Coalitional Games for Transmitter Cooperation in MIMO Multiple Access Channels
Coalitional Games for Transmitter Cooperation in MIMO Multiple Access Channels
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DOI：
10.1109/tsp.2013.2290496
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发表时间：
2012-06
影响因子：
5.4
通讯作者：
S. Yerramalli;R. Jain;U. Mitra
中科院分区：
文献类型：
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作者：
S. Yerramalli;R. Jain;U. Mitra
共享无线信道的节点之间的协作对于在无线网络中实现更高的吞吐量变得越来越必要。确定无线网络中理性节点之间协作的可行性和稳定性对于理解协作行为具有重要意义。本文利用合作博弈论的框架研究了多址信道上发射机大联盟信令的稳定性。通过以分区形式对TX之间的合作博弈进行建模，准确地表示了每个TX所经历的外部干扰。单用户解码和连续干扰消除策略在接收机进行检查。发送者合作是稳定的，当且仅当博弈的核心（大联盟效用的所有划分的集合，使得没有联盟偏离）是非空的。确定合作的稳定性一般是一个co-NP-complete问题。对于一个单用户解码接收机，发射机合作被证明是稳定的，在高和低信噪比，而对于一个干扰消除接收机具有固定的解码顺序，合作是稳定的，只有在低信噪比和不稳定的高SNR。当在解码顺序之间允许时间共享时，使用效用函数的近似下界示出TX协作在高SNR下也是稳定的。因此，本文表明，理想的零成本TX合作MAC是稳定的，并提高了可实现的速率为每个单独的用户。
Cooperation between nodes sharing a wireless channel is becoming increasingly necessary to achieve higher throughputs in a wireless network. The problem of determining the feasibility and stability of cooperation between rational nodes in a wireless network is of great importance in understanding cooperative behavior. This paper addresses the stability of the grand coalition of transmitters signaling over a multiple access channel using the framework of cooperative game theory. The external interference experienced by each TX is represented accurately by modeling the cooperation game between the TXs in partition form. Single user decoding and successive interference cancelling strategies are examined at the receiver. Transmitter cooperation is stable, if and only if the core of the game (the set of all divisions of grand coalition utility such that no coalition deviates) is nonempty. Determining the stability of cooperation is a co-NP-complete problem in general. For a single user decoding receiver, transmitter cooperation is shown to be stable at both high and low SNRs, while for an interference cancelling receiver with a fixed decoding order, cooperation is stable only at low SNRs and unstable at high SNR. When time sharing is allowed between decoding orders, it is shown using an approximate lower bound to the utility function that TX cooperation is also stable at high SNRs. Thus, this paper demonstrates that ideal zero cost TX cooperation over a MAC is stable and improves achievable rates for each individual user.