Samsung Electronics Co., Ltd.

Qualcomm Incorporated

Kwang-Man Ok

Chae-Man Lim

Min-Goo Kim

Joo-Kwang Kim

Dong-Ryeol Ryu

Seong-Ho Hur

Young-Seok Jung

Sang-Hyo Kim

Bong-Gee Song

Chung-Gu Kang

Hyun-Seok Oh

Young-seok Jung

Soo-bok Yeo

Su-Jin Yoon

Wi-Sang Rho

An apparatus and method for power control are provided. In a receiver in a mobile communication system, a Receive (Rx) signal received through a plurality of antennas is estimated. A power ratio between a traffic channel of the Rx signal and a pilot channel of the Rx signal is determined. A Log Likelihood Ratio (LLR) value is determined using the power ratio between the traffic channel and the pilot channel, a symbol of the traffic channel, and an Rx signal estimation value to which precoding is applied.

Apparatus and method for power control in mobile communication system

Provided is a transmitting/receiving apparatus and method for an IDMA system. The receiving apparatus includes a channel estimator, an estimator, and a determiner. The channel estimator estimates a channel using a multi-user signal received through at least one RX antenna. The estimator estimates the noise power and the signal power for each transmission layer of each user by using the estimated channel value from the channel estimator. The determiner determines the number of transmission layers for each user and an MCS level for each transmission layer by using the signal power and the noise power estimated by the estimator.

Transmitting/receiving apparatus and method for interleaver division multiple access system

An apparatus and a method for selecting a receiver for demodulating a reception signal at a reception end having a plurality of receivers are provided. The method includes determining, a mean and a standard deviation of Signal-to-Noise Ratios (SNRs) of the receivers are determined, estimating a Doppler frequency, determining a statistical value of a modulation order of subframes received in advance, determining SNR estimation values of the receivers based on the determined mean and standard deviation of the receivers, the estimated Doppler frequency, and the determined statistical value of the modulation order of the received subframes, selecting one receiver having a largest SNR estimation value among the determined SNRs of the receivers, and demodulating a reception signal using the selected receiver.

Apparatus and method for receiving signal using rake receiver and equalizer in wireless communication system

An apparatus and method for reporting a Channel Quality Indicator (CQI) in a wireless communication system are provided. The method includes estimating a per-subband CQI with respect to each transport layer and generating a broadband CQI with respect to each transport layer according to the per-subband CQI, comparing the broadband CQI and the per-subband CQI with respect to each transport layer to determine a difference value thereof, determining an offset value to be used in a differential CQI, determining the differential CQI by subtracting the offset value from the determined difference value, and transmitting a transmission symbol by converting the determined differential CQI into the transmission symbol.

Apparatus and method for reporting channel quality indicator in wireless communication system

An apparatus and method for allocating a frequency resource to a user equipment (UE) in an orthogonal frequency division multiplexing (OFDM) mobile communication system. A base station receives feedback information including at least mobility information from the UE, and determines from the mobility information whether the UE belongs to a fast group or a slow group. The base station allocates a frequency resource for the UE according to an open-loop solution if the UE belongs to the fast group, allocates a frequency resource for the UE according to a closed-loop solution if the UE belongs to the slow group, and transmits data for the UE using the allocated frequency resource.

Apparatus and method for allocating frequencies in an OFDM mobile communication system supporting high speed downlink packet access service

A cell search apparatus and method in a mobile communication system. After a UE acquires slot boundary timing and frame boundary timing to a Node B, it acquires its scrambling code number and scrambling code timing. After the initial cell search, the UE performs multi-path search by searching a first area with respect to the scrambling code timing. During reacquisition in a sleep state, the UE searches a second area wider than the first area with respect to a scrambling code timing acquired before the sleep state. The UE performs neighbor cell search by selectively using the initial cell search and the multi-path search according to whether the Node B provides information or what information it provides.

Cell search apparatus and method in a mobile communication system

A transmission and reception apparatus and method for use in a wireless communication system, and an apparatus and method for adaptively transmit and receive a signal according to channel state in a wireless communication system. An apparatus for adaptively performing transmission according to a state of a channel transmitted from a transmitter to at least one receiver includes a signal to interference ratio estimator for estimating a signal to interference ratio of the channel using a signal transmitted from the at least one receiver; and an adaptive transmitter for transmitting data to the at least one receiver on a basis of the estimated signal to interference ratio.

Apparatus and method for estimating a signal power to interference power ratio in a wireless communication system

A cell search apparatus and method in a W-CDMA mobile communication system. The cell search apparatus and method performs a first cell search step, a second cell search step, and a third cell search step using a slot count value and a lower count value, counted by an index counter after being initialized upon power up of a UE (User Equipment), thereby determining a scrambling code for a Node B. Further, the cell search apparatus and method manages neighboring Node Bs by performing a multipath search.

Apparatus and method for generating reference timing in a CDMA mobile communication system

A PN sequence acquisition device for a multicarrier CDMA mobile communication system including M (where M is a natural number) despreaders, each for multiplying BS generated PN sequences included in M carrier receiving signals by a local PN sequence of an nth (1&#x2266;n&#x2266;N, where n and N are natural numbers) time hypothesis in a predetermined integrating period; M correlators, each corresponding to a corresponding one of the M despreaders and each for calculating detection energies depending on correlations between the BS generated PN sequences of the corresponding one of M carrier receiving signals and the local PN sequence of the nth time hypothesis; a combiner for combining the detection energies corresponding to the local PN sequence of the nth time hypothesis for the M carrier receiving carriers; a controller for comparing the combined detection energy of the M carrier receiving signals, output from the combiner, with a threshold value; and N acquisition circuits including an nth local PN generator for providing the local PN sequence of the nth time hypothesis to the M despreaders and shifting a phase of the local PN sequence of the nth time hypothesis by a predetermined value under the control of the controller, whereby PN sequence acquisition is simultaneously performed on N time hypotheses.

Growing community of inventors

Songnam-shi, South Korea

Kwang-Man Ok