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Radio equipment and doppler frequency estimating circuit used for the radio equipment

A Doppler frequency, wireless device technology, applied in radio transmission systems, antennas, electrical components, etc., can solve the problems of not developing the transmission path Doppler frequency, inability to calculate correlation values, and multiple interference components.

Inactive Publication Date: 2010-02-24
KYOCERA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this existing method, because the reference signal contained in the received signal itself is used to calculate the correlation value, it will contain more interference components, and it is difficult to perform correct estimation
[0068] In addition, since the timing of the reference signal is fixed, the correlation value cannot be calculated at any timing, which lacks the adaptability of calculation processing
[0069] On the other hand, no method has been developed to estimate the transmit path Doppler frequency of each separated user terminal by adaptive array processing

Method used

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  • Radio equipment and doppler frequency estimating circuit used for the radio equipment
  • Radio equipment and doppler frequency estimating circuit used for the radio equipment
  • Radio equipment and doppler frequency estimating circuit used for the radio equipment

Examples

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Embodiment Construction

[0138] figure 1 Shown is a block diagram of the configuration of a PDMA base station wireless device (wireless base station) 1000 according to the embodiment of the present invention.

[0139] Such as figure 1 As shown, in order to identify users PS1 and PS2, four antennas #1 to #4 are set up. The number of these antennas can generally be N (N: natural number).

[0140] figure 1 The shown transceiver system 1000 has a receiving part SR1, which is used to receive signals from antennas #1~#4, and separates signals from corresponding users, such as user PS1, and a sending part ST1, which uses to send a signal to user PS1. Connections between antennas #1 to #4, and reception unit SR1 and transmission unit ST1 are selectively switched by switches 10-1 to 10-4.

[0141] That is, the receiving signals RX1(t), RX2(t), RX3(t), and RX4(t) received at each antenna enter through corresponding converters 10-1, 10-2, 10-3, and 10-4 The reception unit SR1 is input to the reception w...

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Abstract

A radio equipment (1000) separates a signal from a specific terminal among signals from adaptive array antennas (#1 to #4), based on a reception weight vector calculated by a reception weight vector calculator (20). A reception response vector calculator (22) draws out a reception response vector of a propagation path of the signal from the specific terminal. A correlation operation and Doppler frequency estimating circuit (103) calculates a correlation value between reception response vectors of corresponding slots of continuous frames, and estimates a corresponding Doppler frequency based ona correspondence found in advance. A transmission response vector estimator (32) predicts a transmission response vector, by performing an extrapolation process in accordance with the estimated Doppler frequency.

Description

[0001] This application is a divisional application of the original application with the application number 01132898.3 and the filing date of July 27, 2001. The earliest priority date of the original application is July 27, 2000. Technical field: [0002] The invention relates to a wireless device capable of changing antenna directivity in real time and a Doppler frequency estimation circuit for the wireless device, in particular to a wireless device used in an adaptive array wireless base station and a Doppler frequency estimation circuit for the wireless device. Le frequency estimation circuit. Background technique [0003] In recent years, in mobile communication systems, various methods for allocating transmission channels for the purpose of efficient use of frequencies have been proposed, and some of them have been put into practical use. [0004] Figure 15 Shown are channel configuration diagrams of various communication systems such as Frequency Division Multiple Acc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/01H04B7/06H04B7/08H04B7/10H01Q3/26H04B7/26
Inventor 北门顺土居义晴
Owner KYOCERA CORP