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Base station device
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A base station and frequency conversion technology, applied in the direction of synchronization devices, electrical components, connection management, etc., can solve the problem of not considering multiple channel search processing, etc., and achieve the effect of widening the dynamic range
Inactive Publication Date: 2012-04-25
KOKUSA ELECTRIC CO LTD
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[0003] However, in the method disclosed in Patent Document 1, the search process for multiple channels is not considered
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no. 1 Embodiment approach
[0047] Hereinafter, the first base station 2 according to the first embodiment of the present invention will be described.
[0048] figure 2 It is a block diagram showing the configuration of the first base station 2 .
[0049] Such as figure 2 As shown, the first base station 2 has: a first baseband unit 20, a D / A converter 264, a wireless modem unit 266, and an A / D converter 268, and the baseband unit 20 has: a modulation unit 260, a spectrum spreading unit 262, The first delay profile detection unit 22 , the first path search unit 270 , the despreading unit 272 , and the demodulation unit 274 .
[0050] The base station 2 transmits data acquired via the network 10 to the mobile station 12 through these components, receives a signal from the mobile station 12 , detects received data from the received signal, and outputs it to the network 10 .
[0051] The modulation unit 260 modulates the transmission data acquired from the network 10 and outputs it to the spreading uni...
no. 2 Embodiment approach
[0226] Next, the second base station 4 according to the second embodiment of the present invention will be described.
[0227] In a receiving unit of a wireless base station apparatus employing the W-CDMA system, a DSP (Digital Signal Processor) or the like is used to perform despreading processing (correlation detection processing) in software, for example, the following method is proposed: FFT) and Inverse Fast Fourier Transform (IFFT), despread in software.
[0228] The synchronization detection process of the spreading code in the radio base station apparatus employing such a method is performed, for example, as follows.
[0229] First, the radio base station apparatus performs FFT processing on reception data (preamble) transmitted from a mobile terminal (mobile station). In addition, FFT processing is also performed on a scrambling code (scrambling code) prepared on the side of the radio base station apparatus.
[0230] Next, the product of the result of transforming t...
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Abstract
A base station device capable of easily conducting large-scale searches for a number of channels by execution of software is provided. A first filtering section filters reception data to which FFT has been applied by multiplying the reception data by rectangular wave window. A second FFT section applies FFT to respective codes stored in a code storage section. A multiplication section calculates correlation values by multiplying the reception data after FFT by the codes after FFT. A second filtering section filters the calculated correlation values by multiplying the correlation values by Hamming window. An averaging section averages the filtered data. An IFFT section applies IFFT to the averaged data to produce a delay profile. A path search section searches respective paths of the channels based on delay profiles produced for each of the different channels.
Description
technical field [0001] The present invention relates to a base station device of a CDMA mobile communication system, and more particularly to a base station device which performs search processing in a softwaresystem. Background technique [0002] For example, Patent Document 1 discloses a method of performing search processing at high speed by software using FFT (Fast Fourier Transform) / IFFT (Inverse Fast Fourier Transform) using a DSP (Digital Signal Processor). [0003] However, in the method disclosed in Patent Document 1, no consideration is given to performing search processing on a plurality of channels. [0004] In addition, in a radio base station apparatus employing such a method, it is necessary to perform synchronization detection processing of a spreading code with a wide dynamic range. [0005] [Patent Document 1] (Japanese) Unexamined Patent Application No. 2004-32568 Contents of the invention [0006] The present invention has been made in view of the ab...
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