The restricted audio quality of today’s telephone networks is mainly due to the narrowband (NB) limitation to the frequency range from about 300 Hz to 3.4 kHz. Meanwhile, codecs for wideband (WB) telephony (50 Hz to 7 kHz) exist with significantly improved speech intelligibility and naturalness. However, the broad introduction of wideband speech coding will require strong efforts of both networ...

In this paper, we propose a novel direction of arrival (DOA) estimation method for wideband signals with sensor arrays. The proposed method splits the wideband array output into multiple frequency sub-channels and estimates the signal parameters using a digital channelization receiver. Based on the output sub-channels, a channelization-based incoherent signal subspace method (Channelization-ISM...

This paper studies the characteristics of an Ultra-Wideband (UWB) communication system employing Impulse Radio techniques and, specifically, the effects of the matched filter of a correlator receiver in the performance of such a system. Such effects are evaluated in terms of the Bit Error Rate (BER) for a Binary Pulse Position Modulation (BPPM) scheme, in an indoor multipath propagation channel...

With their huge bandwidth and correspondingly abundant channel diversity and fine tim-ing resolution, ultra-wideband (UWB) systems have proved able to provide higher com-munication capacity and better ranging accuracy than other narrowband systems. How-ever, to achieve this, accurate channel estimation and synchronization must be obtained,and efficient diversity combining algori...

Here we present a Continuous Wave radar receiver with a digital noise cancellation circuit. The leakage signal is cancelled by the mixer/PLL followed by an analog low pass filter also works as anti aliasing filter for the Ato-D. The digital signal processing after A-to-D cancels the analog thermal noise from front end which is mathematically AWGN in nature. We assume synchronous CDMA transmissi...

Ultra wideband radio (UWB) is a new wireless technology that uses narrow pulses to transmit information. Implementing an “all-digital” UWB receiver has numerous potential benefits ranging from low-cost and ease-of-design to flexibility. Digitizing an RF signal near the antenna, however, introduces its own set of challenges and has traditionally been considered infeasible. A high-speed, high-res...

Original scientific paper This paper presents coded differential TR (cDTR) receiver that transmits extra bit by mapping information in K different orthogonal codes. The performance of the coded DTR is analyzed and compared with the conventional DTR. Throughout the analysis, the performance of receivers in terms of bit error probability (BEP), data rate and receiver complexity are assessed. The ...

Ultra-wideband radio, conveying data by transmitting narrow pulses without carrier, is a promising communication technology. Transmitted reference method can work with cross-correlation receivers, which have simple channel estimation and multipath diversity acquirement as well as low sampling frequency, to make a low cost application available. Optimal and suboptimal single user receivers for u...

The easiest way to estimate MMSE equalizers for CDMA is to use a training sequence: this information, along with an accurate estimate of the covariance matrix of the received data and some i.i.d. assumptions on the symbols is sufficient. In actual wideband CDMA proposals, a rather large portion of the bandwidth is reserved for this training overhead. Although it provides for a robust channel (e...