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Cooperative communication can yield spatial diversity gains, but its performance can also suffer severely from the multiple carrier frequency offsets (MCFOs) induced by high-speed relative motion, in addition to Doppler spread. In orthogonal frequency-division multiplexing (OFDM) systems, such performance degradation arises as a result of intercarrier interference (ICI). We have shown previously that,...
Time-based localization by terrestrial cellular mobile radio as a complement to global navigation satellite systems has gained significant attention. However, under non-line-of-sight (NLoS) conditions, the performance of positioning receivers is degraded by an additional bias. This NLoS bias is defined as the additional propagation distance between the first detectable path and the geometric line...
This paper proposes a differential codebook-based method to reduce the feedback overhead for closed-loop MIMO-OFDM systems. With the assumed multimode transmit precoding, both the number of data streams (rank) and the index of precoding matrix are fed back to the transmitter at each sub-band. By exploiting the channel correlation in frequency domain, an enhanced differential codebook (a subset of...
In radio navigation system working on medium-short wave band, serious multipath interference and atmosphere noise make the precision of code tracking loop decrease. In order to improve the positioning precision, carrier phase measurement is generally adopted, but carrier ambiguity resolution is a key problem. Based on the analysis of multipath error of code tracking loop, a carrier ambiguity resolution...
Time Based (TB) localization by terrestrial cellular communications mobile radio as a complementation to Global Navigation Satellite Systems (GNSSs) has gained plenty of interests. Apart from multipath considered in standard communication channel models, the Non Line-of-Sight (NLoS) error due to an undetectable Line-of-Sight (LoS) path, defined as the additional propagation distance between the first...
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