Adaptive Wireless Transceivers: Turbo-Coded, Turbo-Equalised and Space-Time Coded TDMA, CDMA, MC-CDMA and OFDM Systems

Quadrature Amplitude Modulation: From Basics to Adaptive Trellis-Coded, Turbo-Equalised and Space-Time Coded OFDM, CDMA and MC-CDMA Systems

Performance Comparison of Turbo Coded Mc-cdma and Ds-cdma with Higher Level Modulation

Multi-carrier code division multiple access (MC-CDMA), direct sequence code division multiple access (DS-CDMA) and orthogonal frequency division multiplexing (OFDM) are the major contenders for wireless signaling technique. For higher data rates, the use of higher level data modulation is desirable. In MC-CDMA [1], the data-modulated symbol to be transmitted is spread over a number of subcarrie...

Pilot-Assisted Adaptive Channel Estimation for Coded MC-CDMA with ICI Cancellation

One of the promising wireless access techniques for the next generation mobile communications systems is multi-carrier code division multiple access (MC-CDMA). MC-CDMA can provide good transmission performance owing to the frequency diversity effect in a severe frequency-selective fading channel. However, the bit error rate (BER) performance of coded MC-CDMA is inferior to that of orthogonal fr...

Analysis of the optimum spreading factor for MC-CDMA with RCPT-coded HARQ

In MC-CDMA, each user’s data-modulated symbol to be transmitted is spread over a number of subcarriers using an orthogonal spreading sequence defined in the frequency-domain. As the spreading factor SF becomes larger, the transmission performance improves due to increasing frequency diversity effect; however, the data rate per user decreases. The SF=1 system corresponds to an OFDM system. In an...

Application of Turbo-coded Hybrid ARQ to OFDM, Multicode DS-CDMA and Multicode MC-CDMA and their Performance Comparison

Abstract OFDM, MC-CDMA and DS-CDMA are being researched vigorously as the prospective signaling technique for the next generation of mobile communications systems, which will be characterized by the broadband packet technology. With packet transmission, hybrid ARQ (HARQ) will be inevitable for error control. HARQ with rate compatible punctured turbo (RCPT) codes is one of the promising techniqu...