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We propose and analyze a generalized spatial modulation scheme, where depending on the bits to be transmitted a certain data symbol as well as a certain beamforming vector is chosen. The receiver then has to estimate both the used beamforming vector and the transmitted data symbol for being able to reconstruct the originally transmitted bit sequence. We analyze our scheme theoretically by deriving...
We present and analyze two different power allocation strategies for considerably improving the average bit error rate (BER) performance of wireless multihop systems with an arbitrary number of regenerative relay stations. In both cases, the power allocation is done based on instantaneous channel state information subject to an overall sum power constraint as well as possible additional per-node power...
We consider wireless multihop systems with regenerative relaying, where the data transmission between two peers is realized with the help of a certain number of intermediate estimate-and-forward relays. In this regard, we specifically deal with the problem of allocating appropriate transmit power levels to the source node and the various relay stations subject to both individual power constraints...
We present and analyze several adaptive modulation schemes for wireless multihop systems with regenerative relays. In particular, we consider both rate adaptation based on perfect channel state information (csi) of all hops as well as suboptimal strategies based on partial csi, which require only a very limited amount of feedback information and hence represent attractive approaches for practical...
We analyze the performance of switch-and-stay transmit diversity systems in presence of an erroneous feedback link. First of all, the analysis is conducted for arbitrary fading distributions and a rather general class of performance functions. Assuming a certain feedback error probability Pe, we determine the distribution of the signal-to-noise ratio (SNR) at the receiver- side and we provide a generic...
We analyze the performance of multiple-input multiple-output (MIMO) systems employing orthogonal space-time block codes (STBC) in general Nakagami-m fading channels with channel coefficients having not necessarily identical fading parameters and average power gains. First, we derive an exact analytical closed-form expression for the average bit error rate (BER) of M-ary quadrature amplitude modulation...
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