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In this paper we propose a frequency domain equalization scheme for the cyclic prefix assisted (CPA) cyclic code shift keying (CCSK) system. In particular, the proposed scheme performs both correlation and decision in the frequency domain, which helps to reduce the computational complexity. Simulation results show that the proposed system achieves the best bit error rate (BER) performance with the...
In this paper, we demonstrate a novel architecture of variable weight Zero Cross Correlation code in the family of Spectral Amplitude Coding(SAC) Optical Code Division Multiple Access (OCDMA) to be utilized in the triple play services of OCDMA applications based on the end users demand and requirements. This is achieved by adapting multiple weights of Zero Cross Correlation (ZCC) code onto one system...
In this paper, we investigate the impact of antenna spatial correlation on the performance of K-user MIMO interference channel, in which interference alignment technique is employed to align all interferences at receivers. In order to improve the sum-rate and BER performances of the system in low SNR regimes the MMSE-based interference alignment algorithm is deployed. This paper considers a multiuser...
Optical Code Division Multiple Access (OCDMA) system are limited by the interference between users as well code length due to the code developments. A detailed of code construction for a OCDMA system with flexible cross correlation is presented to reduce the effect of interference thus optimizing the code length. In this paper, the proposed code called Flexible Cross Correlation (FCC) code. The FCC...
Abstract-This paper considers the uplink receiver algorithm of femtocell, when it suffers from the interference caused by the user in the nearby macrocell. As femtocells share the same frequency band with macrocells, signal of the user in the macrocell might also be received by the femtocell receiver, which becomes interference. This paper proposes a scheme of combining the algorithm of MMSE Successive...
This paper presented a code with non-zero in-phase cross- correlation Spectral Amplitude Coding Optical Code Division Multiple Access (OCDMA) system. The proposed code called Modified Non Zero Cross Correlation (MNZCC) code. The MNZCC code can be constructed easily for any given number of users, weights and cross correlation (λmax) using tridiagonal matrix properties. MNZCC code will be demonstrated...
This paper presented a new class of code called Modified Non-Zero Cross Correlation (MNZCC) Code for Spectral-Amplitude Coding Optical Code Division Multiple Access. The MNZCC code can be constructed easily for any given number of users, weights and cross correlation (λmax) with tridiagonal matrix properties. We find that the performance of MNZCC code is better than OCDMA codes such as MDW and MFH...
In this paper we jointly consider statistical precoding and statistical bit allocation for transmission over correlated MIMO (multiple-input and multiple-output) channels with a linear and zero forcing receiver. Assuming the statistics of the channel is available to the transmitter, we will derive BER bounds using the statistics of subchannel error variances. The bounds are then used to design statistical...
The key of the multimedia compression technique is trying to remove the correlation between the neighboring frames. Due to the computational complexity limitation, considerable correlation is still observed in the multimedia-coded sequence. This residual redundancy can be modeled as a first-order Markov model with the transition probability of the multimedia-coded parameter between adjacent frames...
In this paper, a compressive sampling (CS) based multiple symbol differential detector is proposed, using the principle of a generalized likelihood ratio test (GLRT). The proposed detector works on the compressed samples directly, thereby avoiding the reconstruction step and thus resulting in a reduced implementation complexity along with a reduced sampling rate (much below the Nyquist rate). We also...
Frequency selective fading that is caused by the multipath becomes a problem in broad band communication like a UWB (Ultra Wideband) system. This paper discusses the RAKE reception technique by using the multicarrier template waveform in the UWB-IR (Impulse Radio) system to compensate the influence of multipath. The template waveform in the UWB receiver is modified to the multicarrier pulse, because...
In this paper, we consider Single Input Multiple Output (SIMO) systems with Maximum Ratio Combining(MRC) and Equal Gain Combining (EGC). We assume spatially independent and timely correlated Rayleigh flat fading channels, modeled by AR2 processes. We consider a frame of N+2 symbols, where Channel State Information at Receiver (CSIR) is available in the beginning for two consecutive symbols, also called...
A novel variable step size constant modulus algorithm (VSS-CMA) employing cross correlation between channel output and error signal has been proposed as a solution to the problem of slow convergence of CMA algorithm. The new algorithm resolves the conflict between the convergence rate and low steady state error of the fixed step-size conventional CMA algorithm. Computer simulations have been performed...
The performance of multiple-aperture freespace optical communication systems is studied under the conditions of correlated fading, considering the Gamma-Gamma (ΓΓ) model for the intensity fluctuations. Waveoptics numerical simulations based on the random phase screen method are used to simulate beam propagation through the turbulent atmosphere and to calculate the fading correlation coefficient between...
The closed-form simple expressions for bit error rate (BER) in multiple input - multiple output (MIMO) systems operating under flat and quasi-static Rayleigh fading have been derived. This method is based on the positional statistics. Next, the expressions were extended to dynamic and cross-correlated channels.
A novel simplified channel estimation scheme for Chinese Multiple Input Single Output (MISO) Digital Terrestrial Multimedia Broadcasting (DTMB) system is proposed. With the consideration of the back compatibility with Chinese Single Input Single Output (SISO) DTMB standard, the adopted frame structure is carefully designed over multiple antennas. The modified time domain correlation channel estimation...
It has been shown that due to its smaller signal bandwidth (96 KHz), DRM+ signal could suffer from flat fading degradation at low receiver speeds, particularly in urban environments. To alleviate this problem, a simple transmit delay diversity (TDD) has been proposed in the standard. This paper tries to investigate this issue by presenting the performance results of multipath fading characterizations...
The NAND Flash memory is the most scaled device nowadays and it is the best candidate to keep pace with the Moore's Law. However, highly scaled memory dimensions decrease to the point where variability effects become the dominating showstoppers. Especially, the Line Edge Roughness (LER) is the dominating key parameter for NAND Flash memory electrical performance, the outcome of novel Lithography processes...
This paper presented the novel of a new class of code with Non-Zero Cross-Correlation for Spectral-Amplitude Coding in Optical Code Division Multiple Access (OCDMA) systems. A new code namely Modified Non-Zero Cross Correlation Code (MNZCC). MNZCC code can be constructed easily for a given number of users K, weights and for a given cross correlation (λmax). The proposed code was demonstrated in simulation...
In iterative IDMA scheme, the users are distinguished with various chip-level interleaving sequences instead of user-specific signature sequences as in conventional code-division multiple-access (CDMA) scheme. A set of interleavers is considered to be practical if it has zero correlation with each other and also easy to generate as well requires minimal bandwidth during communication process. A properly...
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