The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
This letter studies the symbol error probability (SEP) of quadrature-amplitude modulation (QAM) signals constructed from the hexagonal lattice, known as hexagonal QAM or triangular QAM. In particular, we propose a simple and accurate approximation for the SEP of hexagonal QAM in additive white Gaussian noise. Simulation results show that the proposed approximation is very accurate for all the best-known...
This paper evaluates the bit-error rate and spectral efficiency performance provided by the convolutional coded Quadrature Amplitude Modulation (QAM) configurations whose global rates are modified mainly by changing the numbers of code and non-coded bits mapped on a QAM symbol. The Bit Error Rate (BER) performance provided are compared to the ones of the convolutional coded modulations which map only...
This paper presents simple closed-form expressions to compute symbol error probability of a novel Triangular Quadrature Amplitude Modulation using different diversity reception schemes over Rayleigh fading channel. In this article, mathematical model for average energy, energy per dimension, bits per dimension, minimum distance and constellation figure of merit along with symbol error probability...
In this paper, we derive the averaged bit and symbol error probabilities as approximated closed-forms for M-ary quadrature amplitude modulation (MQAM) burst transmission of adaptive decode-and-forward (ADF) relay systems over quasi-static Rayleigh fading channels. Within a burst, there are pilot symbols and data symbols. Pilot symbols are used for channel estimation schemes and each relay node's transmission...
As the M-ary signaling scheme is mapping of N bits information to M signal elements, M has to be generally represented as 2 to Nth power (2N), which results in degrading the degree of freedom of a system design. In this paper, we introduce an encoding method of the M-ary signal with an arbitrary rational number by grouping two different M-ary signals. It enables us to choose M freely to satisfy a...
Fading is a significant part of any wireless communication system. Rayleigh, Rice and Nakagami-m are traditional fading channels but in some specific cases these fading distributions do not properly fit the experimental measured data, which demands the use of more general fading distributions. The Kappa-Mu distribution is general distribution that includes the Rice, the Nakagami-m, the Rayleigh, and...
The amplified spontaneous emission (ASE) noise of optical amplifiers and nonlinear phase (NLP) noise generated due to interaction of ASE noise and Kerr nonlinearity are the two main sources of noise in optical fiber communications systems. This paper presents an analysis of the effects of ASE noise and NLP noise on the symbol error rate performance of M-ary quadrature amplitude modulated (QAM) signals...
This paper considers the average symbol error probability of square Quadrature Amplitude Modulation (QAM) coherent signaling over flat fading channels subject to additive generalized Gaussian noise. More specifically, a generic closed-form expression in terms of the Fox H function and the bivariate Fox H function is offered for the extended generalized-K fading case. Simplifications for some special...
This article investigates the efficacy of a constant-power, rate-adaptive M-QAM transmission technique in amplify-and-forward cooperative wireless networks. Tight upper and lower bounds are derived for the mean achievable spectral efficiency, outage probability, and error probability performance of non-regenerative cooperative relay networks in Nakagami-m fading environments. We observe that the spectral...
In the context of two-wave with diffuse power (TWDP) fading scenarios, this letter analyzes the average symbol error probability (SEP) of rectangular quadrature amplitude modulation (QAM) for single- and multi-channel receptions. Specifically, novel exact expressions are derived for the average SEP in nondiversity and maximal-ratio combining (MRC) schemes. Our derived SEP results apply to general...
In this paper, two decoders with low decoding complexity for a MIMO system with finite bit feedback channel are proposed. Theoretical analysis on performance and simulations show that the loses of performance comparing to the ML-decoder are acceptable.
We consider an amplify-and-forward half-duplex co-operative wireless system. Specifically, we examine the role of the relay and design an optimum amplification factor for the relay. In the simple case of the message lasting for two symbols, and from the consideration of transmitting from a 4-QAM constellation, we develop an explicit expression of the pair-wise error probability. An optimum design...
In this paper we investigate the end-to-end performance of dual-hop fixed gain relaying systems under asymmetric fading conditions. In such conditions, the links associated with the relay network undergo different fading phenomena. In our analysis, the source-relay and the relay-destination links are subject to fading-only or composite multi-path/shadowing environments. An outage analysis of the considered...
In this paper, we assess the random coding error exponents (EEs) corresponding to decode-and-forward (DF), compress-and-forward (CF) and quantize-and-forward (QF) relaying strategies for a parallel relay network (PRN), consisting of a single source and two relays. Moreover, through numerical analysis we show that the EEs achieved by using QF relaying along with non-Gaussian signaling (coded modulation,...
An exact form of symbol error rate (SER) is derived for zero-forcing decision feedback equalization (ZF-DFE) on fast fading channels. We present an error propagation framework in ZF-DFE, which is dependent on the length of multipath and the size of M-ary quadrature amplitude modulation (M-QAM). By applying the concepts of “error event” and “state” on this framework, we can evaluate the error probability...
A symbol-by-symbol phase noise estimation algorithm for polarization-multiplexed 16-QAM is evaluated. We found that it can cope with laser linewidths of up to 2.2 MHz in high SNR regimes, at 112 Gbit/s.
In this paper, the robust QAM classification method against phase offsets has been proposed. In the proposed method, the amplitude and the square cosine moments are used for the classification. The classification error probability has been examined for 16QAM and 64QAM. Simulation results have shown that the proposed method gives the superior classification performance to the amplitude moments method.
This paper uses a simple closed-form technique for the computation of the symbol error rate or bit error rate for the performance of coherent M-ary digital modulation schemes over Nakagami-m fading, Rician fading and perturbed by additive white gaussian noise . The expressions for the symbol error probability or bit error probability are simple and include Gauss hypergeometric functions which can...
In this paper, the optimal threshold for the erasure-marking technique suitable for RS-coded quadrature amplitude modulation (QAM) schemes using error-and-erasure decoding (EED) over i.i.d. fading channels is determined for the system. The performance and capacity of the RS-coded QAM system using EED with the obtained optimal erasure thresholds, and error-only decoding (ED) over i.i.d. Rayleigh and...
In this paper, we investigate the average symbol error probability (SEP) of fixed decode-and-forward relay networks over independent but not identically distributed Nakagami-m fading channels. We have derived closed form expression of SEP for general rectangular quadrature amplitude modulation (QAM) under relay selection scheme where only the best relay forwards message from the source to the destination...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.