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This paper examines differential binary modulation for wireless networks that utilize wireless relays to seek cooperative diversity and improved performance over Nakagami-m fading channels. A differential cooperative transmission scheme, referred to as differential amplify-and-forward (DAF), is introduced. The scheme requires no channel state information (CSI) at any node in the system. A differential detection is discussed. A set of analytical results pertaining to the probability density function (PDF) of the instantaneous signal-to-noise ratio (SNR) and average bit error rate (BER) are obtained. The analytical results are confirmed by numerical simulations. It is instrumental to apply the derived closed-from BER expression to evaluate system performance under Nakagami-m fading channels.
Date of Conference: 5-8 June 2005