In this Paper the exact expressions for the Symbol Error Probability (SEP) of Hybrid Selection/Maximal Ratio Combining wireless systems for M-ary QAM are derived and analyzed in multipath fading environment. Independent Rayleigh fading diversity branch is assumed for analysis with equal Signal-to-Noise Ratio averaged over the fading channels and coherent detection of M-ary Quadrature amplitude ...

 A nonlinear transmitter-based multiple access interference (MAI) cancellation technique, Tomlinson-Harashima transmitter precoding (THP), is proposed for Direct Sequence (DS) Code-Division Multiple Access (CDMA) systems with or without multipath fading. This zero forcing (ZF)-based transmitter precoding method minimizes the mean square error at the receiver. It is suitable for the downlink si...

In wireless communication systems MIMO systems are implemented to reduce the effects of multipath fading. Various fadings like Rayleigh fading, racian fading occurs in atmosphere. These fadings effect the performance of communication channel and to reduce fading various techniques are developed, one of them is diversity technique. Various diversity techniques are used to remove effects of fadin...

Vehicular Ad hoc network (VANET) has recently been attracting the attention of researchers as a new technology in the wireless communication system. Vehicle-to-vehicle V2V communication can be considered an important way to help the drivers to satisfy requirements such as less congestion, accident warning, road exploration, etc. The propagation issues such as multipath fading significantly affe...

In the present scenario, there is a rising demand of high capacity, high performance and low Bit Error Rate (BER) in Wireless Communication systems. The Orthogonal Frequency Division Multiplexing (OFDM) is an attractive multi carrier modulation technique for wireless transmission systems. In this paper, we discuss the effect of Doppler frequency in Fast Fourier Transform (FFT) based OFDM system...

Orthogonal frequency division multiplexing (OFDM) is a special case of multicarrier transmission and frequency division multiplexing, where a single data stream is transmitted over several lower rate subcarriers, placed orthogonal to each other. Today it is becoming the chosen modulation technique for wireless communications. It can provide large data rates with optimum bit error rate and enoug...

In the forward link of WCDMA systems, the multipath propagation channel destroys the orthogonality of the spreading codes and therefore causes multi-user interference (MUI). In this paper, we propose new training-based and semi-blind space-time chip equalizer receivers for the forward link of WCDMA systems with a continuous code-multiplexed pilot. Both Least-Squares (LS) algorithms for block pr...

To localize mobile devices in the indoor environment, it is considered as a natural approach to make use of a commodity device. One popular work utilizes the physical layer information of WLAN devices. The information includes a beneficial characteristic, that is, the possibility of eliminating some degree of multipath fading effects. This paper deals with some experiments to improve the indoor...

In this paper we investigates time delay and channel gain estimation for multipath fading Code Division Multiple Access (CDMA) signals using the second order Divided Difference Filter (DDF). Given the nonlinear dependency of the channel parameters on the received signals in multiuser/multipath scenarios, we show that the DDF achieves better performance than its linear counterparts. The DDF, whi...

_______________________________________________________________________ Signal Fading can drastically affect the performance of terrestrial communication systems. Fading caused by multipath propagation can degrade the bit-error-rate (BER) performance of a digital communication system resulting data loss or dropped calls in a cellular system. So it is essential to understand the nature of multip...