Symbol error rate

Phase noise (PN) impact in communication systems is considered as great, especially in wireless communication systems using higher m-QAM modulation schemes. The objective of this evaluation study is to investigate the exact impact of Phase noise in relation to AWGN, within a wide range of QAM schemes, since an implementation, of higher QAM usage, is anticipated to be widely used in modern wireless communication industry.

This work focuses on presenting a novel high efficiency channel encoding for transmitting acoustical signals in the hope of improving wireless underwater communication. Yet, water puts a damper on communication capacity, slowing down the signal propagation and creating background noise and echoes. For thus systems and methods for implementing a control channel, e.g., in underwater communication system, are presented below. Aspects of the channel structures used to implement the control channel described herein, can improve error detection capabilities, reduce decoding complexity, and increase transmission efficiency. In certain aspects, transmission efficiency can be increased through using CRC encoding. A circular trellis check and Viterbi decoding can also be used to increase efficiency and maintain error detection capabilities. Symbol Error Rate (SER) can be reduced in embodiments described herein over that of tail-biting convolutional coding with a CRC. Furthermore, error detection offered by Reed Solomon encoder can well compensate underwater noise. Additionally, the encoder packet size can be fixed in order to facilitate decoding and reducing receiver complexity.

The exact performance of selection combining, hybrid selection/maximal-ratio combining (H-S/MRC), and threshold-based H-S/MRC in correlated Nakagami-m fading for positive integer values of fading parameter m, is analyzed for a particular correlation structure. This correlation model, though not general, is much more general than the equal-correlation case, and includes equal correlation as a special case. The symbol-error rate and outage probability of the three combining schemes are obtained by transforming the correlated branch gains into a set of conditionally independent branch gains. Numerical and simulation results show excellent agreement with theoretical results

Abstract-This paper presents simple bit error rate results for M-ary Quadrature Amplitude Modulation (M-QAM) transmitted over slow, flat, identically independently distributed (iid) Nakagami and Rician fading channels and using space-time transmit diversity (STTD) to enhance ...

This paper considers the influence of a deterministic phase error for coherent M-QAM demodulators in a non-Gaussian environment; the latter is modeled as a combination of a white Gaussian process and a filtered Poisson process whose enveloped amplitude obeys the Rayleigh distribution. General results show that when approaching the critical limit, the symbol error rate quickly reaches a plateau having a relatively large width

This paper analyzes MIMO systems with multichannel beamforming in Ricean fading. Our results apply to a wide class of multichannel systems which transmit on the eigenmodes of the MIMO channel. We first present new closed-form expressions for the marginal ordered eigenvalue distributions of complex noncentral Wishart matrices. These are used to characterize the statistics of the signal to noise ratio (SNR) on each eigenmode. Based on this, we present exact symbol error rate (SER) expressions. We also derive closed-form expressions for the diversity order, array gain, and outage probability. We show that the global SER performance is dominated by the subchannel corresponding to the minimum channel singular value. We also show that, at low outage levels, the outage probability varies inversely with the Ricean A*-factor for cases where transmission is only on the most dominant subchannel (i.e. a singlechannel beamforming system). Numerical results are presented to validate the theoretical analysis.

In this paper, we consider the error performance of the regular triangular quadrature amplitude modulation (TQAM). In particular, using an accurate exponential bound of the complementary error function, we derive a simple approximation for the average symbol error rate (SER) of TQAM over Additive White Gaussian Noise (AWGN) and fading channels. The accuracy of our approach is verified by some

This paper investigates the performance of spacedivision multiple access (SDMA) schemes in cognitive radio systems (CR) with multiple primary users (PUs) and secondary users (SUs) sharing the same spectrum. By adding more constraints to the conventional SDMA schemes and using the optimization of the Lagrange multipliers we developed an iterative weights calculating method to determine the new cognitive beamforming (BF) vectors for the secondary network. The beamformer is designed to maximize the signal-to-interference plus noise ratio (SINR) at the secondary base station, defined as the ratio of the desired cognitive signal power to the total interference power from all other secondary and primary users, while controlling the interference levels to the PUs. Using simulation, the performance of the conventional SDMA schemes is compared to the constrained one. It is noted that at low SNR the symbol error rate (SER) and the system capacity obtained for the CR system are very close to t...

— Underwater communication is one of the unique and challenging fields in communication engineering in the case of both designing and communication. Previous papers explained about different views in acoustic based underwater communication. Communication with acoustic waves is suitable type of wireless transmission with sound waves underwater. This paper explains about SER and MSE analysis of AF relay based cooperative underwater communication based on CGM-MP-SAGE algorithm. Here in this paper it summarizes estimation and equalization with SAGE algorithm of acoustic waves through underwater. This is a review paper to analyze the error rate performance and reliability of UWAC with respect to the SNR for different signal parameters, mainly MP, perfect CSI and MP SAGE algorithms, Doppler rates, resolution factors, multipath with variable lengths and pilot spacing based on BPSK modulated OFDM signals.

In this paper, we consider two-way amplify-and-forward relaying communication over a multiple relays network in which the best relay node is selected among others. Our proposed scheme picks for duplex communication between the source and the destination only the relay which provides the best end-to-end performance based on the instantaneous channel information. Similar to the relay selection method proposed, our scheme also does not require any explicit communications among the relays. Based on the proposed relay selection criterion, we offer the performance bounds on the average sum-rate, average symbol error rate, outage probability over identically, independent distributed Rayleigh fading channels. Further, our numerical examples show that our proposed scheme provides considerable sum-rate gains and offers an increasing a diversity order as the number of relay candidates increases.