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Frequency domain communication channel prediction arithmetic

A technology of frequency domain channel and prediction method, applied in multi-frequency code systems, baseband system components and other directions, can solve the problems of large computing load, increased complexity, and heavy computing load.

Inactive Publication Date: 2007-02-28
PANASONIC CORP +1
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AI Technical Summary

Problems solved by technology

However, especially in broadband wireless communication systems, it is difficult to determine a sufficient number of effective paths
If the number of paths is too large, the computational complexity will increase. Conversely, if the number of paths is too small, the prediction performance accuracy cannot be guaranteed.
[0009] (2) Vulnerable to deep fading
[0011] (3) Heavy computing load
[0021] However, how to reduce the calculation load without reducing the prediction accuracy is also the most important issue in frequency domain channel prediction
In the conventional frequency domain channel prediction, since the filter coefficients are calculated by MMSE for each subcarrier, it is considered that the calculation load is extremely large in a broadband wireless communication system with a large number of subcarriers

Method used

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Embodiment Construction

[0035] Next, an embodiment of the present invention will be described with reference to the drawings.

[0036] FIG. 1 is a diagram showing a system model of a frequency domain channel prediction method according to an embodiment of the present invention. In Fig. 1, an OFDM system with K subcarriers is considered. The modulated transmitted symbols S(n, k) k∈{0, 1, . . . , K-1} are output to an inverse fast Fourier transform (IFFT) module. Here n represents the serial number of the OFDM symbol, and k represents the serial number of the subcarrier. The output series of the IFFT module can be expressed as s(n, m), m ∈ {0, 1, ..., K-1}. After adding a cyclic prefix to the obtained symbols, the received signal r(n, m) is expressed by the following formula (1).

[0037] r ( n , m ) = Σ l = 0 L ...

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Abstract

The sub carrier wave selector (107) selects m sub carrier waves from n sub carrier waves of signal. The filter factor calculator (108) calculates the filter factor used to forecast the signal channel via the signals of m sub carrier waves; the filter factor average part (301) averages said m filter factors; and the signal channel forecast part (109) uses average filter factor to forecast the future signal channel frequency response of all sub carrier waves.

Description

technical field [0001] The invention relates to a frequency domain channel prediction method and a wireless communication device suitable for an OFDM-based broadband wireless communication system. Background technique [0002] In an OFDM wireless communication system, a signal before Fast Fourier Transform (FFT) processing is defined as a time-domain signal, and a signal after FFT processing is defined as a frequency-domain signal. In the OFDM system, according to the characteristics of the processed signal, it can be divided into time domain and frequency domain signals. [0003] Similarly, channel prediction can also be performed in the time domain and frequency domain. Time-domain channel prediction is based on each channel path independently. [0004] When the change speed of the channel is low and the number of paths of the channel is small, the calculation amount of the time-domain channel prediction is relatively low, so it can be used as an engineering application ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/02H04L27/26
Inventor 星野正幸曹卫锋王文博刘元安
Owner PANASONIC CORP
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