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Path search method and path search device, and mobile terminal

A path search, multi-path technology, applied in radio/induction link selection arrangement, space transmit diversity, communication between multiple stations, etc., can solve problems such as not raised

Inactive Publication Date: 2003-12-24
YOZAN INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the method of transmit diversity is adopted in the base station, there is actually no proposed technique for performing path search without using a complicated circuit structure.

Method used

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  • Path search method and path search device, and mobile terminal
  • Path search method and path search device, and mobile terminal
  • Path search method and path search device, and mobile terminal

Examples

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Comparison scheme
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no. 1 example

[0043] A first embodiment of the present invention will be described below with reference to the drawings.

[0044] Such as figure 1 As shown in , the DS-CDMA system of the present invention (in which the cellular phone 100 is used as the mobile terminal) employs two transmitting antennas A1 and A2 in the base station BS. In the DS-CDMA system, in transmitting a radio signal from a base station BS to a cellular phone, transmit diversity with two branches is employed. Note that the above-mentioned STTD method is used as the transmit diversity method in the embodiment of the present invention, and the DS-CDMA system employed in the present invention complies with the W-CDMA standard.

[0045] In the DS-CDMA system of this embodiment, predetermined channels including a dedicated physical channel (DPCH) and a common pilot channel (CPICH) are used as transmission channels from the base station BS to the cellular phone 100. Since the dedicated physical channel is a bidirectional c...

no. 2 example

[0117] A second embodiment of the present invention will be described below with reference to the drawings. When comparing the second embodiment with the first embodiment, only the structure of the route search section is different. Thus, the different points will be mainly described below. Note that the same symbols are assigned to the same or equivalent components, and repeated descriptions are omitted in the following description.

[0118] Such as Figure 13 As shown in, similar to the first embodiment, the path search part includes: (a) buffering the input buffer 21 of the received signal RSD (RDI, RDQ) sent from the A / D conversion part 1; The despreading part 22 that the I component received signal RDI sent from the input buffer 21 and the Q component received signal RDQ despread; and (c) the I component despread signal ISI and the Q component despread signal sent from the despreading part 22 The coherent part 23 of the modulation component of the pilot pattern is remo...

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Abstract

By calculating the complex product between each of complex-conjugate patterns for pilot patterns assigned individually to a plurality of transmitting antennas of a base station and a de-spread signal (ISI, ISQ), which has been obtained from a received signal by a de-spreading portion 22, a separating portion 23 separates the pilot block of the de-spread signal, for each of the plurality of transmitting antennas, from the received signal. Subsequently, after a delay-profile for the transmitted signal from each of the plurality of transmitting antennas is created by using the separated signals {(PLI1, PLQ1), (PLI2, PLQ2)}, a delay-profile combining portion 27 combines a delay-profile for multi-path selection, and multi-path selection is performed based on the delay-profile for multi-path selection. Therefore, highly accurate path search is possible in a DS-CDMA system of the transmitter diversity type.

Description

technical field [0001] The present invention relates to a path search method, a path searcher and a mobile terminal, more specifically, to a path search method and a path searcher for performing path search based on received signals emitted from a plurality of antennas in a base station, and a system including the path searcher mobile terminal. Background technique [0002] Recently, a Direct Spread Code Division Multiple Access (DS-CDMA) scheme is used, and a Wideband Code Division Multiple Access (W-CDMA) scheme in which a spread bandwidth is extended to 5 MHz is drawing attention in the field of mobile communication. In DS-CDMA, a signal spread with a spreading code is transmitted from a base station and proceeds from the base station to a mobile station such as a cellular phone under environmental conditions in which there are several propagation paths (called "multipath") . The propagation times differ from each other because the propagation time through the propagati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/707H04B1/7113H04B1/7117H04B7/06H04B7/08H04B7/26H04W16/28H04W88/02
CPCH04B1/7113H04B7/0613H04B2201/70701H04B1/7117H04B7/06H04B1/711
Inventor 铃木邦彦陈小元周长明
Owner YOZAN INC
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