Estimating system and estimating method of Doppler frequency
A Doppler frequency and frequency technology, applied in transmission systems, radio transmission systems, baseband system components, etc., can solve the problems of large Fourier transform resolution requirements, increase system cost, affect system performance, etc., to save system Costs and the effect of reducing the amount of data
Inactive Publication Date: 2012-10-10
MEDIATEK INC
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[0005] Although the above technology can directly estimate an estimated Doppler frequency, yet, due to the limitation of the speed of the receiving end, the general Doppler frequency is about tens of Hertz to 1.5K Hertz (Hz), in order to accurately estimate the Doppler frequency Puler frequency, when the second processing module 30 executes the fast Fourier transform, the resolution requirement of the Fourier transform is relatively large, that is, the amount of data to be processed in the frequency domain becomes large, thereby increasing the cost of the entire system
However, if the resolution of the Fourier transform of the second processing module 30 is reduced, although the amount of data can be reduced, it is impossible to accurately estimate the Doppler frequency of the receiving end, thereby affecting the performance of the system
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[0030] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.
[0031] See figure 2 , figure 2 It is a schematic structural diagram of the Doppler frequency estimation system of the present invention, which is applied to the receiving end of a wireless transmission system. The estimation system 200 includes a base projection device 210 , a polynomial generation device 220 and an extremum determination device 230 .
[0032] The basic substrate projection device 210 is used to receive N channel sampling signals h=[h 1 , h 2 ,...,h N ,] T , and the N channel sampling signals h=[h 1 , h 2 ,...,h N ,] T Projecting onto a set of orthonormal bases V K , and then generate multiple channel correlation vectors υ, that is υ = V K T ...
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The invention discloses an estimating system and an estimating method of Doppler frequency. The estimating system comprises a foundation basement projector device, the foundation basement projector device is used for receiving a plurality of channel sampling signals, and projecting the channel sampling signals to a group of orthogonal basement so as to generate a plurality of channel relevant vectors, a multinomial generator device is connected to the foundation basement projector device, according to the plural channel relevant vectors an estimating frequency is enveloped to noise interference power ratio and a channel envelopment power so as to generate a target multinomial, an extreme value decision device is connected to the multinomial generator device and is used for deciding the extreme value of the target multinomial and outputting a frequency corresponding to the extreme value as an estimating Doppler frequency. With the invention applied, the Doppler frequency of a mobile device can be estimated without requiring massive calculation.
Description
technical field [0001] The invention relates to the technical field of wireless transmission, in particular to a Doppler frequency estimation system and method. Background technique [0002] Due to the relative movement between the transmitting end and the receiving end, the wireless transmission channel will change dynamically, and the statistics of the time-varying characteristics of the wireless transmission channel have a close relationship with the Doppler spectrum. The Doppler spectrum is generated by Fourier transforming the autocorrelation function of a channel pulse response, also known as Doppler spread, where the Doppler spread is related to the relative Proportional to the speed of movement. [0003] Due to the Doppler effect, the characteristics of the channel will change with time, thereby increasing the uncertainty of the signal quality. At the same time, the Doppler extension will produce a frequency offset effect at the receiving end, increasing the bit er...
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IPC IPC(8): H04L25/02H04B7/01
Inventor 杨凯杰王信渊郭维礼
Owner MEDIATEK INC