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Orthogonal frequency division multiplexing (OFDM) has been identified as a potential method to enhance the performance of wireless communication links degraded by cosite interference, impulsive noise and frequency selective fading. In this paper, an OFDM software defined radio (SDR) receiver based on a wideband substrate integrated waveguide (SIW) six-port circuit is described and analyzed. A six-port...
A co-simulation result of a Zero crossing BFSK demodulator with a frequency-hopped spread-spectrum receiver for wireless sensor applications in the 863-870-MHz ISM band is presented. The structure is suitable for Zigbee (IEEE 802.15.4) receiver. The zero crossing demodulator uses a digital one-shot circuit as a differentiator and a pulse width equalization circuit. The proposed demodulator is able...
The implementation of optimum detector for Chirp UWB system is complicated. autocorrelation demodulation (ACD) is a promising suboptimal demodulation method with low complexity. However, its poor performance is bottleneck. In this paper, chirp UWB system with an improved multiple-symbol ACD detector is proposed. Two different decision rules: ML and FB are proposed. The performance of ML detector is...
We propose an iterative soft detection algorithm based on the QR decomposition and M-algorithm (soft-QRD- M) for MIMO-OFDM incorporating error correction coding. The soft-QRD-M step generates approximate a posteriori probabilities (APPs) with significant computational savings over the optimal sum-product algorithm. Simulation results show comparable performance of the soft-QRD-M detector and SPA in...
We propose a more accurate method to analyze multilevel frequency-shift-keying frequency-hopping code-division multiple-access (MFSK/FH-CDMA) wireless communication systems using ldquoone-hitrdquo FH patterns, instead of random FH patterns. By also removing the over-optimistic symbol-synchronous assumption, the new method provides a more realistic performance analysis as the MFSK modulation may result...
Orthogonal frequency division multiplexing (OFDM) is the modulation scheme of choice for digital video broadcasting-handheld (DVB-H), which is required to operate under high mobility conditions resulting in significant Inter-carrier Interference (ICI). To mitigate ICI, several cancellation schemes have been proposed but they require reliable channel information at the receiver which is quite challenging...
Ultra-wideband (UWB) systems possess several distinct features such as very high data rate, large multipath or frequency diversity and improved ranging precision while requiring low-power low-complexity transceivers. Among the different modulation schemes, differential PSK is an attractive option because it does not require channel estimation, and hence reduces implementation complexity. This paper...
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