The main objective of this paper is to investigate the performance trade off with MSK, BPSK and QAM_64 modulation techniques. Investigations have been reported to compare the performance and tradeoffs of MSK, BPSK and QAM_64 modulation schemes. Here modulation schemes have been identified which gives significant performance improvement over the other based on energy consumption and power recept...

In this paper we propose a new method to implement turbo codes over fading channels by extending the idea of turbo DPSK [3] to include turbo outer codes. An analytical tool has been developed to estimate the performance of extended turbo DPSK. A simulation study shows that extended turbo DPSK performs worse than BPSK modulated turbo codes with coherent detection. The energy inefficiency of exte...

In this paper, we investigate the application ofM -ary orthogonal modulation for multicarrier spread spectrum (MCSS) uplink transmission over a Rayleigh fading indoor channel. Different coherent detection strategies with perfectly known channel coefficients are analyzed. Furthermore, we present a decision-directed estimation receiver to apply channel phase estimation. With decision-directed est...

Modulation techniques have concerned increasing attention in optical wireless communications. Downlink transmission (base station to mobile terminal) using high data rate Mary Quadrature Amplitude Modulation (QAM), Quadrature Phase Shift Keying (QPSK) and Binary Phase Shift Keying (BPSK) modulation schemes are considered in a Wideband-Code Division Multiple Access (W-CDMA) system. QPSK or Quadr...

Wireless communication using Multiple Input Multiple Output (MIMO) systems increases spectral efficiency for a given total transmits power. Wireless communication technology has shown that the application of multiple antennas at both transmitter and receiver sides improve the possibility of high data rates through data rates through multiplexing or to improve performance through diversity compa...

A detail analysis of the performance of 2X2 MIMO (Multiple Input Multiple Output) antenna systems has been carried out for three different types of detectors at the receiver end by determining the transmit diversity using OSTBC multiplexing techniques. The transmission characteristics of the MIMO system have been determined for BPSK, QPSK and 16-QAM modulation schemes presuming Additive White G...

Abstract Aiming at the problem of estimation hybrid modulated signal combining Binary Phase Shift Keying and Linear Frequency Modulation (LFM-BPSK), existing methods have low accuracy in SNR. To solve this problem, algorithm based on Born-Jordan time-frequency distribution (BJD) is proposed, which uses Hough transform (HT) to estimate initial frequency chirp rate LFM-BPSK signal, then estimates...