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Design and Implementation of a Tunable Frequency Channelizer on FPGA

Safaeian, Ramin | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 44361 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Tabandeh, Mahmoud
  7. Abstract:
  8. Nowdays, many of communication systems working together. The fist part of each communication system is related to separating a desired part of system input signal. This is called channelisation. Channelization is a process where single, few, or all channels from a certain frequency band are separated for further processing. The separation of single channel is usually done by down-conversion followed by filtering and optional sample-rate conversion. A straightforward implementation for multi channel sepration, which is also the traditional implementation of wideband channelizer, is to simply use a single-channel channelizer for each channel. A few applications require that an input signal be seprated into a number of different frequency channels. If these channels are of equal width and equally spaced, then techniques such as the fast fourier transform (FFT) or pipelined frequency transform (PFT) can be employed. For the general case of frequency bands of different width and unevenly distributed across the spectrum, then the most common solution is to employ a number of Digital Down Converters (DDC), each responsible for an individual channel. The Tunable Pipelined Frequency Transform (TPFT) provides similar functionality to a stack of DDCs. It gives the user freedom to specify channels by center frequency and bandwidth, define filter characteristics and reconfigure to another frequency plan as required. Furthermore, spectral shaping masks can also be directly applied onto the outputs within the architecture itself. This thesis will provide a description of the TPFT architecture and will highlight the advantages of this technique over competing solution
  9. Keywords:
  10. Field Programmable Gate Array (FPGA) ; Finite Impulse Response (FIR)Filters ; Polyphase Filter Bank ; Channelizer ; Reconfigurable

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