||Wireless communications is required to transmit quantity of data more and more. The important studying topic is how to transmit the same quantity of data in a shorter period of time. Recently, two-way wireless communication is a popular type of communication technology, where two terminal nodes transmit simultaneously to each other with the help of the relay node. The physical layer network coding can further improve bandwidth efficiency. On the other hand, differential encoding is not required to transmit pilot symbols for channel estimation, so it does not cause rate loss. It is also a communication technology worth studying. |
In this thesis, we study differential encoding for two-phase two-way wireless transmission with the single-relay for amplify-and-forward (AF) and decode-and-forward (DF). First, we compare existent techniques under the same conditions. We use M-PSK (phase-shift keying) modulation, and do computer simulations under different channel models. We also study three-phase two-way wireless transmission, and compared two-phase transmission with three-phase transmission based on the same transmission rate.
Besides, in this thesis, we propose a new decode-and-forward scheme using M-PSK signals. This scheme uses the received signals at the relay in previous two time slots to estimate the reference signal, and then decide the current signal according to the estimated reference signal. Simulation results show that the proposed scheme has the best error performance.
|| R. Ahlswede, N. Cai, S.-Yen R. Li, and R. W. Yeung, “Network Information Flow,” IEEE Transactions on Information Theory, vol. 46, no. 4, pp. 1204-1216, July 2000.|
 R. Koetter and M. Medard, “Beyond Routing: An Algebraic Approach to Network Coding,” IEEE Infocom, 2002.
 S.-Yen R. Li, R. W. Yeung, and N. Cai, “Linear Network Coding,” IEEE Transactions on Information Theory, vol. 49, no. 2, pp. 371-381, Feb. 2003.
 T. Ho, R. Koetter, M. Medard, D. R. Karger, and M. Effros, “The Benefits of Coding over Routing in a Randomized Setting,” IEEE International Symposium on Information Theory, 2003.
 R. Dougherty, C. Freiling, and K. Zeger,, “Insufficiency of Linear Coding in Network Information Flow,” IEEE Transactions on Information Theory, vol. 51, no. 8, pp. 2745-2759, Aug. 2005.
 T. Cui, F. Gao, and C. Tellambura, “Differential modulation for two-way wireless communications: a perspective of differential network coding at the physical layer,” IEEE Transactions on Communications, vol. 57, no. 10, pp. 2977-2987, Oct. 2009.
 L. Song, Y. Li, A. Huang, B. Jiao, and A. V. Vasilakos, “Differential modulation for bidirectional relaying with analog network coding,” IEEE Transactions on Signal Processing, vol. 58, no. 7, pp. 3933-3938, July 2010.
 W. Guan and K. J. Ray Liu, “Performance Analysis of Two-Way Relaying with Non-Coherent Differential Modulation,” IEEE Transactions on Wireless Communications, vol. 10, no. 10, pp. 2004-2014, June 2011.
 W. C. Jakes, Microwave Mobile Communications. Piscataway, NJ: IEEE Press, 1993.
 M. F. Pop and N. C. Beaulieu, “Limitations of sum-of-sinusoids fading channel simulators,” IEEE Transactions on Communications, vol. 49, no. 4, pp. 699–708, Apr. 2001.