In this paper, the average probability of the symbol error rate (SER) and throughput are studied in the presence of joint spectrum sensing and data transmission in a cognitive relay network, which is in the environment of an optimal power allocation strategy. In this investigation, the main component in calculating the secondary throughput is the inclusion of the spatial false alarms, in additi...

Design of Space-Time Block codes (STBCs) for Maximum Likelihood (ML) reception has been predominantly the main focus of researchers. However the ML decoding complexity of STBCs become prohibitive large as the number of transmit and receive antennas increase. To solve this problem, orthogonal designs, single symbol ML decodable and double symbol ML decodable STBCs have been proposed in the liter...

—This paper investigates the performance, analysis of amplify and forward (AF) cooperative networks with the best relay selection in independent and non-identical Nakagami-m channels and M-ary phase shift keying (MPSK) modulations. New closed form expressions are derived of the analytical upper bound, cumulative density function (CDF), probability density function (PDF), moment generating func...

In this paper we present and analyze a method for channel SNR (Signal to Noise Ratio) estimation for M-PSK, which is based upon the exploitation of the statistics of a symbol synchronization lock metric. The analysis pertains to AWGN (Additive White Gaussian Noise) channels in systems whose baseband pulse shape is Square-Root Raised Cosine (SRRC) or rectangular. It is shown that, in terms of la...

In code division multiple access (CDMA), two or more chips are grouped together to form symbols and each symbol is transmitted during the symbol period. The phase shift keying (PSK) modulation techniques map the digital baseband data into two or more possible signals by varying the phase of a radio frequency (RF) carrier. The recently proposed PSK scheme called ternary PSK (TPSK) scheme can con...

An importance sampling simulation technique is used to estimate the bit-error rate (BER) of a symbol-by-symbol trelliscoded modulation (TCM) decoder/equalizer proposed for digital microwave radio applications. To evaluate the performance at a BER smaller than 10 , we investigate a randomized bias technique previously developed by the authors. To properly select the bias vectors, the asymptotic ...

Multiple-input multiple-output (MIMO) antenna systems employ spatial multiplexing to increase spectral efficiency or transmit diversity to improve link reliability. The performance of these signaling strategies is highly dependent on MIMO channel characteristics, which, in turn, depend on antenna height and spacing and richness of scattering. In practice, large antenna spacings are often requir...

Minimum distance (MD), maximum likelihood (ML), and maximum a posteriori (MAP) decoding is considered for synchronization error correcting (SEC) codes with known codeword boundaries when transmitted over the Binary Substitution, Insertion and Deletion channel. It is shown that MD decoding is sub-optimal, unlike ML or MAP decoding. Based on ML and MAP decoding, a new measure called the Change Pr...

Recently, we provided closed-form expressions involving two-dimensional (2-D) joint Gaussian Q-function for the symbol error rate (SER) and bit error rate (BER) of an arbitrary 2-D signal with I/Q unbalances over an additive white Gaussian noise (AWGN) channel [1]. In this paper, we extend the expressions to Nakagami-m fading channels. Using Craig’s representation of the 2-D Gaussian Q-function...

data transmission which requires robust and spectrally efficient communication techniques. The basic idea behind adaptive transmission is to improve spectral efficiency by varying the transmission power level, symbol transmission rate, constellation size, and coding rate scheme. In this paper adaptive modulation and turbo coding is applied to OFDM that can provide a lower bit error rate than ad...