This paper proposes a novel robust and self-organizing architecture for mobile ad hoc networks. The proposed architecture, Space Division Multiple Access (SDMA), relies on user position information and provides users access to the communication channel based on their spatial locations. SDMA divides the geographical space, where the users are located, into smaller spaces. The key element of the design is a one-to-one map between the space divisions and the bandwidth divisions of time slots, frequency divisions, etc. Therefore, SDMA is compatible with any multiple access scheme such as TDMA, FDMA, CDMA, etc. The paper presents the SDMA architecture and discusses its ad-vantages and disadvantages. Moreover, enhanced SDMA is discussed for increased bandwidth efficiency.
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