Ntt Mobile Communications Network, Inc.

Seizou Onoe

Shinji Uebayashi

Akihiro Higashi

Etsuhiro Nakano

Koji Ohno

A method of frequency utilization in mobile communication which is capable of realizing efficient frequency utilization in the case where widths of the uplink communication frequency bandwidth and the downlink communication frequency bandwidth are different in mobile communication is disclosed. Two pieces of carriers U and U among the uplink carriers U to U are selected as selected carriers, carriers U to U of the uplink bandwidth Wu and carriers D to D of the first downlink bandwidth Wd are set in one-to-one correspondence, the selected carriers U and U and carriers D and D of the second downlink bandwidth Wd are set in one-to-one correspondence, the communications are carried out by using D and D as downlink carriers in the case of using the selected carrier U as an uplink carrier, and the communication are carried out by using only a corresponding carrier in the first downlink bandwidth Wd as a downlink carrier in the case of using a carrier other than the selected carrier as an uplink carrier.

Frequency utilization method in mobile communication

A RAKE receiver which is employed in a direct sequence spread spectrum communication system, and which can effectively receive multipath signals. A path searcher measures the amplitude of each path, selects N paths with larger amplitudes in descending order of magnitude, where N is the number of despreaders, and assigns the despreaders to the selected paths to despread the signals of the paths. This assignment of the despreaders to the paths is carried out such that a path with a large amplitude and a path with a small amplitude are assigned to adjacent despreaders and are input to the same pre-detection combiner. The outputs of the despreaders are combined by the pre-detection combiners, and detected by detectors whose outputs are RAKE combined by a post-detection combiner.

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Kanagawa-ken, Japan

Seizou Onoe