... a different offset. A typical TH-CDMA/PPM signal takes the form sk (t) = √ Eb Ns Ns−1 ∑ j=0 p... more ... a different offset. A typical TH-CDMA/PPM signal takes the form sk (t) = √ Eb Ns Ns−1 ∑ j=0 p (t − jTf − c (k) j Tc − a (k) i δ) , (i − 1) Tb < t ≤ iTb (1) where the quantities ... r (t) = K ∑ k=0 sk (t − τk) + n (t) (2) where n (t) is the AWGN ...
In this paper, we investigate the performance trade-offs of cooperative-relaying at the packet le... more In this paper, we investigate the performance trade-offs of cooperative-relaying at the packet level and provide insight into the characteristics of this technique with regards to its prospective applications. The investigation is carried out through simulations and verified by a real cooperative-relaying network (CRN) testbed. Different propagation environments with the non-zero Doppler shift and multipath effect are also considered in
2009 International Conference on Wireless Communications & Signal Processing, 2009
A new scheduling algorithm with low complexity for user selection is proposed for a multiuser mul... more A new scheduling algorithm with low complexity for user selection is proposed for a multiuser multiple-input and multiple-output (MU-MIMO) downlink system based on block diagonalization (BD) precoding. The new algorithm provides equivalent system performance evaluated as sum-rate capacity in comparison with other user selection algorithms, such as semiorthogonal user selection (SUS) and capacity-based user selection algorithms. The proposed algorithm has
We have analysed the performance and stability of a random access CDMA packet network in the pres... more We have analysed the performance and stability of a random access CDMA packet network in the presence of MAI. The standard Gaussian approximation overestimates the BER, particularly for a small number of users. The overestimation or underestimation also exhibits in the analysis of the packet success probability, throughput, delay and stability. The effect of the MAI on the network performance is evaluated using the improved Gaussian approximation that takes into account bit-to-bit error dependence. It has been shown that the simple BER calculation method used in the paper is sufficiently complex. This also reduces the difficulty for the subsequent analysis including throughput, delay and stability that depend on BER performance
Proceedings of the 6th ACM symposium on Performance evaluation of wireless ad hoc, sensor, and ubiquitous networks, 2009
In this paper, we investigate the performance trade-offs of cooperative-relaying at the packet le... more In this paper, we investigate the performance trade-offs of cooperative-relaying at the packet level and provide insight into the characteristics of this technique with regards to its prospective applications. The investigation is carried out through simulations and verified by a real cooperative-relaying network (CRN) testbed. Different propagation environments with the non-zero Doppler shift and multipath effect are also considered in
... a different offset. A typical TH-CDMA/PPM signal takes the form sk (t) = √ Eb Ns Ns−1 ∑ j=0 p... more ... a different offset. A typical TH-CDMA/PPM signal takes the form sk (t) = √ Eb Ns Ns−1 ∑ j=0 p (t − jTf − c (k) j Tc − a (k) i δ) , (i − 1) Tb < t ≤ iTb (1) where the quantities ... r (t) = K ∑ k=0 sk (t − τk) + n (t) (2) where n (t) is the AWGN ...
In this paper, we investigate the performance trade-offs of cooperative-relaying at the packet le... more In this paper, we investigate the performance trade-offs of cooperative-relaying at the packet level and provide insight into the characteristics of this technique with regards to its prospective applications. The investigation is carried out through simulations and verified by a real cooperative-relaying network (CRN) testbed. Different propagation environments with the non-zero Doppler shift and multipath effect are also considered in
2009 International Conference on Wireless Communications & Signal Processing, 2009
A new scheduling algorithm with low complexity for user selection is proposed for a multiuser mul... more A new scheduling algorithm with low complexity for user selection is proposed for a multiuser multiple-input and multiple-output (MU-MIMO) downlink system based on block diagonalization (BD) precoding. The new algorithm provides equivalent system performance evaluated as sum-rate capacity in comparison with other user selection algorithms, such as semiorthogonal user selection (SUS) and capacity-based user selection algorithms. The proposed algorithm has
We have analysed the performance and stability of a random access CDMA packet network in the pres... more We have analysed the performance and stability of a random access CDMA packet network in the presence of MAI. The standard Gaussian approximation overestimates the BER, particularly for a small number of users. The overestimation or underestimation also exhibits in the analysis of the packet success probability, throughput, delay and stability. The effect of the MAI on the network performance is evaluated using the improved Gaussian approximation that takes into account bit-to-bit error dependence. It has been shown that the simple BER calculation method used in the paper is sufficiently complex. This also reduces the difficulty for the subsequent analysis including throughput, delay and stability that depend on BER performance
Proceedings of the 6th ACM symposium on Performance evaluation of wireless ad hoc, sensor, and ubiquitous networks, 2009
In this paper, we investigate the performance trade-offs of cooperative-relaying at the packet le... more In this paper, we investigate the performance trade-offs of cooperative-relaying at the packet level and provide insight into the characteristics of this technique with regards to its prospective applications. The investigation is carried out through simulations and verified by a real cooperative-relaying network (CRN) testbed. Different propagation environments with the non-zero Doppler shift and multipath effect are also considered in
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