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In this paper we study the design and analysis of spatially coupled repeat-accumulate (SC-RA) codes over a three-terminal half-duplex relay channel. The channels between the terminals are considered binary input additive white Gaussian noise (BIAWGN) channels, while decode-and-forward (DF) relaying is considered at the relay. We present low complexity density evolution analysis for the SC-RA code...
Two-dimensional magnetic recording (TDMR) relies on advanced signal processing and coding techniques to enable storage of data at higher densities. Various detection and decoding schemes have been proposed in the literature. In this paper, a recently proposed joint detection and decoding scheme known as the joint Viterbi detector decoder (JVDD) is presented for TDMR channels. The JVDD operates on...
The joint Viterbi detector/decoder (JVDD) is a recently proposed receiver scheme that does both detection and decoding on a single trellis rather than doing detection on a trellis and decoding on factor graph as in the conventional iterative detector today. The JVDD attempts to return minimum metric legal codeword (MMLC) that is the optimum decision over an AWGN/ISI channel. However in so doing, the...
This paper discusses the implementation of open doorway detection in an indoor environment by utilizing the low cost narrow band radar system, i.e. USRP (Universal Software Radio Peripheral) based test bed. OFDM waveform is considered due to its flexibility of subcarrier occupation and ability of reusing the same waveforms as communication signals. We propose power comparison detection method and...
In this paper, we propose a sub-optimal technique to solve problem of power allocation in cognitive radio (CR) OFDM-based system. This technique called full-filling based on windowing the CR user's signal and maximizing the power allocation at good sub-carrier positions of CR user. Thank to the interference reduction of windowing technique, the complexity of power allocation optimization problem with...
In bi-directional multi-antenna relaying with binary network coding, antenna selection can offer the benefits of full diversity at lower complexity. However, the rate at which the antennas are switched can also contribute to the complexity of the relaying scheme. In this paper, we explore a way of reducing this switching rate and study the implications of a reduced switching compared to the optimal...
Two-way relaying is a way of improving the bandwidth efficiency of a half-duplex relay system. In such scenarios, network coding can also be applied to improve the system if there exist sufficient degrees of freedom to decode the received messages at the relay node. In this paper, we look at two specific transmission schemes employed at the multi-antenna relay node and analyze their performance by...
This paper presents uniplanar ultra-wideband (UWB) pulse generators producing full-band as well as dual-band UWB pulses. New uniplanar UWB bandpass filters have been designed by using coplanar waveguide and the filters are cascaded with the Gaussian pulse generator to reshape the pulses as defined by the US Federal Communication Commission (FCC). Experimental results show that the generated pulses...
We present the performance comparison of delay transmit diversity (DTD), orthogonal transmit diversity (OTD) and space time spreading (STS) schemes in the downlink multicell CDMA systems. The performance was analyzed using the RAKE receiver and the decorrelating receiver under multiuser and multipath conditions. The analysis highlights the effect of multiple access interference on the performance...
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