Patent
Ram-based fast fourier transform unit for wireless communications
Ying Chen,Barrett J. Brickner +1 more
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TLDR
In this article, a wireless communication technique enables fast Fourier transforms (FFTs) and inverse Fast Fourier Transform (IFFTs) to be performed with reduced latency and reduced memory requirements.Abstract:
A wireless communication technique enables fast Fourier transforms (FFTs) and inverse fast Fourier transforms (IFFTs) to be performed with reduced latency and reduced memory requirements. In particular, an FFT/IFFT unit receives input data representative of a communication symbol. The FFT/IFFT unit applies an FFT operation to the input data to generate intermediate data. The FFT/IFFT unit stores the intermediate data in a random access memory (RAM). The intermediate data stored in the RAM may override data used as input to the FFT operation. The FFT/IFFT unit selectively addresses the RAM to retrieve the intermediate data in a desired output order. For example, the FFT/IFFT unit may output the intermediate data in the same sequential order as the FFT/IFFT unit received the input data.read more
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References
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Patent
OFDM synchronization demodulation circuit
TL;DR: In this article, a constellation analyzing circuit analyzes the constellation of demodulated symbols of predetermined carriers in the demoded OFDM multiplex signal signal, and a clock detection circuit controls the detected clock based on the frequency deviation detected by the clock frequency deviation detection circuit.
Patent
Transceiver apparatus employing wideband FFT channelizer and inverse FFT combiner for a multichannel communication network
TL;DR: In this paper, a physically compact, multichannel wireless communication transceiver architecture employs overlap and add or polyphase signal processing functionality, previously applied to narrowband speech analysis research, for wideband signal processing.
Journal ArticleDOI
A pipeline processor for mixed-size FFTs
TL;DR: A method for performing fast Fourier transforms of various sizes simultaneously in one pipeline processor that consists of several stages of butterfly computational elements alternated with delay-switch-delay modules that reorder the data between the butterfly stages.
Patent
Fast fourier transform apparatus and method
Mark J. Dapper,Michael J. Geile,Terrance J. Hill,Harold A. Roberts,Brian D. Anderson,Jeffrey Brede,Mark S. Wadman,Robert J. Kirscht,James J. Herrmann,Michael J. Fort,Steven P. Buska,Jeff Solum,Debra Lea Enfield,Darrell Berg,Thomas Smigelski,Thomas C. Tucker,Joe Hall,John M. Logajan,Somvay Boualouang,Heng Lou,Mark D. Elpers,Matt Downs,Tammy Ferris,Adam Opoczynski,David S. Russell,Calvin G. Nelson,Niranjan R. Samant,Joseph F. Chiappetta,Scott Sarnikowski +28 more
TL;DR: In this paper, an apparatus for providing a Fast Fourier Transform (FFT) and an inverse FFT is provided, which consists of a radix-N core consisting of at least N multipliers and an array of N-times-N adder-subtracter accumulators.
Patent
Fast fourier transforming apparatus and method, variable bit reverse circuit, inverse fast fourier transforming apparatus and method, and ofdm receiver and transmitter
Yuji Nakai,Akihiro Furuta +1 more
TL;DR: In this paper, the fast Fourier transform is performed on a symbol stored in a random access memory (RAM) by a butterfly operation unit in accordance with a RAM address generated by RAM address generator.