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In order to realize improving signal detection probability using interference canceler and multi-system detection techniques in spectrum sharing environment in cognitive radio of satellite and terrestrial system, it is required to classify the digital modulation type in an environment without handshaking between the transmitter and receiver. The previous methods can hardly classify modulation type...
We propose an adaptive layered space-frequency equalization (ALSFE) structure to deal with the multiple-input multiple-output (MIMO) time-varying frequency selective channels, where at each stage of detection, a group of selected data streams are detected and are then cancelled from the received signals. Two types of adaptive channel estimation approaches are employed for ALSFE, assuming respectively...
This paper proposes a novel blind receiver for multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) systems, where blind source separation (BSS) and V-BLAST are combined to perform layered space-time equalization without training sequences. It is shown that the proposed system significantly improves the performance compared to using BSS only and can approach the...
In this paper, we study the power consumption in relay networks of the 60 GHz wireless communication based on amplify-and-forward (AF) and decode-and-forward (DF) relaying strategies. We propose a total power consumption model including drive power, decoding power, and power consumption of power amplifier (PA). This model is formulated as a function of drive power, which gives an easy access to the...
A computationally efficient multi-criteria ranking based greedy (MCRG) algorithm is proposed for physical resource block (PRB) allocation in the fourth generation (4G) systems, where the users' utilities are ranked with multiple criteria, to enhance the performance of the basic greedy algorithm. The MCRG algorithm not only outperforms the previous single criterion ranking based greedy algorithm in...
We propose an optimal asymmetric resource allocation scheme with limited feedback for wireless relay systems based on orthogonal frequency division multiplexing (OFDM) modulation. Unlike the previous work, we assume that the bits transmitted over the same subchannel from the source to the relay may be distributed over different subchannels when being forwarded from the relay to the destination. This...
This paper presents a continuous phase modulation (CPM) based single-carrier frequency-domain equalization (CPM-SC-FDE) structure for broadband wireless communication systems. The proposed structure combines the advantages of the frequency diversity and low complexity of SC-FDE and the energy efficiency of CPM. Simulation results show that, the proposed CPM-SC-FDE structure provides a better performance...
We propose the optimal resource allocation for wireless multi-destination relay systems with orthogonal frequency division multiplexing (OFDM) modulation, which includes subchannel allocation (SA), subchannel pairing (SP), and joint source-relay power allocation (PA). Our work is different in that we consider a practical downlink OFDM based cooperative network, where the relay is used to help the...
This paper investigates the effect of using different optimization criteria for dynamic subcarrier allocation in a single carrier - frequency division multiple access (SC-FDMA) system. Simulation results show that using the minimum bit error rate (BER) as the optimization criterion has the best BER performance and an almost optimal capacity performance. The other criteria referred to as maximum spectral...
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