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We propose a distributed medium access control (MAC) protocol called carrier sense multiple access with collision resolution (CSMA/CR) by extending the wireless CSMA/CD protocol. The proposed CSMA/CR protocol identifies a collision by additional sensing after data transmission starts. If one station detects a collision, it transmits a jam signal to stop the other stations' transmissions and then retransmits the data without backoff, which resolves the next collision that may occur. The throughput analysis shows that the proposed CSMA/CR protocol outperforms other conventional CSMA-based MAC protocols.