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To calculate the unconditional bit error probability directly, the Signal to Interference-plus-Noise Ratio (SINR) distribution of a communications system must be known. However, for precoded systems employing Minimum Mean Square Error (MMSE) equalization, a suitable distribution has not been found yet. In this paper, we propose, as an approximation for the SINR of a precoded multicarrier system employing...
In this paper, an efficient Decode-and-Forward (DF) relay selection scheme for interference-limited relaying networks is considered. In contrast to previously reported works, we consider multiple interferences which make the conventional relay selection schemes not suitable for interference-limited networks and propose a new relay selection scheme for DF protocol with multiple interferences. Approximate...
Self-cancellation schemes have received a lot of attention due to their simple implementation and high efficiency to suppress intercarrier interference (ICI) in Orthogonal Frequency Division Multiplexing (OFDM) systems. Among those ICI self-cancellation methods, Symmetric Conjugate Symbol Repetition (SCSR) has been proven to have the best bit error ratio (BER) performance for phase noise suppression...
An approximation for the average error probability (AEP) of the pulse amplitude modulation (PAM) impulse radio ultra wide band (IR-UWB) systems in the presence of multi-user interference (MUI) is derived assuming that the spreading codes are fixed in time. The comparison of the proposed theoretical expression and the empirical result shows the accuracy of our approximation for both direct-sequence...
In this paper, an energy efficient adaptive modulation scheme is proposed for a wireless cognitive radio ad hoc network, where each node is equipped with cognitive radio and the network is an OFDMA system operating on time slots. In each slot, the users with new traffic demand will sense the spectrum and locate the available subcarrier set. Then they choose subcarriers with favorable channel condition...
The multi-access scheme of 802.11 wireless networks imposes difficulties in achieving predictable service quality in multi-hop networks. In such networks, the residual capacity of wireless links should be estimated for resource allocation services such as flow admission control. In this paper, we propose an accurate and non-intrusive method to estimate the residual bandwidth of an 802.11 link. Inputs...
While two-dimensional (2-D) orthogonal variable spreading factor (OVSF) codes were proposed for multicarrier direct-sequence code-division multiple-access (MC/DS-CDMA) systems in order to eliminate multiple-access interference, the number of orthogonal sequences (or code cardinality) was restricted by the number of carrier frequencies. Non-orthogonal 2-D frequency-time-spreading (FTS) codes were then...
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