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Network Coding for Intra-Cell Communications in OFDMA Networks

机译:OFDMA网络中小区内通信的网络编码

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摘要

In this letter, we consider a new communication scenario in cellular networks, which is called , for which user pairs within the same cell exchange information through the base station (BS). A network coding based protocol is proposed to assist ICC in OFDMA networks to improve the spectral efficiency. In the uplink, each user accesses the BS following the OFDMA principle, while in the downlink, the BS transmits to each of the user pairs using the OFDMA principle. To do so, the BS performs bit level XOR (BLX) operation on the information bits received from each user pair. The output is then transmitted back to the same user pair through subcarrier sharing. We formulate the joint uplink/downlink subcarrier assignment and power allocation problem to maximize the weighted sum rate. While the formulated problem is non-convex, an asymptotically optimal, yet low complexity algorithm is proposed. Simulation results are presented to verify that the proposed protocol outperforms subcarrier pairing and assignment schemes which require no subcarrier sharing in both uplink and downlink.
机译:在这封信中,我们考虑了蜂窝网络中的一种新的通信场景,称为,对于该通信场景,同一小区内的用户对通过基站(BS)交换信息。提出了一种基于网络编码的协议,以协助OFDMA网络中的ICC提高频谱效率。在上行链路中,每个用户遵循OFDMA原理访问BS,而在下行链路中,BS使用OFDMA原理向每个用户对发送。为此,BS对从每个用户对接收的信息比特执行比特级XOR(BLX)操作。然后,通过子载波共享将输出发送回相同的用户对。我们制定联合上行/下行子载波分配和功率分配问题,以最大化加权和速率。虽然所提出的问题是非凸的,但提出了一种渐近最优但低复杂度的算法。给出仿真结果以验证所提出的协议优于子载波配对和分配方案,该方案不需要在上行链路和下行链路中共享子载波。

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