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In multi-agent system, agents need autonomy and collaboration to accomplish a complex task. Contract net protocol (CNP) is coordination mechanism often used in a multi-agent system. Due to the limitations inherent in the conventional CNP, this paper proposes a Norm-based CNP to improve the efficiency and effectiveness of the coordination processes in a(More)
This paper proposes a differential modulation scheme using amplitude-phase shift keying (APSK) signals for distributed MIMO systems where neither the transmitter nor the receiver knows channel knowledge. The bandwidth efficiency of the proposed scheme is the same as V-BLAST scheme, and it can be applied to the systems with any number of transmit and receive(More)
This paper proposes a low complexity differential modulation scheme for multiple-antenna systems where neither the transmitter nor the receiver knows channel knowledge. Our scheme is based on quasi-orthogonal codes. We consider a wireless system with four transmit antennas. At the transmitter, symbol pairs are jointly mapped to construct quasi- orthogonal(More)
This paper proposes a differential en/decoding scheme for the modified Vertical-Bell Labs layered space-time (V-BLAST) system, where each spatially multiplexed data stream is intentionally inserted with delay offset. The proposed scheme can use only one receive antenna to detect the transmitted signals, whereas neither the transmitter nor the receiver knows(More)
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