Transmission patterns for pilot symbols transmitted from a mobile station or base station are provided. The pattern allows for improved receipt of the pilot symbols transmitted. In addition, schemes for improving the ability to multiplex pilot symbols without interference and/ or biasing from different mobile stations over the same frequencies and in the same time slots.

Pilot signal transmission for an orthogonal frequency division wireless communication system

Apparatuses and methodologies are described that enhance performance in a wireless communication system using beamforming transmissions. According to one aspect, the channel quality is monitored. Channel quality indicators can be used to select a scheduling technique, such as space division multiplexing (SDM), multiple-input multiple output (MIMO) transmission and opportunistic beamforming for one or more user devices. In addition, the CQI can be used to determine the appropriate beam assignment or to update the beam pattern.

Channel quality reporting for adaptive sectorization

Methods and apparatuses are disclosed for providing flexible channel information feedback. In some cases this may be according to reporting types assigned by one or more sectors, with different reporting types for each sector. In other cases, a reporting mode is determined to determine the reporting types to be utilized.

Systems and methods for control channel signaling

A channel structure has at least two channel sets. Each channel set contains multiple channels and is associated with a specific mapping of the channels to the system resources available for data transmission. Each channel set may be defined based on a channel tree having a hierarchical structure. To achieve intra-cell interference diversity, the channel-to-resource mapping for each channel set is pseudo-random with respect to the mapping for each remaining channel set. In each scheduling interval, terminals are scheduled for transmission on the forward and/or reverse link. The scheduled terminals are assigned channels from the channel sets. Multiple terminals may use the same system resources and their overlapping transmissions may be separated in the spatial domain. For example, beamforming may be performed to send multiple overlapping transmissions on the forward link, and receiver spatial processing may be performed to separate out multiple overlapping transmissions received on the reverse link.

Channel structures for a quasi-orthogonal multiple-access communication system

Systems and methods for decoding block and concatenated codes are provided. These include advanced iterative decoding techniques based on belief propagation algorithms, with particular advantages when applied to codes having higher density parity check matrices. Improvements are also provided for performing channel state information estimation including the use of optimum filter lengths based on channel selectivity and adaptive decision-directed channel estimation. These improvements enhance the performance of various communication systems and consumer electronics. Particular improvements are also provided for decoding HD Radio signals, including enhanced decoding of reference subcarriers based on soft-diversity combining, joint enhanced channel state information estimation, as well as iterative soft-input soft-output and list decoding of convolutional codes and Reed-Solomon codes. These and other improvements enhance the decoding of different logical channels in HD Radio systems.

Systems and methods for advanced iterative decoding and channel estimation of concatenated coding systems

A priority computation process computes a priority of each user for each RB (Resource Brock) using a reception SINR. A maximum priority user selection/RB allocation process selects a user with the maximum priority for an unallocated RB and allocates the RB to the user. A frequency axis/space axis unallocated RB presence determination process proceeds to scheduling for a next user if there is an unallocated RB on the frequency or space axis. A projected channel vector update process updates a projected channel vector of an unselected user by GS orthogonalization. An orthogonal coefficient computation process computes an orthogonal coefficient. A corrected SINR computation process computes a corrected SINR. A next MIMO layer priority computation process computes priorities of unselected users for a corresponding RB in the next multiple MIMO layer. The priorities of the unselected users are used in the next user scheduling processing.

Scheduling method for multi-user mimo

A radio communication system for quickly selecting an optimum transmission mode in accordance with the quality and situation of a propagation path is provided. The system comprises first and second radio communication apparatuses capable of radio-communicating with each other. The first radio communication apparatus comprises a propagation path environment estimator for outputting the estimation result as propagation path environment information, a propagation path quality estimator for outputting the estimation result as propagation path quality, and a transmitter for transmitting both the informations to the second radio communication apparatus. The second radio communication apparatus comprises a transmission mode selector for selecting one of the transmission modes used for communicating with the first radio communication.

Radio communication system and transmission mode selecting method

In a MIMO receiving apparatus, the signals of single carriers transmitted from a plurality of transmission antennas are received by a plurality of reception antennas ( 1 - 1 through 1 -N) and then separated according to frequency ranges. In this MIMO receiving apparatus, interference replicas of the antennas are eliminated from the received signals (by subtractor 54 ) before equalizing the two-dimensional frequency ranges, and non-distortion signal replicas are added (by a demodulating part 55 ) to the signals from which the interference replicas of the antennas have been eliminated after equalizing the two-dimensional frequency ranges.

Mimo receiving apparatus and receiving method

A multi-user receiving apparatus is provided for achieving a reduction in the amount of processing for single-carrier FDMA signals and an improvement in reception characteristics A DFT unit converts single-carrier FDMA received signals of all users to signals in a frequency domain commonly A demapping unit selects part of sub-carriers for each user from sub-carriers supplied from the DFT unit A reception filter separates a user signal and suppresses noise A demodulator demodulates the user signal, and detects a timing thereof

Multi-user receiving apparatus converting SC-FDMA received signals of all users to signals in a frequency domain commonly

A multibeam transmitting/receiving apparatus is provided that is capable of increasing the accuracy of a direction in which a transmission beam is to be transmitted, with a simple arrangement. Signal power measuring units ( 8 - 1 through 8 -L) of signal processing means ( 40 - 1 through 40 -L) measure reception signal power levels averaged over a given time, using outputs from reception beam formers ( 5 - 1 through 5 -L), and indicate the measured reception signal power levels to transmission antenna weight generator ( 30 ). Transmission antenna weight generator ( 30 ) generates transmission antenna weights, which has been weighted by a reception signal level, from a transmission antenna weight corresponding to reception signal power level P 1 and a beam number B 1 of a finger having a maximum reception signal power level, and a transmission antenna weight corresponding to reception signal power level P 2 and a beam number B 2 of a finger having the same path timing as the finger having the maximum reception signal power level. The generated transmission antenna weights are used in transmission beam former ( 16 ).

Masayuki Kimata

Papers

Scheduling method for multi-user mimo

Radio communication system and transmission mode selecting method

Mimo receiving apparatus and receiving method

Multi-user receiving apparatus converting SC-FDMA received signals of all users to signals in a frequency domain commonly

Multi-beam transmitting/receiving apparatus and transmitting/receiving method