Nec Corporation

Osami Nishimura

Motoya Iwasaki

Yukio Haseba

Hisashi Kawabata

Emiko Sakuma

Daisuke Kondo

Sei Hirade

Daisuke Kondou

A wireless communication apparatus with a plurality of antennas which receive a wireless reception signal from a secondary communication apparatus, and a combiner which combines signals from the plurality of antennas to form a combined signal or selects one of the signals from the plurality of antennas. A wireless communication apparatus with a plurality of antennas which transmits a wireless transmission signal to a secondary communication apparatus and a divider which divides a transmission signal into plurality of transmission signals to be transmitted by the plurality antennas or selects one of the plurality of antennas to transmit the transmission signal.

Wireless diversity receiver using a combiner with control weights that are based on reported transmission power

A radio base station which receives a first and a second communication channel from a radio communications device comprises a control circuit for detecting the reception quality of the first communication channel, conducting an inner-loop power control for controlling transmission power of the first communication channel from the radio communications device based on the reception quality and an inner-loop power control target value, and adding a power control offset to the inner-loop power control target value before starting a communication through the second communication channel.

Radio communications system and control method therefor

An active set control method for handover operation in a CDMA communications system in which propagation conditions of an uplink channel and a downlink channel for an access link of cell are different, provides that when a cell is deleted from the active set based on a request of a base station which has detected a degraded signal of the uplink channel, a predetermined period of time is to be counted for inhibiting addition of the same cell in the active set based on a request of a mobile terminal which has detected a satisfied signal of the downlink channel, thereby preventing the deletion and addition of the cell in the active set from successive operations in a short time.

Mobile communications system, radio network controller, and active set control method

A synchronization method for received sign and its apparatus capable of increasing accuracy of detection of a receiving signal, of estimating a frequency and of improving reliability in the synchronization of received signal are provided. A signal intensity detecting section is used to detect some peak values and timing values of signals obtained in a first frame and to store them into a memory. A signal extracting section is used to estimate timing, in a second frame, by obtaining a largest synthesized peak value in both frames from the peak value and timing value supplied by a timing estimating section. In a frame following the second frame, frequency data estimated based on a frequency estimating signal with an estimated timing and frequency data estimated based on a frequency estimating signal corresponding to the estimated timing in the frame following the second frame are synthesized and an estimated frequency error is obtained from the synthesized frequency data. The correlation between a synchronization word with its frequency corrected based on an estimated frequency error by a signal extracting and frequency correcting section and a known synchronization word is examined by a synchronization word correlating section and synchronization of a receiving signal is established by a timing estimating section.

Method and apparatus for signal receiving synchronization

A reception synchronization circuit for receiving a unique word transmitted in a predetermined digital pattern. A detection circuit detects the reception electric field intensity as received power. A UW correlation judgment circuit detects the unique word (hereinafter referred to as &ldquo;UW&rdquo;) and takes a correlation between the unique word thus detected and a predetermined digital pattern. A memory stores two or more threshold values for the movement average. After the two or more threshold values and the movement average are compared with each other, the correlation is taken by the UW correlation judgment circuit when the movement average is larger than the minimum values of the two or more threshold values.

Reception synchronization circuit, receiver using the same, and digital communication system

A demodulation circuit including error correction based on convolution coding and Viterbi decoding by which the characteristic of error correction is further improved. The demodulation circuit including error correction demodulates a burst data signal received in a satellite communication channel having a low carrier power to noise power ratio using reference bits, the reference bits are removed from the demodulated burst data, the burst data are deinterleaved, from which the reference bits have been removed, in accordance with specifications, and Viterbi decoding decodes convolutionally coded burst data, and weighting includes each value of the demodulated burst data in accordance with the distance from the reference bits of the burst data.

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Tokyo, Japan

Osami Nishimura