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The linear minimum mean square error (LMMSE) estimation of frequency selective fading channels is addressed in two-way relay networks. We estimate the channel responses required for self-interference cancelation and coherent detection in the time domain. The optimal training condition for the minimization of the mean square error (MSE) of the LMMSE estimator is derived and, taking into account the...
In this paper, we theoretically analyse the influence by intersymbol interference (ISI) on the bit error rate (BER) performance of the spread spectrum (SS) system using a real-valued Huffman sequence whose aperiodic correlation function has zero sidelobes except at the left and right shift-ends, under the quasi-static Rayleigh fading environment. The system can give the unified communication and ranging...
The present paper introduces a novel method for the construction of sequences that have a zero-correlation zone. For the proposed sequence set, both the cross-correlation function and the side lobe of the auto-correlation function are zero for phase shifts within the zero-correlation zone. The proposed sequence set can be generated from an arbitrary Hadamard matrix of order n and a set of 2n trigonometric-like...
In multiple-input multiple-output orthogonal frequency division multiplexing (MIMO/OFDM) systems, large complexity is considerable work. To mitigate this problem, high time resolution carrier interferometry (HTRCI) for MIMO/OFDM applying QR decomposition with M algorithm maximum likelihood detection (QRM-MLD) and channel ranking has been proposed. In the fast fading environment, since many errors...
The high speed railway wireless communication system is much different from public wireless communication system, because the service is train control messages, which is closely related to the safety of train transportation. Thus it is much demanding to the security and reliability. To guarantee the train control messages delivery security, secrecy capacity and outage probability at the high speed...
This paper proposes an advanced distributed resource allocation scheme for device-to-device (D2D) communication using loose network-assistance, namely distributed interference channel based resource allocation (DICRA). The MAC/PHY protocol of the proposed DICRA is described and the performance advantage over FlashLinQ is confirmed from computer simulation results.
Presents the front cover or splash screen of the Sixth International Workshop on Signal Design and Its Applications in Communications proceedings record.
In this paper, we investigate the synchronization for OFDMA-based wireless mesh networks and analyze the effect of carrier frequency misalignment between distributed nodes. Based on our previous work, so called, Distributed Frequency Synchronization (DFS), we propose a modified DFS (mDFS). The proposed scheme incorporates some practical issues, not considered in the previous DFS scheme. Simulation...
In order to evaluate the goodness of frequency hopping (FH) sequence design, the periodic Hamming correlation function is used as an important measure. Usually, the length of correlation window is shorter than the period of the chosen FH sequence, so the study of the partial Hamming correlation of FH sequence is particularly important. In this paper, we first prove that there does not exist a strictly...
Integer-forcing (IF) linear receiver has been recently introduced for multiple-input multiple-output (MIMO) fading channels. The integer coefficients have to be chosen based on the channel realizations, and the choice of such coefficients is known to determine the receiver performance. It has been proved that Integer-forcing receiver outperforms the minimum mean square estimator (MMSE) and zero-forcing...
Two classes of optimum frequency hopping sequences (FHSs) derived from Fermat quotient with respect to the Lempel-Greenberger bound are presented. The constructed p2-periodic sequences are defined over ℤp and have the maximum Hamming autocorrelation p, where p is a prime. Also, we give a new optimum family of sequences with size p. Moreover, we interpret the constructed sequences in terms of new partition...
The reliability of wireless communication systems in high-speed railway, especially the reliable transmission of train control information, has attracted a lot of attention. With the decision of global system for mobile communication for railway (GSM-R) evolution to long-term evolution (LTE) for railway by International Union of Railways (ITU), many techniques such as redundant transmission and low...
A spread spectrum technology is known to be able to expand the distance of wireless communications by improving the processing gain. However, the effective processing gain is decreased due to the phase shift between the two transceivers. We have studied the compensation algorithm of this phase shift, and its performance has been evaluated by a computer simulation. This paper shows some experimental...
In this paper, we described the properties of the modified pseudo-ternary M-sequence (MPTM) pair, which consists of the MPTM and {−1, 1}-valued M-sequence, such as the generating MPTM pair, the orthogonality, the expansion of MPTM, the cross-correlation, and the S-curve characteristic. MPTM is a PN code which combines the {0, 1}-valued M-sequence with the Hadamard code. The S-curve characteristic...
A pseudo-noise (PN) code used by code shift keying (CSK) for optical wireless communication with intensity-modulation and direct detection (IM/DD) are considered. Since CSK has the several PN codes, the data transmission rate and the bit error rate (BER) performance can improve by increasing the number of PN codes. However, the conventional optical PN codes are not suitable for optical CSK with IM/DD...
Golay sequences have been studied for more than five decades since Golay first discovered those sequences, which have found many applications in communications, especially, for peak average power ratio reduction in orthogonal frequency division multiple (OFDM) systems in recent cellular communication. However, the periodic auto- correlation of a single Golay sequence is unknown. In this talk, I will...
In multi-code transmission system, the amplitude of the transmission signal may have sharp fluctuations, and non-linear distortion occurs in the transmission signal. To solve this problem, the authors propose two novel multi-code transmission systems with constant amplitude signaling in this paper. They compare the proposed systems with Multi-Code transmission with Constant Amplitude signaling (MC-CA)...
In this paper, we present a class of punctured codes from maximum distance separable (MDS) codes given by Ezerman, Grassl, and Solé in 2011. Choosing the left shift distinct sequences from every full-cycle equivalence class, we obtain a class of FH sequence sets, the parameters of which meet the Singleton bound on the maximum Hamming correlation of FH sequences.
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