![]() IEEEĬoexistence between 802.11 Wireless Local Area Network (WLAN) and radars operating in co/adjacent channel scenarios (notably 5 GHz) is a problem of considerable importance that requires new innovations. To reduce the complexity of the optimal receiver, several suboptimal decoders are analyzed, among which the one that discards the correlations between subcarriers is numerically found to perform close to the optimal one. Due to the radar interference, the received signal becomes correlated over time and across carriers. A multi-carrier Orthogonal Frequency Division Multiplexing (OFDM) communications system is lastly considered. Numerically, the designed constellation is shaped as a concentric hexagon for weak radar interference while it morphs into an uneven pulse amplitude modulation for strong interference. Complex-valued constellation design problems are next proposed, with the goal of either minimizing the error rate under a power constraint, or maximizing the transmission rate under both error rate and power constraints. ![]() For a single-carrier communications system, it is shown that a low power radar signal can be treated as Gaussian noise while a strong radar signal can be subtracted off the received signal, but in doing so one of the two signal dimensions is lost. This paper investigates how an unaltered radar system affects the performance of a communications receiver. Increasing demands for spectrum have necessitated the coexistence of communications and radar systems within the same band. ![]()
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