Panasonic Corporation

Matsushita Electric Industrial Co., Ltd.

Panasonic Intellectual Property Management Co., Ltd.

Kazuhiro Ando

Yoshio Urabe

Shinichiro Ohmi

Hiroshi Hayashino

Hiroyuki Imai

Hiroshi Takahashi

Masataka Irie

Hironori Nakae

Yasuo Harada

Chalermphol Apichaichalermwongse

Kenji Miyanaga

Toshiaki Ohnishi

Takayuki Suematsu

Shinichiro Omi

Tsutomu Mukai

Naoto Oka

Takenori Sakamoto

Pek Yew Tan

Yosuke Ukita

Shuya Hosokawa

Naotake Yamamoto

Kunihiko Sakaibara

Wei Lih Lim

Kazuhiro Ohta

Apichaichalermwongse Chalermphol

A radio communication method includes the steps of: storing a beam having a good characteristic and a beam having a bad characteristic on the basis of a result of beamforming setting; reserving a calibration period; changing a beam to the beam having the bad characteristic in the reserved calibration period; performing calibration in the reserved calibration period; and changing the beam having the bad characteristic to the beam having the good characteristic after the reserved calibration period has elapsed.

Radio communication method and radio communication apparatus

In a signal detection apparatus, power detection sectiondetects power of an inputted received signal, and upon detection of power exceeding a power detection threshold, outputs a trigger to storage section. Storage sectionstores a first received signal upon reception of the trigger and outputs the stored first received signal to multiplierand newly stores a second received signal upon receipt of the next trigger. Multipliermultiplies the second received signal by the first received signal, integratorintegrates the multiplication result from multiplierduring a predetermined duration to obtain a correlation value of the second and first received signals, and absolute value calculation sectioncalculates an absolute value of the correlation value from integrator. Determination sectiondetermines the presence/absence of a detection-target signal based on the absolute value of the correlation value from absolute value calculation section

Signal detector device and signal detection method

A master device transmits a beacon signal including information related to a proximity wireless communication area in a predetermined cycle by using a transmission power which allows the beacon signal to reach beyond the proximity wireless communication area. When a slave device receives the beacon signal from the master device, the slave device estimates a distance to the master device in accordance with the information of the beacon signal. When a wireless communication terminal is located within the proximity wireless communication area, the slave device is connected to the master device by using a proximity wireless communication.

Wireless communication terminal, wireless communication device, and wireless communication method

The communication terminal includes a receiving unit and a transmission unit, which serve as a communication unit for signal exchange; and a beacon processing unit as a first detection unit that detects, for each channel, the number of the other communication terminals performing wireless communication by receiving a terminal number notification signal from a control device. Additionally, a data processing unit is provided as a second detection unit that counts, for each channel, the number of the other communication terminals found by receiving acknowledgement signals transmitted from the other communication terminals; and a channel control unit selects a frequency channel having a least difference between the number detected by the beacon processing unit and the number counted by the data processing unit, and causes the receiving unit and the transmission unit to perform the signal exchange via the selected frequency channel.

Communication terminal, control device, communication method, control method, program, and integrated circuit

In this signal detection device (), a delaying unit () delays a first distributed signal or a second distributed signal distributed from a received signal for a period of time of Tto form a first multiplication signal, and delays the one for a period of time of T(T&#x3e;T) to form a second multiplication signal. An integrator () calculates a first correlation value by integrating the result of multiplying the first distributed signal and the first multiplication signal. An integrator () calculates a second correlation value by integrating the result of multiplying the second distributed signal and the second multiplication signal. An evaluation unit () evaluates whether the signal to be detected, which is a periodic signal with a period of Tor a periodic signal with a period of T, exists or not, on the basis of the first correlation value and the second correlation value.

Signal detection device and signal detection method

When communicating with a second wireless station, a first wireless station judges, based on link-related information received from the second wireless station and link-related information extracted from a signal transmitted by a fourth wireless station, whether a transmission link from the third wireless station to the fourth wireless station and a transmission link from the first wireless station to the second wireless station can be concurrently established without interference with each other. If judging affirmatively, the first wireless station transmits a signal to the second wireless station in synchronization with a signal transmitted by the third wireless station to the fourth wireless station.

Wireless communication apparatus and wireless communication method

Provided is a communication method for improving the communication quality of multicast transmission. A grouping table storage section stores a grouping table in which Ack return order positions indicating priority orders of the reception terminals which each return an Ack, and addresses of the reception terminals are set. An Ack return order position notification frame creation section notifies each reception terminal of a corresponding Ack return order position based on the grouping table. An Ack return permission information determination section refers to the grouping table, determines the number of reception terminal that are to be permitted to return an Ack, and creates Ack return permission information in which information about the reception terminals that are to be permitted to return an Ack is set, based on the determined number of reception terminals. A multicast creation section creates a multicast containing the Ack return permission information and transmission data.

Communication method

A communication device according to the present invention includes: a receiving unit which receives a block transmitted by a communication device; a photocurrent measuring unit which measures a reception quality of the received block; a PHY rate determining unit which determines, based on the reception quality, a PHY rate that is used by the communication device for transmitting a next block; a block size control unit which determines, based on the measured reception quality, a block size; and a transmission unit which transmits feedback information including the determined PHY rate and the determined block size to the communication device, and the block size control unit determines the block size to be a value smaller than a maximum value of a block size that can be transmitted by the communication device, when a value indicating the reception quality of the block is within a predetermined range including a PHY rate threshold.

Communication device and communication method

The present invention aims to provide a transmission device that, in a communication system using multilevel modulation with 2^n levels (n being an integer greater than or equal to two), limits the run length to a predetermined value or less and guarantees DC balance. The transmission device, which transmits data to which 2^n amplitude modulation has been applied, separates data for transmission into n data sequences; encodes one of the n data sequences to guarantee run length, thereby generating a converted data sequence; generates an intermediate data sequence by either inverting or not inverting a specific data sequence so that, based on candidate data, the next output voltage guarantees DC balance; and applies 2^n amplitude modulation to n-bit symbols each of which has a bit in the intermediate data sequence as a most significant bit and bits in the remaining data sequences, excluding the specific data sequence, as subsequent bits.

Transmission device

A spreading code generating apparatus carries out M-sequence multiplication and zero value addition of generated orthogonal codes to obtain channel identification codes, and then carries out inverse Fourier transform of the channel identification codes to generate spreading codes and inverse spreading codes. A transmitting apparatus and a receiving apparatus store the spreading codes and the inverse spreading codes generated by the spreading code generating apparatus, respectively, and use a single code respectively selected from the stored codes to carry out spread spectrum communication.

System and method for spread spectrum communication

A reception stationcompares its BSSID with BSSID included in a signal that has arrived thereat. As BSSIDs included in signals transmitted by interfering stationsandboth match BSSID of the reception station, the reception stationidentifies each of the interfering stationsandas a non-suppression target transmission source. As neither of BSSIDs included in signals transmitted by interfering stationsandmatches BSSID of the reception station, the reception stationidentifies each of the interfering stationsandas a suppression target transmission source. The reception stationuses characteristic amounts of signals that are associated with the interfering stations (i.e., suppression target transmission sources)andand that have been measured in the past as characteristic amounts of interfering signals that are used to suppress the interfering signals from a received signal.

Interference suppression method and interference suppression device

In a receiver, a channel estimation unit estimates channel characteristics of each channel, and a weight generation unit generates a weight matrix used in equalization processing by an equalizer in accordance with the estimated values of channel characteristics for each channel as estimated by the channel estimation unit. Furthermore, a likelihood calculation unit calculates a likelihood indicating a degree of certainty for each transmission stream using the weight matrix generated by the weight generation unit, and an adaptive control unit determines a transmission rate appropriate for transmission of a signal from a transmitter to the receiver in accordance with the likelihood of each transmission stream calculated by the likelihood calculation unit, notifying the transmitter of the determined transmission rate.

Reception device, transmission device, and adaptive transmission rate control method

When communicating with a second wireless station, a first wireless station judges, based on link-related information received form the second wireless station and link-related information extracted from a signal transmitted by a fourth wireless station, whether a transmission link from the third wireless station to the fourth wireless station and a transmission link from the first wireless station to the second wireless station can be concurrently established without interference with each other. If judging affirmatively, the first wireless station transmits a signal to the second wireless station in synchronization with a signal transmitted by the third wireless station to the fourth wireless station. Preferably, when the first wireless station having a concurrent transmission control function communicates with the second wireless station having a interference reduction function, the first wireless station controls the interference reduction function of the second wireless station based on the link-related information received from the second wireless station and interference information, such that the transmission link from the third wireless station to the fourth wireless station and the transmission link from the first wireless station to the second wireless station can be established at the same time without interference with each other. If judging that the concurrent transmission is available, the first wireless station transmits a signal to the second wireless station according to a timing that overlaps transmission of a signal from the third wireless station to the fourth wireless station.

A wireless communications system in which real-time data and burst data can be mixedly transmitted, and a transmission band can be dynamically assigned according to a state of data transmission. A master station has a scheduler for determining a transmission band assignment including information about the transmission timing of the data, a transmission amount, and a state that is allowed to access. The scheduler regularly carries out scheduling and optimizes the transmission band to be assigned dynamically according to the communication type of the data and a state of data transmission. The master station gives a transmission band assignment which is determined by the scheduler to each slave station. A transmitting station executes data transmission (access) to a receiving station based on the given transmission band assignment. The receiving station gives information about a state of data receiving to the master station, where the scheduler reflects this on scheduling.

Wireless communications system with dynamic transmission band assignment

The presented invention provides methods and apparatus to generate a efficient medium dedication schedule which give wireless medium the ability to serve real-time and non real-time application concurrently and still be able to maintain the QoS as requested by real-time application. Furthermore, it also presents methods for implementing buffer in an efficient matter in order to complement the advantage introduced by burst transmission and burst acknowledgement.

Growing community of inventors

Kanagawa, Japan

Kazuhiro Ando