Base station (BS) cooperation technologies are expected to improve user throughput at the cell edges in a cellular system [1]-[3]. Since the performance of a BS cooperation method depends on the condition of the propagation channel, especially the difference in the received signal strengths from surrounding BSs, it is important to investigate the transitions of the signal strengths at a mobile ...

Religion and ritual have been characterized as costly ways for conditional cooperators to signal their type, and thus identify and interact with one another. But an effective signal may be prohibitively expensive: if the cost of participation is too small, freeriders may send the signal and behave selfishly later. However, if the ritual reveals only the average level of signaling in a group, fr...

The performance of user-cooperation in a multi-access network is compared to that of using a wireless relay. Using the total transmit and processing power consumed at all nodes as a cost metric, the outage probabilities achieved by dynamic decode-and-forward (DDF) and amplify-and-forward (AF) are compared for the two networks. A geometry-inclusive high signal-to-noise ratio (SNR) outage analysi...

In the prisoners’ dilemma game, the only evolutionarily stable strategy is defection, even though mutual cooperation yields a higher payoff. Building on a paper by Robson (1990), we introduce mutants who have the ability to send a (costly) signal, i.e., the “secret handshake,” before each round of the game and to condition their actions on whether or not they observe the same signal from their ...

The broadcast nature of wireless communications suggests that a source signal transmitted towards the destination can be “overheard” at neighboring nodes. Cooperative communication refers to processing of this overheard information at the surrounding nodes and retransmission towards the destination to create spatial diversity, thereby to obtain higher throughput and reliability. In this paper w...

In this letter, we propose a novel precoding scheme for base station (BS) cooperation in downlink cellular networks that allow overlapped clusters. The proposed precoding scheme is designed to mitigate the overlapping-BS interference by maximizing the so-called clustered virtual signal-to-interferenceplus-noise ratio (SINR). Simulations show that with the proposed scheme, overlapped clustering ...

In the present contribution the problem of signal interception in a virtual MIMO scenario is considered. A possible distributed signal interception algorithm which is able to detect and discriminate between two similar OFDM signals is analyzed. Distributed and stand-alone algorithms are compared through simulations in a multipath environment and the different levels of cooperation required amon...

Hitchhiker organisms have been known since the earliest days of international travel, but changes in global trade mean that there are more now than ever before. They include a number of serious invasive species and are among the most difficult of quarantine problems to manage. Invasive animals transported as hitchhikers, other than plant pests, fall largely outside the international frameworks ...

—To improve the problems of noise amplification and error propagation of the fixed cooperation schemes in cooperative communications, a relay selection strategy is proposed based on the hybrid decode-amplify-forward protocol. It can adaptively determine cooperation schemes according to the Channel Status Information (CSI) of the source-relay. Then it selects the best relay from the candidate r...