Approximate minimum SER precoding for spatial multiplexing over Ricean channels

Wang, Wei; Shen, Gang; Jin, Shan; Wang, Dongyao; Chen, Jiming

doi:10.1109/pimrc.2009.5450205

Cited by 4 publications

(1 citation statement)

References 15 publications

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“…If there exists LoS between the PU link, transmit power tends to be allocated more onto it, it is possible to leave more space for the secondary system. In general, if there exists LoS or correlation between SU to the PU link or the SU links, the design may depend on the model and is involving, including both DOF calculation or precoding design [52], [53]. The general design by taking correlation into account is beyond our scope.…”

Section: Line-of-sight Channelsmentioning

confidence: 99%

Spatial-Frequency Signal Alignment for Opportunistic Transmission

Maaref

2014

IEEE Trans. Signal Process.

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In this paper, we investigate opportunistic transmission based on signal alignment for multiple-input multiple-output (MIMO) orthogonal frequency-division multiplexing (OFDM) cognitive radio (CR) systems, where both primary and secondary users have multiple antennas. In the studied scenario, primary users are transmitting based on OFDM and secondary users generate interference-free transmission to the primary users by using both the spatial and frequency space leftover by the primary system. Moreover, inter-and intra-interference among secondary users are considered as well. The number of symbols that can be transmitted by each secondary user satisfying all interference-free constraints is obtained. Precoding matrix design will be discussed for perfectly-and partially-aligned transmission. Two chordal-distance based schemes, called as exhaustive search algorithm and heuristic algorithm, will be developed for each case. Compared to the traditional time-division multiple-access (TDMA) scheme, the proposed scheme can support more interference-free symbols to be transmitted by secondary users simultaneously.Index Terms-Cognitive radio (CR) network, interference-free transmission, signal alignment.

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Section: Line-of-sight Channelsmentioning

confidence: 99%