Joint Microstatistic Multiuser Detection and Cancellation of Nonlinear Distortion Effects for the Uplink of MC-CDMA Systems Using Golay Codes
نویسندگان
چکیده
The study in this paper underlines the importance of correct joint selection of the spreading codes for uplink of multicarrier code division multiple access (MC-CDMA) at the transmitter side and detector at the receiver side in the presence of nonlinear distortion due to high power amplifier (HPA). The bit error rate (BER) of system for different spreading sequences (Walsh code, Gold code, orthogonal Gold code, Golay code and Zadoff-Chu code) and different kinds of receivers (minimum mean-square error receiver (MMSE-MUD) and microstatistic multi-user receiver (MSF-MUD)) is compared by means of simulations for MC-CDMA transmission system. Finally, the results of analysis will show, that the application of MSF-MUD in combination with Golay codes can outperform significantly the other tested spreading codes and receivers for all mostly used models of HPA. Keywords—HPA, MC-CDMA, microstatistic filter, multi-user receivers, PAPR.
منابع مشابه
The 17th Annual IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC’06) JOINT MULTIUSER DETECTION AND CANCELATION OF NONLINEAR DISTORTION EFFECTS FOR THE UPLINK OF MC-CDMA SYSTEMS
In this paper we consider the uplink transmission in MCCDMA systems (MultiCarrier Coded Division Multiple Access). To reduce the envelope fluctuations of the transmitted signals, the MC-CDMA signal associated to each MT (Mobile Terminal) is submitted to a clipping device,followed by a frequency-domain filtering operation. We define an iterative receiver that jointly performs the MUD (MultiUser ...
متن کاملNonlinear Multiuser Receiver for Optimized Chaos-Based DS-CDMA Systems
Chaos based communications have drawn increasing attention over the past years. Chaotic signals are derived from non-linear dynamic systems. They are aperiodic, broadband and deterministic signals that appear random in the time domain. Because of these properties, chaotic signals have been proposed to generate spreading sequences for wide-band secure communication recently. Like conventional DS...
متن کاملEffects of Spreading Sequences on the Performance of MC-CDMA System with Nonlinear Models of HPA
Performance evaluation and comparison of multi-carrier code division multiple access (MC-CDMA) system model for different spreading sequences at the presence of Saleh and Rapp model of high power amplifier (HPA) is investigated. Nonlinear amplification introduces degradation of bit error performance and destroys the orthogonality among subcarriers. In order to avoid performance degradation with...
متن کاملIterative Detection for Mc-cdma System with Base Station Antenna Array for Fading Channels
Performance of a Multi-Carrier CDMA (MC-CDMA) system using iterative detection over a fading channel can be improved by incorporating antenna diversity at the base station (BS). In this paper we propose a new MC-CDMA system with multiple BS antennas to combat fading eeects. We consider only the uplink of a mobile in a terrestrial cell and derive the frequency selective MC-CDMA channel model usi...
متن کامل2-Dimensional OVSF Spread/Chip-Interleaved CDMA
Multiple-access interference (MAI) limits the bit error rate (BER) performance of CDMA uplink transmission. In this paper, we propose a generalized chip-interleaved CDMA with 2-dimensional (2D) spreading using orthogonal variable spreading factor (OVSF) codes to minimize the MAI effects and achieve the maximum available timeand frequency-domain diversity gains. We present the code assignment fo...
متن کامل