World Applied Sciences Journal 32 (2): 259-266, 2014 ISSN 1818-4952 © IDOSI Publications, 2014 DOI: 10.5829/idosi.wasj.2014.32.02.110 Corresponding Author: Maher Dababneh, Faculty of Engineering, Isra University Amman, Jordan. E-mail: m.dababneh@iu.edu.jo. 259 Bit Error Rate Performance of Orthogonal Multi-Carrier Code Division Multiple Access Signal in Frequency Selective Fading Channel Maher Dababneh and Ibrahim Awad Zamil Qatawneh 1 2 Faculty of Engineering, Isra University Amman, Jordan 1 Faculty of Engineering, Mutah University, AL-Karak, Postal Code : 61710, Jordan 2 Abstract: In this paper a new expression of the signal to noise ratio (SNR) for Group orthogonal Code Division Multiple access (GO-CDMA) in frequency selective fading is derived and investigated. The SNR performance for frequency selective fading channel is shown by computer simulation The wireless industry is currently undergoing a major transition from second generation (2G) to third generation (3G) wireless technologies and the increasing demands for communication services require higher transmission rates that further stimulates the demand on wideband technologies depicted in the form of code division multiple access (CDMA) on one hand. Also, as the privacy is a prime issue in modern communications then the carriers orthogonality is a fundamental concept for a sustainable development of the communications sector. This paper attempts to assess wireless communications channels and propose N strategic perspective, an analytical study into the performance of Group Orthogonal Multi Carrier Code Division Multiple Access (GO-MC-CDMA) in which sub carriers assigned to users which are orthogonal to other groups, the channel bandwidth is the main theme of this paper; from which the problems that may affect the communications link are high lighted and measures to counterbalance and alleviate multi path fading are proposed and investigated. Such measures are: Space diversity combining techniques and minimum – mean square error and interference cancellation and detection are considered in this research. Key words: Fading channel Code Division Multiple Access (CDMA) Multi user interference Additive White Gaussian Noise Frequency Division Multiple Access INTRODUCTION operation is in the frequency domain) and other spreads OFDM is a robust scheme to frequency selective given spreading code and then modulates a different fading, however, it has several disadvantages such as subcarrier with each of the data stream (the spreading difficulty in sub carrier synchronization and sensitivity operation in this is in the time domain); similar to a to frequency offset and nonlinear amplification, which normal direct sequence code division multiple access result from the fact that it is composed of a number of sub (DS-CDMA) scheme [1]. In order to exploit the maximum carriers with their overlapping power spectra and exhibits possible channel diversity while being able to a non-constant nature in its envelope. However, the accommodate dynamic load changes, a group combination of OFDM signaling and CDMA scheme has orthogonal multi carrier code division multiple access one major advantage that it can lower the symbol rate in (GO-MC-CDMA) scheme is developed. This scheme does each subcarrier so that a longer symbol duration makes it not require complex code assignment operations. The set easier to quasi-synchronize the transmissions. The Multi of subcarriers is partitioned into groups and the users carrier CDMA schemes are categorized mainly into two who are assigned sub carriers of the same group are groups: One spreads the original data stream using a separated using spreading codes. Furthermore, it can be given spreading code and then modulates a different sub seen that grouping the subcarriers together will help the carrier with each chip (in a sense that the spreading user to achieve full multi path diversity which is essential the serial-to-parallel (S/P) converted data streams using a