthogonal Frequency Division Multiple Access (OFDMA) system, and a frame transmission method therefor. The dynamic resource allocation method includes: a) dividing a coverage into cells based on frequency reuse partitioning; b) selecting a candidate user to receive a channel allocated thereto based on the ratio; c) acquiring distance information for the candidate user; and d) checking whether the candidate user is in an inner or outer cell area based on the distance information. If the candidate user is in the inner cell area, a subchannel group among subchannel groups having a Frequency Reuse Factor (FRF) lower than a threshold value is selected and subcarriers of the selected subchannel group is allocated. If the candidate user is in the outer cell area, a subchannel group among subchannel groups having a FRF higher than the threshold value is selected.

It is an object of the present invention to avoid communication congestion and collision by effectively assigning a unit radio channel for transmission and reception to RFID tag readers using the same unit radio channel group. Herein disclosed is an RFID tag reading system for reading an RFID tag using a reader / writer used in a low-output RFID tag reading system capable of using channels 1 to 9 available for a reader / writer used in a high-output RFID reading system and channels 10 to 14 not available for a reader / writer used in the high-output RFID tag reading system. The RFID tag reading system receives an RSSI indicative of a received radiowave strength on each of unit radio channels measured by the reader / writers, and assigns channels 1 to 14 preferentially to channels 1 to 9 based on the RSSI.

The invention discloses a micropower wireless network self-organizing method and a micropower wireless network. The micropower wireless network self-organizing method comprises steps that a main node initiates a broadcast network-organizing command hop by hop in a common channel bank and performs data interaction with a sub node in a private channel bank; the main node, after collects a network-organizing beacon transmitted from a concentrator, acquires a node identifier and the time cost of a main node transfer message to a sub node within a first hop range and simultaneously carries out channel scanning and field intensity collection; and main node scans preset numbers and determines whether the numbers conflict, wherein the network is successfully organized if no numbers conflict. The method acquires the time cost reaching various sub nodes by automatically switching channel scanning and field intensity collection, performs collection computation by data in multiple fields so as to comprehensively take consideration in order to achieve fast network organization. The method increases efficiency of network organization to a great extent, shortens network-organizing time, and improves the stability of network communication.

A novel apparatus for and a method of data transmission whereby an input data stream is distributed over a plurality of physical channels within a logical channel group. Transmission of data over the channel group appears as transmission over a single logical channel having a bandwidth approximately equal to the sum of the physical channel bandwidths. The physical channels making up the logical channel group may have different bandwidth capacities. The invention comprises a method of data unit distribution among a plurality of physical channels including the consideration of the bandwidth capacities of the individual physical channels in implementing the distribution algorithm, and the capability of reproducing the order of the transmission of the data units on the receiving side without the need for additional fields or modification of existing fields of the data units. The method of the present invention performs an algorithm whereby the transmitter and the receiver only need to decide to transmit / receive a data unit using the current channel or to switch to the next channel in the channel pool (i.e. the channel group). This decision is made considering the value of a bandwidth parameter and current ‘credit’ counter associated with each channel.

The invention discloses a method for reporting a buffer status report, a method for determining quantity of data and equipment. The method for reporting the buffer status report comprises the following steps of: determining quantity of data to be transmitted of each logical channel bank by user equipment; determining a buffer status report table and buffer size according to the quantity of the data to be transmitted of each logical channel bank; carrying a buffer status report table number and a buffer size number of each logical channel bank in a buffer status report media access control unit; and reporting the buffer status report media access control unit to a network side. The invention provides a scheme which is suitable for a multi-carrier system and is used for selecting from a plurality of buffer status report tables and buffering the status report based on the information of each logical channel bank; and thus, the problems of ways to buffer the status report and determine the quantity of the data to be transmitted under the conditions of availability of a plurality of buffer status reports and large difference in size of the quantity of data of different logical channel banks are solved.

A subscriber's data circuit between channel bank and the customer premises carries fractional T1 bandwidth on a digital subscriber line (DSL) circuit. For example, for an ISDN rate digital subscriber line (IDSL), the circuit between the network termination at the customer premises and a D4 channel bank carries data on two combined B-channels. Such a circuit also carries a D-channel and an embedded operations channel (EOC), in normal ISDN fashion. A data service using such a line circuit, however, only transports the data (combined B-channels) through the network. The D-channel and the EOC are not carried through the network. To facilitate testing of the subscriber's circuit, the carrier operations and testing facilities transmit loop-back commands or the like in band to the channel bank. A command may be addressed to any active node along the subscriber's DSL circuit. The line card serving the subscriber in the channel bank detects the commands, removes the commands from the in-band data and reformats the commands for transmission over the EOC channel. The line card addresses the commands and sends the EOC format commands over the DSL circuit to the appropriate node along the subscriber's line. In response, the node connects the circuit in a loop-back mode, to enable test signal transmission and analysis.

Disclosed herein are apparatus, methods and computer program products providing sub-channel re-assignment performed by a relay node in a wireless communications system. In the apparatus, methods and computer program products, a relay receives an input signal made up of a plurality of sub-channels. The relay de-multiplexes the sub-channels into a plurality of signal streams, and reassigns at least one of the signal streams to a new sub-channel on the output side, the new sub-channel on the output side different from the sub-channel originally containing the signal stream on the input side. In one embodiment of the invention, the wireless communications system is an OFDM system and the sub-channels correspond to OFDM sub-carriers. In another embodiment of the invention, during sub-channel reassignment input sub-channels are matched to output sub-channels sharing a pre-determined criterion.

An embodiment of the invention discloses a sidelink buffer status report generation method. The method comprises the steps of uploading a terminal identification and / or a target group identification to a base station, and receiving service priorities sent from the base station and a mapping table of logic channel bank identifications, wherein the mapping table is corresponding to the terminal identification and / or target group identification, and a cell identification corresponding to the terminal identification; acquiring the target group identification, and acquiring the sizes and service types of buffer data packages sent to the target group identification and service priority of each service type; seeking, according to the mapping table, the logic channel bank identification corresponding to the service priority of the buffer data package sent to the target group identification; and generating the sidelink buffer status report according to the size of the buffer data package sent to the target group identification and the found logic channel bank identification. The invention also discloses a sidelink buffer status report generation device. Through adoption of the sidelink buffer status report generation method and device, the resource utilization rate can be improved.

According to the invention, signalling of the used common channels is carried out implicitly via the data rate. Several combinations of channels (spread codes) are only permitted as an alternative for particular data rates of the individual services. Transmission capacity is saved since it is not necessary to reserve individual bits inside the TFCI parameter uniquely for the allocation of said common channels to different connections. The invention is especially useful in the downlink of the FDD modus of UMTS mobile radio systems.

A single switch fabric-based, multi-channel bank digital subscriber line access multiplexer includes a master channel bank containing a master switch module in which the switch fabric and a downstream-directed traffic scheduler reside, and one or more expansion channel banks that are linked with the master channel bank by way of upstream and downstream communication links. Distributed among the channel banks are respective policing mechanisms and cell rate control mechanisms that control upstream-directed communications from line card ports of each expansion channel bank to the switch fabric. Downstream data transmissions are locked to network timing, and are scheduled by a centralized scheduling mechanism resident in the master channel bank.

A novel apparatus for and a method of optimized data transmission whereby an input data stream is distributed over a plurality of physical channels within a logical channel group. Transmission of data over the channel group appears as transmission over a single logical channel having a bandwidth approximately equal to the sum of the physical channel bandwidths. The physical channels making up the logical channel group may have different bandwidth capacities. The method of data unit distribution among a plurality of physical channels generates several transmission plans for scheduling data units, which may have difference lengths, over the physical channels where the data stream is composed of data units from different sessions. A best plan according to one or more optimization criteria is selected and used for distribution of the data units. The original order of transmission of the data units can be reproduced for each data session at the receiving side without the need for additional fields or modification of existing fields of the data units.

An ultrasonic measuring apparatus includes an ultrasonic transducer device having a substrate and an ultrasonic transducer element array that has a first channel group and a second channel group that are arranged on the substrate, a first integrated circuit apparatus that is mounted on the substrate, at one edge portion of the ultrasonic transducer element array in a first direction, such that a long-side direction coincides with a second direction that intersects the first direction, and performs at least one of signal transmission to the first channel group and signal reception from the first channel group, and a second integrated circuit apparatus that is mounted on the substrate, at the other edge portion of the ultrasonic transducer element array in the first direction, such that the long-side direction coincides with the second direction, and performs at least one of signal transmission to the second channel group and signal reception from the second channel group. In the ultrasonic transducer element array, the first group of channels and the second group of channels are arranged alternately every channel in the second direction.

The invention discloses a soft isolation zone method for slope protection at the bank zone and surface source pollution control. The method is characterized in that a soft isolation zone is arranged at the bank and mainly comprises an isolating groove and a soft aggregate ecological slope surface; the isolating groove is used for stagnating and isolating pollutants, and the ecological slope surface is used for water and soil conservation, and pollutant filtration and absorption. The method is mainly applicable to the channel bank slope with lower water content in soil, the dry and cold weather conditions can be overcome, the germination and growth of grass seeds are enhanced, a protecting slope can be greened in shorter time, and the functions for beautifying the landscapes and restoring the ecological system are obvious.

A computerized monitoring apparatus processes signals representing (a) incident power I2 to an antenna, (b) reflected power R2, radiated power T2, and arc voltage power A2. The monitor provides warning of arcing or overheating in the feedlines to (and inside) the antenna before catastrophic failure. Early warning of developing failures allows for orderly transition to standby transmission and avoids losing on-air time. The monitoring apparatus also provides a failsafe indication of whether power is delivered to the antenna and whether the antenna radiates the power delivered to it. Such failsafe indication is required before personnel are allowed near the antenna. The apparatus measures the relative power density at specified locations near and on the tower, and compares the measured RFR exposure density to that allowable by the Federal Communications Commission. The monitoring apparatus can be applied to multiple transmitters with multiple channel combiners feeding a common antenna connection.

A method is provided for aligning RF signals of a first channel bank and additional channel banks in a test platform. A plurality of correlators is used to correlate a reference code signal carrying a particular code at a particular chip rate with a received code signal carrying the particular code at the particular chip rate from the first channel bank to establish a first timing offset. The plurality of correlators is used to correlate a continuation of the reference code signal with additional received code signals carrying the particular code at the particular chip rate from the additional channel banks to establish additional timing offsets. The first timing offset and additional timing offsets are applied to the first and additional channel banks. The plurality of correlators includes 72 correlators, and a timing offset established in a correlation interval having a shorter duration than a length of the particular code.

The disclosure claims a transmission method and device in WLAN, wherein the method includes: a transmitting STA or a receiving STA performing channel detection and / or channel scanning on a channel of the first channel set and / or the second channel set; if the result of the detection and / or scanning satisfies a preset condition, the transmitting STA and the receiving STA exchanging a reservation message on the channel of the first channel set or the second channel set, wherein the reservation message is configured to reserve a channel of the second channel set for transmission; the transmitting STA transmits a data frame to the receiving STA on the reserved channel of the second channel set; and after receiving the data frame, the receiving STA transmits acknowledgement information of the data frame on the channel of the first channel set or the second channel set.

A method and device for frame sync detection using signal combining and correlation. The method comprises the steps of despreading PN coded signals to provide in-phase I1–In, and quadrature phase Q1–Qn signals, wherein each I1–In and each Q1–Qn signal contains at least one sync bit and n≧2. The at least one sync bit from each I1–In, and quadrature phase Q1–Qn signals are summed to form sums Is1 and Qs1, respectively. The next step provides a reference sync having at least one bit and compares each sum Is1 and Qs1 with the at least one reference bit. The results of each Is1 and Qs1 comparison are accumulated so as to form two accumulates, IA and QA, respectively. Each accumulate IA and QA, is squared to form IA2 and QA2 from which the sum IA2 and QA2 is formed. The sum IA2+QA2 is compared with a predetermined threshold and as a result of the comparison a determination of whether frame sync has been achieved is made.

Provided is a direct memory access (DMA) controller. The DMA controller includes a plurality of channel groups and a channel group controller. Each of the channel groups has a plurality of DMA channels, and the channel group controller controls enablement of the DMA channels in units of channel groups. Herein, the channel group controller enables the DMA channels of at least one of the channel groups in data transmission.

A technique is proposed for performing add / drop operations in an OADM assembly serving an optical network and comprising an add unit and a drop unit. With respect to at least one optical channel assigned to an optical wavelength λ, the OADM assembly is capable of dropping the channel from the network via the drop unit as a first signal, and adding the channel to the network via the add unit as a second signal. According to the technique, the OADM assembly additionally comprises an authentication and control unit ACU for authenticating the at least one optical channel and controlling the OADM assembly. The ACU is authenticates the optical channel by comparing one or more components of the first signal with one or more components of the second signal serving as a reference, and based on the authentication result, makes decisions whether to allow or block the dropping and / or adding of the optical channel.

The invention belongs to the field of ecological repairing of water environments in lake basins and particularly relates to a river channel structure capable of ecologically repairing a river flowing into a lake in lake basins. The river channel structure comprises a river channel base, a river channel bank slope and river channel buffering belts. A layer of vegetation form ecological blanket is laid on the river channel base. Aquatic plants are planted on a river channel bank slope. The river channel bank slope comprises a river channel revetment and a river channel land area side bank, wherein the river channel revetment is a step type revetment and sequentially comprises a first-step ecological embankment, a second-step ecological embankment, a third-step ecological embankment, a fourth-step ecological embankment and a fifth-step ecological embankment from bottom to top. Terrestrial plants and herbaceous plants which are reasonably matched are planted on the river channel buffering belts, and the river channel buffering belts include the first buffering belt, the second buffering belt and the third buffering belt. The river channel structure is simple in structure and low in construction cost, the ecological environment of the river flowing into the lake in the lake basins can be repaired, the water quality of the river is improved, the ecological system of the river is recovered, and the self-cleaning capability of the river is improved.

The invention discloses a river channel ecological bank slope protective system which comprises a reverse filtering pad and a protective pad sequentially paved on a river channel bank slope; an anchoring device is utilized to fix the protective pad and the reverse filtering pad on the bank slope; the protective pad is formed through weaving longitudes and wefts perpendicular to each other and comprises a plurality of structural units arranged regularly; each of the structural units takes the shape of a rectangular pyramid; every two adjacent structural units are mutually joined through corresponding bottom edges; the pyramid vertex of each of the structural units is a supporting part leaned against the surface of the bank slope; and the bottom edge of each of the structural units is a buffering part relatively far away from the surface of the bank slope. The river channel ecological bank slope protective system is suitable for ecological restoration of the ecological bank slope and thehydro-fluctuation belt of rivers and lakes, can effectively reduce erosion of water surface waves, ship waves, stormy waves, rainfall runoff and the like to the bank slope and the hydro-fluctuation belt, permanently protects the natural ability of soil from erosion and enables the ecological system of the bank slope or the hydro-fluctuation belt to evolve to the natural state.

The invention discloses a slope protection structure with enhanced diversion, filtering and ecological sewage interception effects. Multiple stages of diversion trenches are sequentially arranged at intervals along a river channel bank slope from top to bottom; the diversion trench of the previous stage and the diversion trench of the next stage are connected through a diversion channel; the diversion channels of the diversion trenches of the adjacent stages are horizontally staggered, and a staggered distance is at least 10 m; a rainwater inlet is arranged in the top of the diversion trench of the first stage; a mesh cage filled with cobblestones is laid on a part, which is not provided with the diversion trench and the diversion channel, on the river channel bank slope; biological ceramsite and gravel are placed in the diversion trenches of the upper half part of the river channel bank slope; biological ceramsite and coarse sand are placed in the diversion trenches of the lower halfpart of the river channel bank slope; green plants are planted in each stage of diversion trench; and meanwhile, the invention further discloses a slope protection system with the enhanced diversion,filtering and ecological sewage interception effects. The system comprises a plurality of crescent array diversion, sewage interception and purification groups which are arranged at intervals in a water channel along a water flow direction. The structure and the system have the enhanced diversion, filtering and ecological sewage interception effects.