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.
Error-rate evaluation of space-time codes using union bounds sometimes requires very heavy computational loads and so is impractical to use. In this paper, a common function shared by different union bounds is derived and used to develop a modified union bound (MUB) for error-rate evaluation. Results of numerical evaluations and Monte-Carlo simulation on two 2times2 rotation-based S-T codes show that...
The formula for the exact union bound (EUB) on BER based on the exact closed-form pair-wise error probability (PEP) is most accurate for calculating the bit-error-rates (BERs) of space-time (S-T) codes in multiple-input multiple output (MIMO) systems. In this paper, it is shown that using the exact closed-form PEP formula for numerical calculations of the PEP or the EUB on BER could produce negative...
A close-form expression of the exact pair-wise error probability (PEP) for space-time (S-T) codes in Rayleigh fading channel is derived using the probability-density function (PDF) of a sum of independent exponential distributed random variables. Since the expression requires evaluating the coefficients for partial fraction expansion, an easy analytical way is proposed for doing this. The exact PEP...
The exact pair-wise error probabilities (PEP) formulas developed for space-time (S-T) coding so far either are not in the closed forms or have the closed forms but need to calculate very complicated high order derivatives, and so are not easy to use. This paper derives, for S-T coding in block Rayleigh fading, a new exact PEP formula which is expressed as the summation of a series of terms to the...
In this paper, we analyze the decode-and-forward cooperative multihop transmission. Different from conventional multihop transmission, each node achieves the spatial diversity by combining all the independently fading symbols from previous nodes on the route line. We consider the possibility for the relay node to forward error-detected symbols, and propose an adaptive transmission protocol to compensate...
n this paper, an exact closed-form formula for the pair-wise error probability (PEP) is derived for two transmit and two receive antennas MIMO systems using the probability density function (PDF) of the modified Euclidean distance. An exact union bound formed by this formula, together with the asymptotic union bound, are studied for optimization and bit-error rate (BER) evaluation of space-time (S-T)...
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.