Abstract: A method, apparatus and computer program product for the express forwarding bypass are presented. A timer (NAV) is maintained at each respective node of a wireless LAN, the timer (NAV) set to a corresponding time period during which the respective node must refrain from transmitting on a channel. The first node of said plurality of nodes has a time-critical (TC) frame. The first node detects a frame to be express-forwarded by a second node. The first node decrements the duration field by a first predetermined time increment (DT0) before setting its NAV. The first node attempts transmission of the TC frame or back off countdown when the NAV of said first node expires.

Abstract: A radio communication network having at least two base stations. The base stations communicate with mobile stations using time slots. The time slots are divided into transmission slots, during which the base stations transmit messages, and receiving slots, during which the base stations receive messages. The base stations jointly determine an assignment of the time slots as transmission slots and receiving slots.

Abstract: There is provided a method of method of estimating a quality of a signal, the method in a first device comprising measuring a signal transmitted from a second device to a third device; determining a value of a metric from an autocorrelation function of the measured signal; and determining an estimate of the quality of the signal from the determined metric.

Abstract: A method and a system is disclosed for providing quality of service (QoS)-driven channel access within a basic service set (BSS) in a wireless local area network (WLAN). A contention control (CC) frame is sent from a point coordinator (PC) of the BSS during a contention-free period (CFP) of a superframe that includes the contention-free period (CFP) and a contention period (CP). The CC frame contains information relating to at least one of a priority limit for a next centralized contention interval (CCI), a length of the next CCI, a permission probability associated with the next CCI and information relating to a reservation request (RR) frame successfully received by the PC in a previous CCI. A non-colliding RR frame is then received at the PC in the CCI following the CC frame. The received RR frame is sent from a non-PC station in the BSS when at least one centralized contention opportunity (CCO) is available during the CCI after the CC frame.

Abstract: A method for establishing wireless communication between a transmitter and a receiver in a wireless communication system is disclosed. The receiver includes an adaptive array that has at least two antennas. Each antenna receives a signal and produces a received signal. The transmitter includes at least two transmission channels for communicating the signal from the transmitter to the receiver. The wireless communication system suppresses interference at the receiver by applying an interference suppression technique when combining the received signals. The selection of a channel at the transmitter is based on the channel performance at the receiver for each transmission channel. The channel performance is based on a combining technique different from the interference suppression technique.

Abstract: It is described a communication end device comprising (a) a radio transceiver comprising a receiver for receiving radio signals from a transmitting network entity of a cellular telecommunication network and a transmitter (110, 120, 130) for transmitting radio signals to a receiving network entity of the cellular telecommunication network, (b) a further receiver (140) for receiving a further radio signal, and (c) a control circuit (150, 162, 164), which is coupled to the radio transceiver and to the further receiver (140). The control circuit (150, 162, 164) is configured for generating a control signal for controlling the operation of the further receiver (140). Thereby, the control signal is based on a synchronization signal being related to a time dependent transmission scheme of the transmitter (110, 120, 130) and on an information about the current operational state of the radio transceiver.

Abstract: The present invention provides a receiver, a transmitter, a transmitter feedback device, and corresponding methods. The feedback device includes: a multi-channel frequency selection band-pass circuit, configured to receive a multi-frequency band feedback signal, and output a feedback signal of each frequency band in a time-division manner; a feedback local oscillator, configured to provide feedback local oscillation corresponding to each frequency band in a time-division manner; a mixer, configured to mix the feedback signal of each frequency band from the multi-channel frequency selection band-pass circuit and the feedback local oscillation corresponding to each frequency band from the feedback local oscillator, and output an intermediate frequency signal of each frequency band in a time-division manner. A solution in which only one set of signal processing channels is used to process the signals of multiple frequency bands in the uplink, the downlink or both the uplink and downlink is provided.

Abstract: In a method, modulator, transmitter and receiver, the modulator of data signals to be transmitted simultaneously to at least two receiving mobile stations in the same transmission time slot is adapted to select rotational angle of a QPSK transmission modulation, such as a hybrid ?-QPSK modulation used to modulate the data signals to the at least two mobile stations in response to the capabilities of the mobile stations that share the same transmission slot.

Abstract: This document discloses one or more systems, apparatuses, methods, etc. for detecting a region (e.g., sub-meter) of interest (ROI) using radio signals. In an implementation, during training stage, multiple channel fading profile samples within a user defined ROI are received and stored in a portable device. During detecting stage, the portable device may implement a sub-meter ROI detection algorithm to perform the detection.

Abstract: Apparatus, and an associated method, that facilitates communication of data in a radio communication system that utilizes a slotted communication scheme. Multiple successive time slots are allocable upon which to communicate data to a receiving communication station. At selected intervals, a controller causes the mode of operation of the receiving communication station to be changed to pause operation in a receive mode and, during the pause, to cause operation of the receiving communication station to transmit data, such as control acknowledgments or other responses.

Abstract: A method of adaptive uplink/downlink timeslot assignment includes determining at least one of a potentially interfering cell which potentially interferes with a particular cell. A timeslot for uplink communication is eliminated, if a first one of the potentially interfering cells uses that timeslot for downlink communications. A timeslot for downlink communication is eliminated if a dynamic interference measurement in that timeslot as measured by most users exceeds a predetermined threshold and if a dynamic interference measurement in that timeslot does not exceed the predetermined threshold for most users but exceeds the predetermined threshold for at least one user. A timeslot is assigned to an uplink communication of the particular cell using non-uplink eliminated timeslots, and a timeslot is assigned to a downlink communication of the particular cell to each user using non-downlink eliminated timeslots with respect to that user.

Abstract: A method, a device, and a system for duplex communications. Uplink and downlink frequencies are allocated in an orthogonal manner such that at one time instant a certain carrier frequency is used for uplink (downlink) transmission and at some other time instant for downlink (uplink) transmission. Correspondingly, at said one time instant a second carrier frequency is used for downlink (uplink) transmission and at said some other time instant optionally for uplink (downlink) transmission.

Abstract: Systems and methodologies are described that facilitate improved management of a system information modification in a wireless communication environment. Various techniques can be utilized as described herein to provide respective users with information indicative of changes to specific blocks or elements within a set of system information, thereby simplifying and accelerating acquisition of new system information after a modification. In a first example, a bitmap is generated and transmitted upon a system information modification that indicates which blocks(s) and/or element(s) of the system information changed in the modification, thereby allowing an associated user to abstain from reading or processing unchanged system information.

Abstract: A fast turn on compensation system for a synthesized signal source includes a synthesized signal source coupled to a power supply and configured to generate a phase stable radio frequency (RF) output signal. A mute amplifier is coupled to the synthesized signal source and the power supply. A dummy amplifier is coupled to the mute amplifier and the power supply. A mute controller is coupled to the mute amplifier and the dummy amplifier, the mute controller is responsive to an enable signal and configured to enable the dummy amplifier and disable the mute amplifier when no RF output signal is being generated and disable the dummy amplifier and enable the mute amplifier when the RF output signal is being generated such that total power supply current delivered to the synthesized signal source and the dummy amplifier or mute amplifier is approximately constant before, during, and after enabling the mute amplifier to reduce phase disturbance of the RF output signals.

Abstract: Disclosed herein is a power amplifier for time division multiple access. The power amplifier for time division multiple access includes: power amplifiers power-amplifying input transmission signals and outputting the amplified signals; a power control unit using a time division multiple access type to control amplification of the power amplifiers; a switching unit formed at output terminals of the power amplifiers and the power control unit and outputting the amplified signals to an antenna based on a switching pass determined by the power control unit; and a timing control unit formed at an input terminal of the power control unit and determining turn-on time of a second signal by a level of an output signal generated by comparing a first signal with reference voltage.

Abstract: A method and device for service time division multiplexing as well as a method and a device for transmitting service are disclosed. The method for service time division multiplexing includes: selecting a part or all of radio frames in one time unit as specific radio frames; and selecting a part or all of subframes in the specific radio frames as specific subframes for sending a specific service. The specific service is a multimedia broadcast multicast service, or a unicast service, or one or more than one kind of services transmitted in broadcast or multicast mode.

Abstract: Method and arrangement in a first base station for scheduling in a TDD wireless network, which wireless network comprises the first base station serving a user equipment, and a second base station. The method comprises detecting that the second base station uses a different TDD configuration, instructing the user equipment to provide a signal strength measurement report based on a signal received from the second base station, receiving the measurement report, and allocating resources to the user equipment based on the received measurement report. Thereby is allocation of resources in TTIs not having the same uplink-downlink direction in the first base station and the second base station respectively, is avoided for the user equipment, when the received signal strength measurement report indicates that such allocation is appropriate. Also, a method and arrangement in a user equipment for scheduling in a TDD wireless network is described.

Abstract: A method for requesting a bandwidth by a message having a variable format is disclosed. The method includes determining a bandwidth request type according to a size of an uplink bandwidth requested by a mobile station, generating a bandwidth request message having a header format according to the determined bandwidth request type, and transmitting the bandwidth request message to a base station. The determined bandwidth request type is one of a bandwidth request per connection, a bandwidth request per Quality of Service (QoS), and a bandwidth request per mobile station.

Abstract: In general, a mobile unit for communicating with other mobile units assigned to a group within a Multipoint Voice Network (“MVN”) having a plurality of groups is shown. The mobile unit may include a time division multiple access (“TDMA”) transmitter, a TDMA receiver, and a controller. The TDMA transmitter is enabled to transmit a set of multiple carrier frequencies, where the TDMA transmitter is configured to transmit on one frequency chosen from a sub-set of multiple carrier frequencies from the set of multiple carrier frequencies. The sub-set of multiple carrier frequencies corresponds to the group to which the mobile unit is assigned. The TDMA receiver is configured to receive and demodulate the sub-set of multiple carrier frequencies and the controller configures the TDMA receiver to receive and demodulate the sub-set of multiple carrier frequencies that is assigned to the group. A switch may be utilized to set time slots for the TDMA transmitter and the TDMA receiver.

Abstract: In various embodiments, a method for receiving synchronization signals of a mobile radio network is provided. The method may include communicating, by using a transmitting/receiving device for mobile radio signals, with a mobile radio network via a dedicated communication link; and receiving, by using the transmitting/receiving device, synchronization signals of another mobile radio network during a transmission gap in the dedicated communication link, the transmitting/receiving device not being set up for receiving signals of the other mobile radio network independently of the dedicated communication link.

Abstract: Systems and methods of decoding data streams and conserving power are described. In some embodiments, a stream of data containing audio and other data is divided into a plurality of timeslots. A first timeslot of the plurality of timeslots is allocated to a first service. A grant allocation message which indicates a location of the first timeslot allocated to the first service is generated. The grant allocation message and the plurality of timeslots are transmitted to a receiver. The transmission system and receiver may be compatible with NRSC-5. The receiver may receive and decode the grant allocation message to identify OFDM symbols that carry information regarding the first service. The receiver may also receive the plurality of timeslots. The receiver may set a power mode of a component during OFDM symbols that indicate a status of the first service.

Abstract: The present disclosure provides a method and system for implementing synchronization among micro-base stations, including: a micro-base station intercepts a wireless reference signal of an air interface, and selects a synchronization reference object according to an intercepted wireless reference signal; and the micro-base station implements synchronization processing through detecting the wireless reference signal of the selected synchronization reference object, and adjusts its own synchronization information. The method for implementing synchronization among micro-base stations disclosed in the present disclosure is implemented on the basis of the wireless air interface signals of the micro-base stations, requires no additional synchronization hardware devices (such as Global Positioning Satellite (GPS) receiving apparatus, etc.) and has low cost.

Abstract: A relay node (or relay station) operates as an intermediary entity in a transmission between a base station and a mobile station based on its position in a cell and the mobile station's position in the cell. Since the cell is divided into multiple regions and different wireless resources are used in the multiple regions, the relay node employs the relevant wireless resources to be used in the communications based on positions of the relay node and the mobile station. When the relay station and the mobile station are both in the boundary region, it is possible to avoid interference in the relay station by adapting a relay mode that uses a boundary frequency avoiding interference with adjacent cells for both an uplink and a downlink and demultiplexes a relay link and an access link in a time direction for each of the uplink and the downlink. Similar adaptations are made when the mobile station and the relay station are in various positions within a center cell region and boundary cell region.

Abstract: A method and an apparatus of receiving data in a wireless communication system are provided. The method includes detecting a physical downlink control channel (PDCCH) on which control information is transmitted in a first subframe, and receiving data in at least one second subframe based on the control information.

Abstract: The invention provides a method for resolving data conflicts and a mobile communication terminal. The embodiment about the method of the invention includes: a mobile terminal determining a time slot in a frame i for receiving a first data block; if a second data block needs to be received in the frame i, the mobile terminal determining a relationship between the time slot for receiving the first data block and a time slot for receiving the second data block; and if the time slots for receiving the first data block and the second data block are not the same and not adjacent, the mobile terminal receiving the first data block and the second data block sequentially according to the time slots in the frame i. The embodiment of the invention further provides a mobile terminal for implementing the method described above. The invention could receive multiple data blocks in a frame i and decrease the number of data blocks being discarded.

Abstract: A sensor enhanced communication device (200) is provided with a wake mode, a standby mode and sleep mode. The sleep mode is a periodic occurrence within the standby mode which places a cluster of sensors and transducers (202) into a state of arousal in which the sensitivity of the transducers and sensors is increased while the sampling rate is decreased. Incremental learning can occur during the sleep mode as well as basic memory transfers. Since the cluster does not have to re-acquire information upon entering wake mode, the overall power efficiency is improved.

Abstract: The present disclosure discusses devices, methods, and systems for improving signaling. This can occur, according to some implementations, by increasing a power of at least one signaling channel if errors on the signaling channel occur, comprising tracking quality of the at least one signaling channel, determining whether the at least one signaling channel has an error rate that is above a threshold, and increasing power to the at least one signaling channel if the error rate is above the threshold. Other aspects, embodiments, and features are also claimed and described.

Abstract: Determining and configuration a transmission period for a communication device may include transmitting measurement data to measure a relay period of a relay device in the network, where the relay period corresponds to an interval of relaying data to another communication device configured to connectable to network. Additionally, the communication device may receive result data indicative of the relay period of the relay device in response to the measurement data from the other communication device, determine the transmission period at which the communication device transmits data to the other communication device based on the relay period, and transmit data to the other communication device via the relay device based on the determined transmission period.

Abstract: A method of power saving for a wireless transceiver (FIGS. 1 and 2) is disclosed. The transceiver has an active power mode (504) and a reduced power mode (510). The transceiver is operated in the reduced power mode (510) and monitors transmissions from a remote wireless transmitter while in the reduced power mode. The transceiver identifies a transmission from the remote wireless transmitter by a transceiver identity included in the transmission (FIG. 6, UE identification). The transceiver transitions to the active power mode (512) in response to identifying the transmission.

Abstract: A wireless terminal measures the received power of a tone corresponding to an intention base station null output, measures the received power of pilot signals, and determines a signal to noise ratio of the received pilot signal. The wireless terminal calculates a downlink signal to noise ratio saturation level representative of the SNR of a received downlink signal that the wireless terminal would measure on a received signal transmitted by the base station at infinite power. The calculated downlink signal to noise ratio saturation level is a function of the determined interference power, the measured received pilot signal power, and the determined pilot signal SNR. A report is generated corresponding to one of a plurality of quantized levels, the selected quantized level being the closest representation to the calculated downlink signal to noise ratio saturation level. The generated report is communicated using a dedicated control channel segment in a predetermined uplink timing structure.

Abstract: In general, a method performed on a portable access terminal operating in an active mode includes detecting a presence of a personal base station. An encoded identification message transmitted from the personal base station is received, and the encoded identification message includes a unique identifier associated with the personal base station. The encoded identification message is decoded to extract the unique identifier, and the unique identifier is transmitted to a source network entity.

Abstract: Disclosed are a data transmission method and device in a carrier aggregation system, used for realizing the data transmission of UE which does not support uplink and downlink transmission simultaneously in a carrier aggregation system which uses different TDD uplink and downlink configurations. The data transmission method in a carrier aggregation system provided in the present application includes: an eNB performing data transmission with specific user equipment (UE) according to the time division duplex (TDD) uplink and downlink sub-frame configuration employed by a specific component carrier in a carrier aggregation system by means of a component carrier in the carrier aggregation system, wherein said specific UE is TDDUE which does not support simultaneously performing uplink data transmission and downlink data transmission in an identical sub-frame.

Abstract: A method for indicating and interpreting robust MAC signaling, the indicating method having the steps of: checking whether a MAC-PDU contains control information; and if yes, providing an indication to use a robust configuration for a HARQ feedback transmission, and the interpreting method having the steps of: receiving a MAC-PDU; checking whether an indication for robust HARQ feedback transmission is provided; and if yes, utilizing robust HARQ feedback transmission.

Abstract: The invention relates to a method for activating and maintaining a plurality of separate and distanced functional units in an aircraft cabin. According to the invention, a wireless network comprising a plurality of nodes is initialized, wherein each node is associated with a device wherein said initializing comprises associating each node a sending time slot within a time frame using a TDMA synchronization scheme, wherein each node is active to send signals during its sending time slot and is active to receive signals during a first set of time slots comprising a number of time slots of said frame, wherein the sending time slot of a node is different from the sending time slots of at least a plurality of its neighbored nodes.

Abstract: A system and method for hybrid FDM (frequency division multiplexing)-CDM (code division multiplexing) structure for single carrier control channels is provided. The hybrid FDM-CDM structure maximizes frequency diversity over the entire available bandwidth such that orthogonality between signals from users in a given cell is maintained. Thus, users in the given cell can transmit over a non-contiguous set of tones. Furthermore, the hybrid FDM-CDM structure maintains orthogonality of a pilot of users in different cells based on a despreading operation in the time domain.

Abstract: The present invention describes a method for configuring a measurement report type to be used by a receiver to report a measurement to a transmitter, wherein the measurement is reported to the transmitter in a report signal over a control channel, said method comprising selecting a first measurement report type and at least one second measurement report type to be used by the receiver to report the measurement, generating a measurement reporting pattern defining an occurrence of the first measurement report type and the at least one second measurement report type in the report signal transmitted by the receiver to the transmitter over control channel, and notifying the first measurement report type, the at least one second measurement report type, and the generated measurement reporting pattern to the receiver.

Abstract: There is disclosed a wireless communication apparatus that does not interrupt synchronous communication but can continuously perform the synchronous communication even when an address duplication occurs between the local wireless communication apparatus and a nearby wireless communication apparatus. A plurality of wireless communication apparatuses constitutes an ad hoc network system where they transmit beacons to each other. In the wireless communication apparatus, an address processing part (145) generates a first address, which includes a beacon period slot number corresponding to the position-on-beacon-period of a beacon generated by the local wireless communication apparatus, and a second address assigned at random. A beacon processing part (140) determines whether the second address generated by the address processing part (145) is coincident with a second address at another wireless communication apparatus.

Abstract: A method and apparatus for a wireless communication system, using a repetition factor to determine how many times a acknowledgement should be repeated in response to receiving a first data transmission, selecting an acknowledgement transmission (ACK TX) pattern, wherein the ACK TX pattern comprises of resources information of a plurality of blocks used for transmitting the first acknowledgement, and transmitting, repeatedly, the acknowledgement according to the ACK TX pattern.

Abstract: An embodiment of the present invention provides an apparatus, comprising a network adapter capable of combining more than one wireless communication technology (comm) for wireless communication in a wireless network, wherein the apparatus includes a network detection phase implemented by doing a full scan of one comm followed by one or more additional comm scans; and wherein the network adapter breaks a scan into buckets, and alternates between different scanning buckets of different comms to provide faster scanning, connection time and handover from one wireless technology to another wireless technology.

Abstract: A frequency band is divided into N subchannels. Sub-channels are first allocated for a power line communication system having a higher priority, such as public communication or the like. Sub-channels for a power line communication system having a relatively low priority, such as in-home communication or the like, are allocated from free subchannels. In this case, the subchannels used by the power line communication system having the high priority are limited to a plurality of consecutive subchannels from an upper side or a lower side of the frequency band.

Abstract: The disclosure discloses a method and a system for scheduling frequency physical resources based on frequency hopping. The method comprises: in two time slots of frequency hopping transmission, reserving frequency physical resources for an activated semi-persistent scheduling new transmission user with a transmission period reached and a retransmission user; obtaining a scheduling type of a user required for scheduling, and according to an occupancy situation of the frequency physical resources, obtaining corresponding available frequency physical resources when employing a frequency-selective scheduling type and a non-frequency-selective scheduling type; and according to the scheduling type of the user required for scheduling, searching for corresponding available frequency physical resources, and allocating the frequency physical resources to a frequency-selective scheduling user and a non-frequency-selective scheduling user simultaneously during one scheduling period.

Abstract: Synchronized UWB piconets for SOP (Simultaneously Operating Piconet) performance. A common backbone (either wired or wireless) is employed that provides a common CLK (clock signal) to all of the various PNCs (piconet coordinators) of various piconets that may operate within a sufficiently close region such that interference could undesirably occur. By providing a very reliable CLK signal from a common backbone to all of the PNCs of the various piconets operating within a substantially close proximity to one another, very precise synchronization may be ensured for all of the communications performed therein. The various piconets may then even operate using TDMA (Time Division Multiple Access)—whose performance would be substantially compromised without effective synchronization. In addition, combined TFC (time frequency code) and TDMA may also be employed to support the communications therein thereby providing even another degree of orthogonality that provided by TDMA alone.

Abstract: Various methods and systems are provided for allocating time-frequency resources for downlink (DL) and uplink (UL) communications between base stations and mobile stations. Different forms of resource allocation messages including combinations of bitmaps and bitfields provide additional information about the resources and/or how they are assigned. In some implementations the resource allocation messages enable reduced overhead, which may ultimately improve transmission rates and/or the quality of transmissions.

Abstract: A demodulator can include an ingress exciser configured to remove ingress noise from a burst mode digital input signal that is above a predetermined threshold and resides within a narrowband. An adaptive equalizer can be configured to adaptively equalize an estimate of the signal provided from the ingress exciser and to provide an adaptively equalized signal. An ingress predictor can be configured to subtract an estimate of remaining predicted ingress noise from the adaptively equalized signal to provide a resultant signal that is substantially free of the ingress noise.

Abstract: A method and apparatus for multiplexing frequency hopping in a wireless communication system using Orthogonal Frequency Division Multiple Access (OFDMA) is provided. The frequency hopping multiplexing method and apparatus efficiently indicates time division multiplexing for global hopping and local hopping by indicating and using the number and positions of slots for global hopping and local hopping to time-division-multiplex global hopping and local hopping in a reverse link, depending on information the number of Distributed Resource CHannels (DRCHs), provided from a transmitting side over a Forward link Secondary Broadcast Control CHannel (F-SBCCH), which is one of the forward common channels.

Abstract: A wireless device comprises a first wireless transceiver, a second wireless transceiver, and control logic. The control logic is coupled to the first wireless transceiver and the second wireless transceiver. The control logic is configured to determine whether to transmit protection frames (e.g., clear-to-send 2 self frames) based upon sequence numbers in frames received from another device.

Abstract: A receiver produces optimal weights for cancelling multipath interference. An SINR measurement module generates SINR measurements corresponding to soft symbol estimates produced by a baseband receiver from a received multipath signal. Each soft symbol estimate is replaced with either a hard estimate or a weighted soft estimate based on how each corresponding SINR measurement compares to a predetermined threshold. The received multipath signal and estimated interference signals generated from the hard symbol estimates and/or the weighted soft symbol estimates are combined to produce interference cancelled signals that may be combined via maximum ratio combining to produce an interference-cancelled MRC signal.

Abstract: There are disclosed a random access method for establishing an individual channel between a radio communication terminal device and a base station device in a short time and a radio communication terminal device executing the random access method. In this device, in step ST320, a RACH sub-channel allocation unit (211) allocates a transmission packet inputted from a replication unit (202) to an arbitrary sub-carrier at the RACH arbitrary time slot at random. In step ST330, an allocation unit (210) judges whether an overlap is generated in the allocation result obtained by the RACH sub-channel allocation unit (211). When the allocation unit (210) judges that an overlap is generated in the allocation result, the allocation unit (210) causes one of the RACH sub-channel allocation units (211) which has caused the overlap to again perform allocation of step ST320. On the other hand, when judgment is made that no overlap is generated in the allocation result, step ST340 is executed.

Abstract: A method for sending a middle pilot is disclosed. The sending method comprises: selecting a middle pilot sequence set; creating a middle pilot subcarrier union; mapping by a base station a middle pilot sequence in the middle pilot sequence set after modulation through an OFDMA or OFDM symbol for transmitting the middle pilot onto a middle pilot subcarrier in a middle pilot subcarrier union corresponding to each transmission antenna, or, mapping by a base station a middle pilot sequence in the middle pilot sequence set through an OFDMA or OFDM symbol for transmitting the middle pilot onto a middle pilot subcarrier in a middle pilot subcarrier union corresponding to each transmission antenna and then performing modulation on the data at the subcarrier. By way of the present invention, the sending of middle pilot sequences is achieved, and the method reduces the periodicity of pilot symbols in the frequency domain and improves downlink performance of user data.

Abstract: An eNodeB in a TDD system (100), comprising first and second transmitters (408-411), a first receiver (302; 402-405), a control unit (306, 416), and means (305, 415) for diverting part of a transmitted signal from the first and second transmitters (408-411) to the first receiver (302; 402-405). The diverting means (305, 415) are connected to the transmitter part via a switch function (308, 418) and the transceiver also comprises a delay component (304, 404. The control unit (306, 416) activates the switch (308, 418) when the output power of the transmitted signals falls below a threshold, and the delay component (304, 404) delays so that the diverted signals are received by the receiver part (303; 402-405) at a predefined point in time. The transceiver (300) comprises a comparison unit (307, 417) for comparing the diverted signals from the first and second transmitters after reception through the first receiver.