Title :
Simplified BER formulations for MC-CDMA systems with orthogonality restoring combining
Author :
Zhang, Keli ; Guan, Yong Liang
Author_Institution :
Sch. of Electr. & Electron. Eng., Nanyang Technol. Univ., Singapore
Abstract :
Orthogonality restoring combining (ORC) performs better than maximum ratio combining (MRC) and equal gain combining (EGC) in multicarrier code division multiple access (MC-CDMA) systems under high load and high signal-to-noise-ratio (SNR) conditions. However, its exact bit error rate (BER) performance is complicated to evaluate. In this paper, the signal models for the MC-CDMA uplink and downlink channels are first unified. A lower bound and a tight approximation to the BER expressions of MC-CDMA with ORC are then developed. Both the lower bound and approximate BER expressions involve at most one-dimensional integration, hence they can be evaluated much more efficiently. The approximate BER expression is also numerically verified to be very tight under different fading conditions.
Keywords :
approximation theory; code division multiple access; diversity reception; error statistics; fading channels; radio links; BER formulations; MC-CDMA systems; bit error rate; downlink channels; equal gain combining; maximum ratio combining; multicarrier code division multiple access; orthogonality restoring combining; signal-to-noise-ratio; AWGN; Additive white noise; Bit error rate; Diversity reception; Downlink; Fading; Frequency diversity; Multicarrier code division multiple access; OFDM modulation; Signal restoration;
Conference_Titel :
Information, Communications and Signal Processing, 2003 and Fourth Pacific Rim Conference on Multimedia. Proceedings of the 2003 Joint Conference of the Fourth International Conference on
Print_ISBN :
0-7803-8185-8
DOI :
10.1109/ICICS.2003.1292538
