Performance Improvement and Envelope Variation Reduction of Multi-Code Parallel Combinatory CDMA Systems Using Bi-Orthogonal Modulation

Bi-Orthogonal Modulation을 이용한 Multi-code Parallel Combinatory CDMA System의 성능 개선 및 진폭 변동 감소 방안

In this paper, we present a multi-code parallel combinatory CDMA system using bi-orthogonal modulation to reduce envelope variation and improve bit error. .rate (BER) performance. In general, the dynamic range of the amplitude of the transmit signal is very large in the case of conventional multi-code CDMA systems, resulting in severe nonlinear distortion due to high power amplifier and thus significant BER performance degradation. The proposed system exhibits reduction of peak-to-average power ratio (PAPR) of the transmit signal amplitudes and significant performance improvement. We verify the performance of the proposed system by computer simulations under AWGN channel and flat fading channel.