System and method for LET/LETE-A downlink time-frequency transformation
An LTE-A, time-frequency conversion technology, applied in the field of communication, can solve the problems of occupying chip area and low utilization rate of hardware resources, and achieve the effect of increasing utilization rate, reducing waiting time, and reducing chip area.
Active Publication Date: 2014-07-02
LEADCORE TECH
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[0007] The purpose of the present invention is to provide a system and method for LTE / LTE-A downlink time-frequency conversion to solve the problem that in the prior art, the two symbols of the dual antenna adopt the non-pipelined Cooley Tukey structure FFT to occupy a large amount of chip area and hardware. The problem of low resource utilization
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[0032] The LTE / LTE-A downlink time-frequency conversion system and method proposed by the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. Advantages and features of the present invention will be apparent from the following description and claims. It should be noted that all the drawings are in a very simplified form and use imprecise scales, and are only used to facilitate and clearly assist the purpose of illustrating the embodiments of the present invention.
[0033] In the present invention, the fast Fourier transform in the time-frequency conversion uses a streamlined fast Fourier transform structure. The feature of the streamlined fast Fourier transform is that the data of the next step can be input while calculating the current step. This structure is beneficial to many Group FFT calculations are particularly efficient, saving input data time for all steps except the first one. According...
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The invention provides a system and method for LET / LETE-A downlink time-frequency transformation. The method comprises the steps of measuring the direct current component in a first antenna, the direct current component in a second antenna and a time-domain received signal strength indicator (RSSI); eliminating the direct current component in the first antenna and the direct current component in the second antenna, and then conducting fast Fourier transformation on data in the first antenna and data in the second antenna; conducting frequency-domain received signal strength display measurement on the data obtained after the fast Fourier transformation; outputting the value obtained from the measurement and storing the value in a symbol storer. According to the system and method, by inputting the data in the first antenna and the data in the second antenna continuously into a fast Fourier transformation module without the need of waiting for the completion of all computations of the first antenna, the waiting time before computation of the second antenna is shortened greatly, double-antenna pipelining serial computation can be achieved by means of only one set of fast Fourier transformation module within one conforming period, the utilization rate of hardware resources is increased, and the area of a chip is reduced.
Description
technical field [0001] The present invention relates to the field of communication technology, in particular to a system and method for LTE / LTE-A downlink time-frequency conversion. Background technique [0002] The discrete Fourier transform (DFT) is a form of continuous Fourier transform that is discrete in both the time domain and the frequency domain, and transforms the sampling of time domain signals into sampling in the discrete time Fourier transform frequency domain. Formally, the sequences at both ends of the transformation (in the time domain and frequency domain) are of finite length, but in fact these two sets of sequences should be considered as the principal value sequences of discrete periodic signals, even for finite-length discrete signals DFT should also be regarded as a periodic signal after period extension and then transformed. In practical applications, fast Fourier transform is usually used to efficiently calculate DFT. [0003] Fast Fourier transfor...
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IPC IPC(8): H04L27/26H04L1/06
Inventor 潘磊
Owner LEADCORE TECH