Abstract: A receiver for a digital broadcast terminal includes first and second receiving units, each for receiving a digital broadcast signal. Each of the first and second receiving units typically includes an antenna, a tuner, and an analog/digital (A/D) converter. The receiver further includes a control unit configured to determine reception environment based upon the digital broadcast signal, and to selectively operate the first and the second receiving units based upon the reception environment. A method for controlling a digital broadcast receiving terminal includes receiving a digital broadcast signal at first and second receiving units, determining reception environment based upon the digital broadcast signal, and selectively operating the first and second receiving units based upon the reception environment.

Abstract: The present invention provides a method and system for operating a wireless communication system in which received signals from a plurality of antennas are weighted and combined with a beam forming operation to form an output signal. In an embodiment of the present invention, beamforming operations are performed with maximal ratio combining (MRC) and an interference nulling algorithm (INA). The INA receives an error signal which is 180° out of phase with a combination of the channels for individual antennas, referred to as the SUM channel. The error signal is determined by complex conjugate multiplication of the individual signals and a reference complex signal. The weight amplitude is controlled by weight normalization to provide faster convergence and prevent integrator overflow.

Abstract: A signal separation device is disclosed that is able to reduce a number of calculations required when separating a received signal transmitted from transmission devices into the individual transmission signal. The signal separation device includes a signal point derivation unit that multiplies the received signal with respective elements of a unitary matrix, and derives at least one received-signal signal point on a signal constellation diagram; a definition unit that defines plural sections on the signal constellation diagram, each of the sections including a predetermined number of signal points; a detection unit that detects a received-signal section from the sections, the received-signal section including the received-signal signal point; a selection unit that selects signal points in the received-signal section as candidates of the received-signal signal point; and a determination unit that determines the transmission signals based on the selected signal points.

Abstract: To provide a technique for analyzing radio wave condition affording improved accuracy of discrimination of radio wave propagation condition on a per-channel basis. Analyzer device 10 for analyzing the condition of radio waves used for wireless LAN communications comprises a reception portion 410 for receiving radio signals in a plurality of frequency bands; a first strength sensing portion 420 for sensing the field strength RSS1 of the center frequency band on a per-channel basis from a received radio signal; a despreading portion 430 for despreading the received radio signal; a second strength sensing portion 440 for sensing the field strength RSSI2 of the center frequency band on a per-channel basis from the despread radio signal; a discriminating portion 450 for discriminating radio wave condition by cross-checking RSSI1 and RSSI2 on a per-channel basis; and a display portion 460 for displaying the discriminated radio wave condition.

Abstract: Methods and apparatus are described for improving convergence time of a reference signal-to-interference (SIR) value calculated in outer loop power control for use in inner loop power control. Instead of considering only error rate information for each transport channel individually, other information, such as quality information from other transport channels and block rate information for the channel, is also considered to determine the reference SIR. By considering such other information, an improved outer loop power control is achieved, thus reducing the power needed for the physical channel and increasing the capacity of the communication system.

Abstract: A mobile phone includes a controller; a receipt adjusting unit for controlling receipt of the (RF) radio frequency signal and controlling receipt diversity under control of the controller; a first RF signal receiver for converting the RF signal received through the first antenna into a baseband signal to be transmitted to the controller under control of the receipt adjusting unit; a second RF signal receiver for converting the RF signal received through the second antenna into a baseband signal to be transmitted to the controller under control of the receipt adjusting unit; a transmission diversity adjusting unit for controlling transmission diversity under control of the controller; and an RF signal transmitter for converting the baseband signal transmitted from the controller into an RF signal to be transmitted to the first antenna and transmitting the RF signal to the second antenna under control of the transmission diversity adjusting unit.

Abstract: Disclosed is an adaptive transmitting and receiving device and method using frequency division duplexing. A transmitter transmits a preamble or a pilot to a receiver. The receiver estimates a received SNR from the preamble or pilot, determines parameters (received log likelihood ratio parameters) of determining the distribution of the received log likelihood ratio, and feeds them back to the transmitter. The transmitter adaptively determines an antenna method, a modulation method, and a transmit power according to the parameters, and adaptively transmits traffic data to the receiver according to the determined antenna method, the modulation method, and the transmit power.

Abstract: A terminal 211 measures pilot signals transmitted in directional (beam) patterns from an adjacent cell and an own cell, and estimates reception qualities with the presence (high)/absence (low) of the interference from the adjacent cell. The terminal 211 requests data rate request values (DRC1, DRC2) corresponding to the reception qualities with the presence/absence of the interference to the base station 201. The base station 201 shares beam direction schedule with an adjacent cell base station, and confirms the presence/absence of interference to the terminal 211 for each slot. In accordance with the presence/absence of the interference, the base station 201 selects a suitable one of the two values of the data rates requested from the terminal 211, and modulates the data and transmits it.

Abstract: An apparatus comprises a link interface to receive an OFDM symbol from a communications link. A signal-to-noise ratio estimation unit generates an estimate of a geometric signal-to-noise ratio for the received symbol based on a function of the soft and hard decisions. A signal quality of the wireless communications link is based on the geometric signal-to-noise ratio.

Abstract: A method and apparatus of selecting which of a plurality of receiver chains of a mobile unit to receive wireless signals, is disclosed. One method includes measuring a first receive signal quality while all of the plurality of receiver chains are receiving wireless signals, and measuring a second receive signal quality while a subset of the plurality of receiver chains are receiving wireless signals. The subset of the plurality of receiver chains are selected to receive wireless signal unless the first receive signal quality is a threshold better than the second receive signal quality. If the first receive signal quality is a threshold better than the second receive signal quality then all the plurality of receiver chains are selected to receive wireless signals.

Abstract: Embodiments of twin media access control apparatus and methods are generally described herein. Other embodiments may be described and claimed. The present arrangement provides for eliminating a functional media access control unit from one or more processors in a processor/co-processor(s) situation. A dual media access control interface of the processor handles both the network requests of the processor and all co-processors, such as proactive management processors.

Abstract: The invention arranges an auxiliary antenna in the neighborhood of an antenna, and a voltage applied to the auxiliary antenna is changed based on the reception quality of a received signal received by the antenna. Thereby, the reception characteristic of the antenna is changed. Moreover, the optimum antenna is selected among a plurality of arranged antennas based on the reception quality of the received signals received by the plurality of arranged antennas.

Abstract: A method for processing a composite digital audio broadcast signal to mitigate intermittent interruptions in the reception of the digital audio broadcast signal, the method comprising the steps of separating an analog audio portion of the digital audio broadcast signal from a digital audio portion of the digital audio broadcast signal, detecting errors in the digital audio portion of the digital audio broadcast signal, adjusting the digital audio portion of the digital audio broadcast signal in response to errors in the digital audio portion of the digital audio broadcast signal to produce an adjusted digital audio portion, and blending the analog audio portion with the adjusted digital audio portion to produce an audio output. A receiver that performs the method is also included.

Abstract: An apparatus and method for controlling a digital AGC in a communication system in which power changes significantly from frame to frame. In the digital AGC controlling apparatus, an SNR estimator estimates an uplink SNR of a next frame. A power measurer measures uplink received power of every frame. A gain calculator estimates uplink power of an nth frame using an SNR estimate of an (n?1)th frame received from the SNR estimator and a received power measurement of the (n?1)th frame received from the power measurer, and calculates a gain to be applied to the nth frame in the digital AGC using the uplink power estimate of the nth frame.

Abstract: A method for improving the reliability of a channel quality indicator (CQI) message in a wireless communications network begins with receipt of the CQI message. The CQI message is then decoded, and a decision metric value for each symbol in the CQI message is computed. A largest decision metric value and a second largest decision metric value for the CQI message are determined. The reliability of the CQI message can be determined by comparing the two largest decision metric values. This method may be applicable to high-speed downlink packet access in time division duplex, frequency division duplex, or other modes of transmission.

Abstract: A method and apparatus derives an impairment correlation matrix to process signals received at a wireless receiver over multiple paths of a multi-path channel. The receiver includes first and second impairment correlation estimators for estimating first and second impairment correlation matrices based on despread symbols received over multiple paths of a multi-path channel. The receiver then derives the impairment correlation matrix based on the estimated first and second impairment correlation matrices. The receiver may combine traffic despread values to suppress interference using weighting factors calculated based on the derived impairment correlation matrix. Further, the receiver may estimate a signal-to-interference ratio based on the derived impairment correlation matrix.

Abstract: In a MIMO wireless transceiver, priority control that judges priority of transmit data and a transmission mode table are provided to control an option as to which transmission system SDM or STBC is selected, coding rate and modulation method based on a transmission mode for a transmission destination that is determined by priority of transmission data and status of a communication matrix at the time of data transmission. With such arrangement, a wireless communication system composed of the MIMO wireless transceiver can control coding, MIMO signal processing and modulation methods according to priority of transmit data. More specifically, it is possible to ensure transmission of data having higher priority and improve throughput in total when a plurality of types of data are transmitted.

Abstract: A method for controlling diversity receivers in a wireless communication device includes the steps of: determining if the wireless communication device is experiencing poor coverage (220), using a first receiver and a second receiver for diversity (230) if the wireless communication device is experiencing poor coverage, and using the second receiver for scanning (240) if the wireless communication device is not experiencing poor coverage. Thus, diversity can be used when needed to improve reception. Both receivers, however, can be used in a non-diversity mode to reduce current drain or to speed up channel acquisition when coverage is not poor.

Abstract: A method of power control in a 3G wireless communication system (100) incorporating fast forward power control, may include setting an initial base station transmit power boundary (402) and an initial signal-to-noise ratio boundary (502). A mobile station (102) may send a forward link FER measurement to a base station (106). The base station may perform at least one of a base station transmit power boundary adjustment (403) and a mobile station signal-to-noise ratio boundary adjustment (503) based on the forward link FER measurement received from the mobile station, thereby imposing dynamic constraints on the fast forward power control operation.

Abstract: Spreading code detection methods applying autoregressive spectrum estimation (ARSE) techniques to code division multiple access (CDMA) wireless communication systems allowing the subscriber device to estimate the other users' codes. According to one aspect, ARSE techniques are provided using an augmented Wiener-Hopf solution on a received forward link CDMA signal. The ARSE techniques produce a code spectrum transform yielding a power spectral density versus spreading code index relationship from which the spreading codes in the received forward link signal may be identified. According to another aspect, a reduced rank auto-regression (AR) implementation is provided to produce a code spectrum transform efficiently with improved false code detection rate. With knowledge of other users' spreading codes, interference cancellation can be performed on the forward link of CDMA systems.

Abstract: A hybrid time division duplex/code division multiple access communication system comprises a radio network controller coupled to a plurality of Node-Bs. The radio network controller comprises a resource allocation device for providing each Node-B with a list of timeslots that the Node-B can use to assign uplink timeslots and downlink timeslots. The list of timeslots does not include all potential timeslots as being assignable for uplink communications and does not include all potential timeslots as being assignable for downlink communications. Each of the plurality of Node-Bs comprises an assignment device for dynamically assigning uplink and downlink communications to users of the Node-B in response to the assignable uplink and downlink timeslots of the list.

Abstract: Apparatuses and methods for dynamically adjusting carrier sensing threshold levels in a wireless, such as CSMA, system. A station may use the carrier sensing measurement made in normal CSMA operation to determine a threshold level for the local station, and transmit the determined level to other stations in the system. The station also receives similar information from other stations in the system and determines, based at least in part on the information received and the local determined threshold level, an optimal carrier sensing threshold level.

Abstract: A wireless processing section has modulation/demodulation circuits which contain communication protocols used for a plurality of communication systems. A communication control section performs an entering idle state process according to a selected communication mode by a communication processing selection section and executes an entering idle state process by switching communication modes until an entering idle state process is successful. Subsequently, when an entering idle state process is successful, a maximum number of origination retry attempts is determined corresponding to a required time interval until completion of that entering idle state process. Specifically, the maximum number of origination retry attempts is decreased to the extent that the time interval until an entering idle state process completion becomes longer. The communication control section performs retries fore only the determined maximum number of origination retry count attempts when connection failed in an origination process.

Abstract: A system and method for effectively performing a transmit power adjustment procedure in a wireless network includes a forward receiver that monitors a wireless forward link for forward data that is transmitted over the wireless forward link by a forward transmitter. The forward transmitter initially transmits the forward data at a minimum power level, and gradually increases the minimum power level to a power level threshold at which the forward receiver first detects the forward data on the forward link. Once the forward receiver and the forward transmitter are successfully coupled over the wireless forward link, the forward transmitter may then transmit forward data at a normal operating power level. The foregoing transmit power adjustment procedure ensures that the forward receiver receives forward data only from the forward transmitter, and prevents other proximate wireless devices from inadvertently intercepting forward data transmitted by the forward receiver.

Abstract: A broadcast receiver is connected to a variable directional antenna qualified as an antenna capable of modifying a reception direction of a broadcast wave. When arriving at a prestored timing, the broadcast receiver executes channel search utilizing the variable directional antenna on the condition that the tuner is not currently in operation. In the channel search, determination is made whether a broadcast wave is valid for reception for all reception directions by the variable directional antenna with respect to each of all prestored frequencies.

Abstract: A receiver, or base station, may calculate the signal quality improvement based on a change in a diversity control parameter, for example, a phase difference or a power ratio among two or more antennas, by comparing a received signal power level to an expected power level, assuming no change in fading characteristics at the previous timeslot. This method may increase the amount of information communicated between the base station and the mobile unit, and may reduce feedback response time and/or provide for more efficient feedback for transmit diversity systems.

Abstract: The present invention relates to a blind detection of a received signal having at least one property, which initially is unknown to the receiver, however, limited to a finite set of alternatives ({p1, p2, . . . , pm}). According to the invention, the unknown property is automatically identified as follows. A respective quality measure (q1, q2, . . . , qm) is derived from the incoming signal (r(n)), which each represents a particular property in the finite set of alternatives ({p1, p2, . . . , pm}). The quality measures (q1, q2, . . . , qm) are obtained according to a procedure that involves a computationally efficient rejection of any unwanted signal components in the incoming signal (r(n)). Then, the quality measures (q1, q2, . . . , qm) are compared with each other in order to find a quality measure, which best fulfills a blind selection criterion. The quality measure (qi) thus obtained corresponds to the initially unknown property (pi).

Abstract: A wireless communication method and system for controlling the current data bit rate of a radio link (RL) to maintain the quality of the RL. The system includes a core network (CN), a radio network controller (RNC) and at least one wireless transmit/receive unit (WTRU). The RL is established between the RNC and the WTRU. The RNC establishes a guaranteed data bit rate, a maximum data bit rate and a current data bit rate associated with the RL. When the RNC senses an event which indicates that the quality of the RL has substantially deteriorated, the RNC reduces the value of the current data bit rate. Then, in a recovery process, if a similar event does not occur during an established waiting period, the RNC restores the current data bit rate back to the maximum data bit rate.

Abstract: Systems and methods may operate to increase the throughput of a wireless connection by passing a wireless signal from a communications subsystem to an application subsystem for physical layer processing of the wireless signal. Other embodiments include systems and methods for selectively activating a processor of an application subsystem when an improvement in wireless throughput is possible.

Abstract: A method includes monitoring a variable-rate data communication channel to determine its signal-to-noise ratio, and adjusting the data transmission rate of the variable rate data communication channel based on its signal-to-noise ratio.

Abstract: A receive system, including special integrated circuits, for providing enhanced directivity in the form of a narrowed receive beam and a relatively small antenna with performance comparable to a much larger antenna at similar frequencies. Received signals are converted to digital values and stored in a manner which enables subsequent processing directed to improving the resolution of the received signals and to reduce the associated noise corresponding to the received data samples. The Signal-to-Noise ratio of the received data signals is improved as a result of processing techniques made possible by the configuration of the antenna and the digitally stored nature of the received data.

Abstract: A mobile communication system capable of increasing communication efficiency and a method therefor are provided, including a receiver for grouping n MCS levels (where n>0) into continuous m MCS levels (where n>m>0) according to the quality of a data channel for transmitting an information signal, and sending information on an MCS group using a pilot signal, and an ACK or an NACK signal, which indicates whether the information signal is completely received; and a transmitter for storing information on the n MCS levels, extracting the m MCS levels according to the information on the MCS group transmitted from the receiver, determining one of the extracted m MCS levels as an initial MCS level, modulating and coding information data to be transmitted according to the initial MCS level and transmitting the result to the receiver, and changing the current MCS level in response to the ACK or the NACK signal.

Abstract: A comparison circuit 13x compares signals from demodulator circuits 11a and 11b and thereby compares the reception condition of the antennas 1a and 1b. The tuner circuit corresponding to the antenna that is yielding better reception condition selects the channel to be displayed on a main screen, and the tuner circuit corresponding to the other antenna selects the channel to be displayed on a sub screen.

Abstract: A receiving diversity apparatus and method for a mobile station in an HDR mobile communication system measures C/I values of pilot channels on respective antennas, measures a C/I value of in-phase combined pilot channel, and then selectively performs one of a selection diversity receiving operation and an in-phase combining receiving operation according to the measured C/I values. An optimal diversity receiving status is then maintained according to changes of a presently received pilot channel, and the optimal diversity receiving operation between the selection diversity receiving operation and the in-phase combining diversity receiving operation is selected at a starting point of the pilot channel.

Abstract: For measuring the influence of noise on the talking quality of a telephone link in a telecommunications network, a talker speech signal (s(t)) and a degraded speech signal (s?(t)) are fed to an objective measurement device for obtaining an output signal (q) representing an estimated value of the talking quality. The degraded signal includes a returned signal (r(t)) originating from the network during transmission of the talker speech signal over the telephone link. The objective measurement provided by the device is a modified PSQM-like measurement, which is modified to include modelling of masking effects resulting from noise present in the returned signal. Preferably, the modelling includes noise suppression performed on a difference signal (D(t,f)) in a loudness density domain using noise estimation.

Abstract: The present invention aims to provide a radio base station that has equivalently high reception sensitivity without increasing the number of antenna elements while keeping the utilization efficiency of time slots high. The radio base station comprises a radio unit 101 and a radio unit 102. Two time slots, one at each radio unit, are allocated to a mobile station. After a signal transmitted from the mobile station is received and demodulated, a piece of data received by the radio unit 101 is compared with a piece of data received by the radio unit 102 so that one of the pieces of data that has fewer errors is selected.

Abstract: When a radio communication terminal including an AGC receiver starts, a set gain of the AGC receiver is switched in a short updating period. At this time, the terminal switches among antennas, and calculates and stores a received power of a received radio signal through each antennal. This calculation is performed a predetermined number of times for each antenna. After that, the terminal compares the calculated received powers of the radio signal through each antenna, and fixedly uses, as a receiving antenna, one of the antennas which receives a signal with the largest power.

Abstract: This disclosure is directed to techniques for estimating signal-to-noise ratio (SNR) of signals received by a wireless communication device. The techniques take advantage of spatial receive diversity in a wireless communication device to achieve accurate estimates of SNR. In general, a spatial projection wiener filter function can be applied to incoming symbol estimates to support efficient computation of SNR. The estimated SNR can be used to produce power control commands for use in forward power control.

Abstract: A wireless receiving method includes calculating a transmission channel response from a reception signal and a reference signal, determining reliabilities of a plurality of transmission channel responses calculated using reception signals received at different time periods to decide on a weight synthesis method, weight-synthesizing the plurality of transmission channel responses based on the decided weight synthesis method to obtain a synthesized transmission channel response, and compensating a distortion of the reception signal using the synthesized transmission channel response.

Abstract: Device and method for measuring a talking quality of a communication link in a communications network (10). The device comprises measurement means (22; 31, 36) connected to the communication link, which are arranged to subject a degraded speech signal s?(t) with respect to a reference speech signal s(t) to an objective measurement technique for measuring a perceptual quality of means are arranged for producing a quality signal (q) which represents an estimated value concerning the talking quality degradation. The degraded speech signal comprises a returned signal r(t). The measurement means (22; 31, 36) are arranged to execute the objective effects in consequence of noise present in the returned signal. The objective measurement technique comprises the determination of a threshold noise level by determining a local minimum value of the degraded speech signal s?(t).

Abstract: The proposed iterative method concurrently calculates maximum likelihood estimated values for the channel coefficients (h0, . . . , hL; ?h) and the DC offset (d; ?d) on the basis of a training sequence (TSC) in a TDMA mobile communications system. The SAGE algorithm leads to two recursion formulae, by means of which the iterative calculation of estimated values for the channel coefficients (h0, . . . , hL; ?h) and for the DC offset (d; ?d) is provided.

Abstract: Mobile devices are assigned to their correct base stations after taking into consideration interference from all other mobile devices. The resulting assignments are more efficient than previous assignments. In addition, transmit power levels are assigned after each mobile device is assigned to a base station. The assigned power levels allow for more efficient use of power during the transmission of data signals.

Abstract: In a heterodyne receiver, the effect of an image interference signal that occurs in a case where a low intermediate frequency is used is alleviated. Circuits (12I), (12Q), (13I), (13Q), and (14) are provided to switch a heterodyne system between an upper heterodyne system and a lower heterodyne system. The switching circuits (12I) to (14) switch the heterodyne system into one of the upper heterodyne system and the lower heterodyne system with less image interference on the basis of each reception frequency.

Abstract: System and method for managing finger and path resources. A preferred embodiment comprises receiving a delay profile, processing paths from the delay profile, placing the processed paths into a plurality of sets based on path criteria, and assigning the placed processed paths to demodulating fingers. A preferred embodiment further comprises the use of historical information on paths in the placing.

Abstract: The circuit size of a diversity receiver for an orthogonal frequency division multiplexing signal is reduced, and the diversity effect is increased, by providing a power ratio comparator that calculates a difference value as a ratio of powers derived from channel estimation results for subcarrier components received from two antennas (11), (21) and compares the calculated difference value with a predetermined threshold, and a selective/equal gain combining selector (33) that outputs one of the received demodulated signals when the comparison result indicates that the calculated difference value is greater than the threshold value.

Abstract: A CDMA radio device is provided which is capable of reducing a hardware scale and providing more accurate path selection with low power consumptions. A down-sampling part outputs data of which sampling frequency is made lower than A/D sampling frequency. A correlator part performs correlation calculation of the data using specific spread codes designated in cell information to create a delay profile. A first path selection part selects a path in the delay profile and transfers selection information to an up-sampling part. The up-sampling part supplements delay profile data at sampling time that has been lost in the down-sampling part. A second path selection part transfers some location information of ultimately determined paths to a base station spread demodulation unit or a mobile station spread demodulation unit as a path timing signal.

Abstract: Methods and apparatuses, including computer program products, for spatial processing in a remote terminal unit. One embodiment is a wireless remote terminal receiver in a wireless terminal unit for operation in a wireless communication system. The wireless remote terminal receiver includes an antenna array, and a receive processing unit to process signals received by the antenna array by applying a selected spatial processing mode of a plurality of spatial processing modes. The modes include one or more modes of one or more spatial processing methods. The receiver also includes a selector to select the spatial processing mode from the plurality of spatial processing modes. The selecting includes selecting the spatial processing method in the case that the set of spatial processing modes are of more than one spatial processing method.

Abstract: An apparatus determines an optimal antenna and frequency combination by selecting the optimal antenna from among a plurality, N, of antennas associated with a receiver and also selects the optimal frequency from among a plurality, M, of alternative receiving frequencies transmitted from a transmitter. This is achieved by determining all N×M possible antenna/frequency combinations, by determining the received signal quality at each combination, by comparing the N×M received signal qualities, and by selecting the one antenna/frequency combination having the optimal received signal quality.

Abstract: A data monitoring system in communication network has the global position system (GPS) receiver, a packet data collecting device and a mobile station-packet data serving node monitoring system (MPMS). The GPS receiver provides time information which is received from the GPS satellites. The packet data collecting device collects the communication protocol and communication environment information between a base station and a packet data serving node (PDSN), together with the time information provided by the GPS receiver. The MPMS receives wireless communication environment, data communication environment and mobile communication protocol of the mobile station together with the GPS time information, and receives packet data communication environment and data communication protocol of the mobile station from the packet data collecting device together with the time information, and monitors and analyzes on a single time axis.

Abstract: A diversity antenna apparatus has N (N is 3 or more integer) elements of antennas which receive radio signals, a priority storage unit configured to store priority data of the N elements of antennas, a first antenna selector which selects two antennas from among the N elements of antennas based on the priority data, a second antenna selector which selects one of the selected two antennas based on a prescribed condition, and a priority update unit configured to update priority data of the N elements of antennas stored in the priority storage unit based on the antenna selected by the second antenna selector.