Design of PR NMDFB based up and down converters for transmit downlink and receive uplink of combined 3GPP LTE and UMTS radios

  • Authors:

  • Fredric J. Harris;Elettra Venosa;Xiaofei Chen;Chris Dick

  • Affiliations:

  • Department of Electrical and Computer Engineering, San Diego State University, San Diego, USA 92182-1309;Department of Electrical and Computer Engineering, San Diego State University, San Diego, USA 92182-1309;Department of Electrical and Computer Engineering, San Diego State University, San Diego, USA 92182-1309;Xilinx Corp, San Jose, USA 95124

  • Venue:
  • Analog Integrated Circuits and Signal Processing
  • Year:
  • 2014

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Abstract

In this paper we present a novel application of perfect reconstruction (PR), non-maximally decimated (NMD) filter banks whose assembly gives life to compact digital up converter and digital down converter for combined Third Generation Partnership Protocol, Long Term Evolution radios and Universal Mobile Telecommunications System radios, which are Wideband Code Division Multiple Access based. The design of the PR NMD analysis---synthesis chains in both transmit downlink and receive uplink has been optimized to maximize the performance according to the specific application scenario. In the receive uplink an 80-path, 40-to-1, PR NMD polyphase down converter channelizer accomplishes the pre-processing task of decomposing the whole input frequency range and of aliasing all the spectral fragments to base-band while reducing the signal sample rate. A selector block is in charge of connecting the ports, which contain the fragments belonging to the same band, to a proper PR 2-to-N up converter channelizer, which synthesizes them in base-band. The dual architecture, composed of small N-to-2 polyphase down converters followed by an 80-path, 2-to-40, up converter, has been designed for the transmit downlink. The down converters accomplish the pre-processing task of decomposing the input spectra and of simultaneously aliasing their fragments to base-band while reducing the input sample rate to 7.68 Msps. The 80-path, 1-to-40 up converter, accomplishes the task of recombining the spectral fragments at the desired center frequencies while increasing the signal sample rate to 307.2 Msps.