This paper investigates joint wireless information and energy transfer in a two-user MIMO interference channel, in which each receiver either decodes the incoming information data (information decoding, ID) or harvests the RF energy (energy harvesting, EH) to operate with a potentially perpetual energy supply. In the two-user interference channel, we have four different scenarios according to the receiver mode -(ID1, ID2), (EH1, EH2), (EH1, ID2), and (ID1, EH2). While the maximum information bit rate is unknown and finding the optimal transmission strategy is still open for (ID1, ID2), we have derived the optimal transmission strategy achieving the maximum harvested energy for (EH1, EH2). For (EH1, ID2), and (ID1, EH2), we find a necessary condition of the optimal transmission strategy and, accordingly, identify the achievable rate-energy (R-E) tradeoff region for two transmission strategies that satisfy the necessary condition -maximum energy beamforming (MEB) and minimum leakage beamforming (MLB). Furthermore, a new transmission strategy satisfying the necessary condition -signalto-leakage-and-energy ratio (SLER) maximization beamforming -is proposed and shown to exhibit a better R-E region than the MEB and the MLB strategies. Finally, we propose a mode scheduling method to switch between (EH1, ID2) and (ID1, EH2) based on the SLER. Index Terms-Joint wireless information and energy transfer, MIMO interference channel, rank-one beamforming. O VER the last decade, there has been a lot of interest to transfer energy wirelessly and recently, radio-frequency (RF) radiation has become a viable source for energy harvesting. It is nowadays possible to transfer the energy wirelessly with a reasonable efficiency over small distances and, furthermore, the wireless sensor network (WSN) in which the sensors are capable of harvesting RF energy to power their own transmissions has been introduced in industry ( [1]- [4] and references therein). The energy harvesting function can be exploited in either transmit side [5]- [9] or receive side [10]- [13] . For the energy harvesting transmitter, energy harvesting scheduling and transmit power allocation have been considered and, for the energy harvesting receiver, the management of information decoding and energy harvesting has been developed. Furthermore, because RF signals carry information as well as energy, "joint wireless information and energy transfer" in conjunction with Manuscript
Similarly, Park and Clerckx performed research in identifying the achievable rate-to-energy tradeoff region in a two-user MIMO interference channel REF .
Joint Wireless Information and Energy Transfer in a Two-User MIMO Interference Channel
IEEE Transactions on Wireless Communications
IEEE Transactions on Wireless Communications
Computer Science Mathematics