Article

Differential Modulation for Bidirectional Relaying With Analog Network Coding

Sch. of Electron. & Comput. Sci., Peking Univ., Beijing, China
IEEE Transactions on Signal Processing (Impact Factor: 3.2). 08/2010; 58(7):3933 - 3938. DOI: 10.1109/TSP.2010.2046441
Source: IEEE Xplore

ABSTRACT In this correspondence, we propose an analog network coding scheme with differential modulation (ANC-DM) using amplify-and-forward protocol for bidirectional relay networks when neither the source nodes nor the relay knows the channel state information (CSI). The performance of the proposed ANC-DM scheme is analyzed and a simple asymptotic bit error rate (BER) expression is derived. The analytical results are verified through simulations. It is shown that the BER performance of the proposed differential scheme is about 3 dB away from that of the coherent detection scheme. To improve the system performance, the optimum power allocation between the sources and the relay is determined based on the simplified BER. Simulation results indicate that the proposed differential scheme with optimum power allocation yields 1-2 dB performance improvement over an equal power allocation scheme.

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    • "The beamforming design requires the channel state information (CSI) of the LR and/or the UR priori. The physical layer security can be used in many application senarios [5] [6] [7], e.g., the two-way relaying [11] [12] [13]. "
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    • "Unlike [8] "
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    • "Then based on the above theorem, a simple differential signal detector is developed to recover the desired signal s(t) at source T 2 . In the later performance analysis section, we assume that h 22 (t) is perfectly cancelled [14], [18]. However, in practice, the estimation error will introduce some performance degradation which depends on estimation accuracy of h 22 (t). "
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