Massive Multiple Input Output (MIMO) is a promising technique for communications due to the high data transmission rate. To harvest benefit from massive MIMO, it necessary have accurate channel estimates. Such channels often exhibit sparsity in virtual angular domain. This paper proposes dichotomous coordinate descent (DCD) based algorithm joint sparse estimation domain orthogonal-frequency-div...

We consider, in a string theory framework, physical processes of phenomenological interest in models with a low string scale. The amplitudes we study involve tree-level virtual gravitational exchange, divergent in a field-theoretical treatment, and massive gravitons emission, which are the main signatures of this class of models. First, we discuss the regularization of summations appearing in v...

This paper presents elastic buffers (EBs), an efficient flow-control scheme that uses the storage already present in pipelined channels in place of explicit input virtual-channel buffers (VCBs). With this approach, the channels themselves act as distributed FIFO buffers under congestion. Without VCBs, and hence virtual channels (VCs), deadlock prevention is achieved by duplicating physical chan...

Fully adaptive routing with less virtual channels is of technical trend in MPP interconnection network design. However, imbalance of load offsets performances of many schemes. In this paper we give a fully adaptive load balanced routing algorithm called VBMAR. A new design tool called crossed turn model (CTM) is proposed to solve complex deadlock problems across virtual networks while keep the ...

In this paper we present a new approach to model the effect of virtual channel multiplexing in high-speed interconnection networks. Previous studies have used a method proposed by Dally to model the effect of virtual channel multiplexing. His method is based on a Markov process and loses its accuracy as the traffic increases because of the blocking nature of the wormhole-switched networks. Our ...