Quick Fourier transforming processer and quadrature carrier frequency division multi-task demodulator

Abstract

Present invention discloses a fast Fourier operative hardware realization method. It contains providing 2 1 point fast fourier transform hard ware having input end and output end, its input end receiving a 2 n + 1 point data, providing 2 n point fast Fourier transform hard ware having input end and output end, providing a selecting device having first input end, second input end and output end, first input end coupling to 2 1 point fast fourier transform hard ware output end, second input end receiving 2 1point data, said selecting device output end coupling to 2 1point fast fourier transform hard ware input end, when input data being 2 n +1 point data, selecting device making first input end coupling to output end of selecting device.

Description

technical field [0001] The invention relates to a fast Fourier transform processor, in particular to a processor capable of processing 2 n+1 with 2 n Point FFT operations switch the FFT processor. Background technique [0002] In the field of wireless communication, in order to increase the sensitivity and accuracy of reception, various modulation and demodulation techniques have been widely discussed and researched, among which the core concept of Orthogonal Frequency Division Multiplexing is one of them. One with the most potential. In OFDM technology, the modulation operation at the transmitting end and the demodulation operation at the receiving end are accomplished by using Inverse Fast Fourier Transform (IFFT) and Fast Fourier Transform (FFT) respectively. The inverse fast Fourier transform and fast Fourier transform are usually implemented in hardware as an inverse fast Fourier transform processor or a fast Fourier transform processor that can only be used for a sp...

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Problems solved by technology

However, for power points that are not 4 or 8, such as 128 or 2048, if a single algorithm technology can only be calculated with Radix-2, the number of complex multipliers will also increase significantly, increasing the area occupied by the circuit.

[0005] In addition, the known OFDM processor can only be applied to one wireless communication standard due to the limitation of its own fast Fourier transform processor. For devices that are applicable to multiple wireless communication standards, it may be necessary to increase the OFDM processor. Therefore, a prerequisite for the OFDM processor to be applicable to a variety of wireless communication standards is to have a fast Fourier transform processor that can handle a variety of point data, and this is the current chip The direction of the designer's efforts

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