Babak Daneshrad

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Design and implementation of a highly optimized MIMO (multiple-input multiple-output) detector requires cooptimization of the algorithm with the underlying hardware architecture. Special attention must be paid to application requirements such as throughput, latency, and resource constraints. In this work, we focus on a highly optimized matrix inversion free(More)
Cooperative relays have recently been proposed and studied for mobile ad hoc networks. It has been shown that under perfect symbol synchronization, parallel relays with space-time modulation can yield more than 10dB power savings over conventional serial relays in a highly mobile environment. In this paper, we analyze the effect of synchronization errors on(More)
We present a link adaptation strategy for multipleinput multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) based wireless communications. Our objective is to choose the optimal mode that will maximize energy efficiency or data throughput subject to a given quality of service (QoS) constraint. We formulate the link adaptation problem as(More)
In this paper, a compact architecture for direct digital frequency synthesis (DDFS) is presented. It uses a smaller lookup table for sine and cosine functions compared to existing architectures, with minimal hardware overhead. The computation of the sinusoidal values is performed by a parabolic interpolation structure, thus only interpolation coefficients(More)
The implementation of wideband MIMO systems poses a major challenge to hardware designers due to the huge processing power required for MIMO detection. To achieve this goal with a complete VLSI solution, channel coding and MIMO detection are preferably separated so that each of them can be fitted into a single chip. In this paper, a comparative study is(More)
The third generation (3G) of cellular communications standards is based on wideband CDMA. The wideband signal experiences frequency selective fading due to multipath propagation. To mitigate this effect, a RAKE receiver is typically used to coherently combine the signal energy received on different multipaths. An effective multipath searcher is, therefore,(More)