The transmission capacity of an ad-hoc network is the maximum density ofactive transmitters per unit area, given an outage constraint at each receiverfor a fixed rate of transmission. Most prior work on finding the transmissioncapacity of ad-hoc networks has focused only on one-way communication where asource communicates with a destination and no data is sent from the destinationto the source. In practice, however, two-way or bidirectional data transmissionis required to support control functions like packet acknowledgements andchannel feedback. This paper extends the concept of transmission capacity totwo-way wireless ad-hoc networks by incorporating the concept of a two-wayoutage with different rate requirements in both directions. Tight upper andlower bounds on the two-way transmission capacity are derived for frequencydivision duplexing. The derived bounds are used to derive the optimal solutionfor bidirectional bandwidth allocation that maximizes the two-way transmissioncapacity, which is shown to perform better than allocating bandwidthproportional to the desired rate in both directions. Using the proposed two-waytransmission capacity framework, a lower bound on the two-way transmissioncapacity with transmit beamforming using limited feedback is derived as afunction of bandwidth, and bits allocated for feedback.
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