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In wireless communication networks, performance goals are often conflicting with each other. For example, in point-to-point multi-input-multi-output (MIMO) links, spectrum efficiency and reliability are in a tradeoff relation; in ad-hoc wireless net-works, we need to sacrifice throughput to decrease packet delay. In this dissertation, we investigate problems on the diversity-multiplexing tradeoff (DMT) in cellular wire-less communication networks and problems on the throughput-delay tradeoff in ad-hoc wireless networks. We first consider two topics on the DMT in cellular uplinks (or multiple-access channels, MACs): (1) the diversity-multiplexing-delay tradeoff (DMDT) in a random-access scenario and (2) an explicit construction of space-time coding scheme achieving the DMT. For the random-access scenario, we propose an incremental-redundancy au-tomatic repeat request (IR-ARQ) scheme. We prove that our scheme successfully ex-ploits both ARQ diversity and joint-decoding advantage, and achieves a better DMT than other existing protocols, such as Tsatsanis et al.’s network-assisted diversit