In this contribution, the direct conversion receiver (DCR) has been revisited and its properties have thoroughly been studied in detail. Contrary to common practice, our main interest is focused on the investigation of DCR performance degradation in conjunction with the processing of ultra-wideband FDM-signals. To this end, all potential DCR error sources have been identified and introduced int...

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In this paper, the design requirements of different mixers for direct conversion receivers are discussed. Special attention has been paid into the detection of amplitude-modulated RF signal envelope. Three active mixers have been implemented to investigate the discussed requirements by using a 0.35-μm, 25-GHz BiCMOS technology. The same process allows an objective comparison between the differe...

The next generation of receivers for applications such as radio astronomy, spectrum surveillance, and frequency-adaptive cognitive radio will require the capability to digitize very large bandwidths in the VHF low band (30 to 100 MHz). However, methodology for designing such a receiver is not well established. The difficulties of this design are numerous. There are various man-made interferers ...

In this paper, we address the problem of downlink detection in a mobile radio time division/code division multiple access multirate communication system employing a linear modulation. We focus on the detection of a group of intracell codes (ranging from a single one to all the active codes) rejecting both interference coming from the complementary set of undesired intracell codes and co-channel...

This paper presents a de-interleaved subsampling receiver architecture suitable for homodyne receivers. The proposed topology requires only a single branch to down-convert and extract the inphase (I) and quadrature (Q) baseband signals. Using a singlebranch receiver eliminates the I/Q mismatch issue of traditional direct down-conversion receivers. The simplicity of the proposed receiver archite...

This paper studies the bit error rate (BER) performance of non-coherent impulse-radio ultra wideband (IR-UWB) correlation receivers in the IEEE 802.15.3a channel for combined binary pulse amplitude modulation-pulse position modulation (BPAM-PPM) scheme. The BER performance is based on the channel averaged signal-to-noise ratio (SNR). The study includes simple transmitted reference (TR), differe...

This paper describes the limiting behavior of linear and decision feedback equalizers (DFEs) in single/multiple antenna systems employing real/complex-valued modulation alphabets. The wideband frequency-selective channel is modeled using a Rayleigh fading channel model with infinite number of time domain channel taps. Using this model, we show that the considered equalizers offer a fixed post d...