2010 **Abstract:** This paper investigates the capacity of a wireless two-way relay channel in which two end nodes exchange information via a relay node. The capacity is defined in the information-theoretic sense as the maximum information exchange rate between the two end nodes. We give an upper bound of the capacity by applying the cut-set theorem. We prove that this upper bound can be approached in low SNR region using "separated" multiple access for uplinks from the end nodes to the relay in which the data from the end nodes…

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“…After that, the relay maps r to 1 2 x x ⊕ according to the PNC mapping in [2]. As a result, in this new scheme, the relay can obtain 1 2 x x ⊕ with almost full rate [8][9][10]. This example shows that the proposed scheme may outperform the MIMO NC scheme significantly.…”

confidence: 99%

“…After that, the relay maps r to 1 2 x x ⊕ according to the PNC mapping in [2]. As a result, in this new scheme, the relay can obtain 1 2 x x ⊕ with almost full rate [8][9][10]. This example shows that the proposed scheme may outperform the MIMO NC scheme significantly.…”

confidence: 99%

“…In Two-Way Relay Channel (TWRC), physical layer network coding (PNC) [1] is an attractive transmission scheme that can approach the TWRC capacity in theory under perfect synchronization [2], [3] and can boost the wireless system performance in practice under non-perfect synchronization [4], [5]. In PNC, the transmission can be divided into uplink phase and downlink phase.…”

confidence: 99%

“…PLNC can further be classed into two categories -PNCF (PNC over finite field) and PNCI (PNC over infinite field) -according to whether the network coding field adopted is finite or infinite [3]. The capacity of TWRC with PLNC is higher than the traditional communication strategies [4,5]. The design of modulation suited for TWRC with PLNC can be BPSK or QPSK [6], and an unconventional 5-ary modulation which is optimized according to the channel condition [7].…”

confidence: 99%