Showing papers by "Tetsu Tanaka published in 2005"

Radio relay system, radio relay apparatus, and radio relay method

Abstract: A radio relay system is disclosed that is capable of preventing communication degradation in a case where radio signals are relayed using the same frequency band in a mobile communication environment. The radio relay system includes a first radio station, a second radio station, and a radio relay apparatus for relaying a radio signal that is exchanged between the first radio station and the second radio station. The radio relay apparatus includes a phase correction determining unit that determines a phase correction amount of the relayed signal based on channel information pertaining to channels established between the first radio station, the second radio station, and the radio relay apparatus, and a phase correction unit that corrects the relayed signal based on the phase correction amount determined by the phase correction determining unit.

A study of highly scalable DG-FinDRAM

Abstract: This letter reports the scalability of a capacitor-less 1T-DRAM, and proposes a new concept about extending the use of 1T-DRAM to gate lengths of less than 50 nm. Superior characteristics such as long retention time and large sense margin even for gate lengths around 50 nm can be obtained with a double-gate fully depleted FinFET DRAM. Considering capacity, speed, power, and structural complexity of embedded memory, the capacitor-less 1T-DRAM has the possibility of playing the leading role among other memories.

Wireless relay system, wireless relay apparatus, and wireless relay method

Abstract: A wireless relay system for relaying a radio signal transmitted from a first wireless station to a second wireless station via a wireless relay apparatus is disclosed. The wireless relay system includes a relay control part for receiving transmission symbols transmitted from the first wireless station and refraining from relaying a portion of the symbols, a pilot signal transmission part for transmitting a pilot signal that is inserted into a section of the portion of the transmission symbols, a coupling loop interference wave estimation part for receiving the pilot signal and estimating a coupling loop interference wave based on the pilot signal, and a coupling loop interference wave cancellation part for subtracting the estimated coupling loop interference wave from a reception signal.

Repeating station, a communication apparatus, and a directivity control method

Abstract: A repeating station, a communication apparatus, and an antenna directivity control method are disclosed. The repeating station includes a first antenna group including at least one antenna element, a second antenna group that is different from the first antenna group, the second antenna group including two or more antenna elements adjusted so that radiation in the direction of the first antenna group is reduced, wherein the second antenna group is adjusted such that radiated power in the direction of the first antenna group is reduced.

45-nm node CMOS integration with a novel STI structure and full-NCS/Cu interlayers for low-operation-power (lop) applications

Abstract: We describe the integration of a 45-nm node CMOS for low operation power (LOP) application The SD extension profile along with a strain channel and a thin-gate-SiON were optimized to keep high drive current at the 45-nm node A novel STI structure was developed to reduce the SRAM cell size Nano-clustering silica (NCS) without a middle-etch stopper (MES) was also developed to decrease the wire capacitance As a result, we achieved an excellent LOP device operation with conventional processing, and we produced a 50% smaller SRAM cell-size as compared to the 65-nm node

Storage element matrix, method for manufacturing such storage element matrix and semiconductor storage device using such storage element matrix

Abstract: [PROBLEMS] To provide a storage element matrix wherein 1T-DRAM storage elements which have high density but do not cause multiselection are laid, a method for manufacturing such storage element matrix, and a semiconductor circuit device using such storage element matrix. [MEANS FOR SOLVING PROBLEMS] The storage element matrix is provided with an isolated semiconductor region on an insulating supporting substrate; the storage element formed in the semiconductor region; and an insulating region for insulating the storage element. The storage element is provided with a source region; a drain region; a front plane gate region arranged on a side plane of the semiconductor region through a gate insulating film so as to separate the source region from the drain region; and a rear plane gate region arranged on a side plane facing the side plane of the semiconductor region through a gate insulating film so as to separate the source region from the drain region. The storage element shares the rear plane gate region with a storage element adjacent in a row direction.

Radio transmission system,radio relay system and communication device

Abstract: A communication apparatus in a radio transmission system in which plural first communication apparatuses sends the same transmission signals and a second communication apparatus receives the transmission signals is disclosed. The communication apparatus functions as one of the plural first communication apparatuses, and the communication apparatus includes: a detection part for detecting a start or a stop of data transmission performed by a first communication apparatus that is different from the communication apparatus; and a guard interval length control part for controlling a guard interval length on the basis of a detection result of the detection part.

A communication apparatus for a repeating station

Abstract: A communication apparatus characterized by: a received signal property calculating unit for calculating a property of a received signal; and a determining unit for determining whether to start or stop transmission of a transmitting signal from a repeating station based on the property of the received signal.