Analysis of Coded OFDM System over Frequency-Selective Fading Channels. (August 2003) Jun Zheng, B.S., Tsinghua University, P.R. China Chair of Advisory Committee: Dr. Scott L. Miller This thesis considers the analysis of system performance and resource allocation for a coded OFDM system over frequency selective fading channels. Due to the inseparable role taken by channel coding in a coded OFD...

As the generation grown up, designing of the wireless communication system towards providing best performance by the services such as high speed of data delivery, high capacity and high bit rate. MC-CDMA (Multi CarrierCode Division Multiple Access) is a desired technique for such cases, MC-CDMA gives best results by the combination of OFDM (Orthogonal Frequency Division Multiplexing) and CDMA (...

Abstract High speed and low latency have become the development trend of mobile communication network. Orthogonal frequency division multiplexing (OFDM) technology has key network due to its efficient transmission method. Space time block coding (STBC) introduces space correlation in signals sent by different antennas, so that diversity gains are obtained for multiple input output-OFDM (MIMO-OF...

A brief overview of MIMO-OFDM system design has been discussed and its key techniques are introduced. It also focuses on OFDM-based air interface, spatial channel modelling, transceiver design, channel estimation and minimizing the BER ratio by modifying the Maximum Likelihood function through channel estimation.

We investigate the performance of a pre-equalised OFDM system compared to that of a conventional OFDM system in a broadband fixed wireless access (BFWA) environment. Issues such as channel estimation requirements, signal power analysis and sub-channel blocking are investigated. Computer simulation results for pre -equalised and conventional systems in a fixed wireless environment (SUI-3 channel...

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...

Conventional OFDM transmission system uses a fixed-length Cyclic Prefix to counteract Inter-Symbol Interferences (ISI) caused by channel delay spreading under wireless mobile environment. This may cause considerable performance deterioration when the CP length is less than the channel RMS delay spread, or may decrease the system power and spectrum efficiency when it is much larger. A novel OFDM...

This paper discusses an adaptive modulation technique combined with space-frequency block coded OFDM(SFBC OFDM) over frequency selective channels and evaluates the performance in terms of the outdated channel state information(CSI) in mobile environments. This paper employs the Alamouti’s diversity scheme in multiple input multiple output OFDM (MIMO OFDM) and an adaptive modulation with enhance...

In this paper, proposed a joint estimation of Carrier Frequency Offset (CFO) and Channel Distortion for Multiple Input Multiple Output (MIMO) Orthogonal Frequency Division Multiplexing (OFDM) system using training sequences. Carrier Frequency Offset (CFO) acquisition algorithm and Carrier Frequency Offset (CFO) Tracking algorithm are proposed to improve the estimation accuracy of MIMO OFDM syst...