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Multi-code Biorthogonal Code Keying with Constant Amplitude Coding Combined with $Q^{2}PSK$ to Increase Bandwidth Efficiency  

Kim Sung-Pil (한국정보통신기능대학 정보통신설비과)
Kim Myoung-Jin (한국외국어대학교 정보통신공학과)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.31, no.5A, 2006 , pp. 484-492 More about this Journal
Abstract
A multi-code biorthogonal code keying(MBCK) system consists of multiple waveform coding block, and the sum of output codewords is transmitted. Drawback of MBCK is that it requires amplifier with high linearity because its output symbol is multi-level. MBCK with constant amplitude preceding blcok(CA-MBCK) has been proposed, which guarantees sum of orthogonal codes to have constant amplitude. Redundant bits of CA-MBCK for constant amplitude coding are not only used to make constant amplitude signal but also used to improve the bit error rate(BER) performance at receiver. In this paper, we proposed a transmission scheme which combine CA-MBCK with $Q^{2}PSK$ to improve bandwidth efficiency of CA-MBCK. The BER performance of the scheme is same that of CA-MBCK in additive white gaussian noise(AWGN). And we showed that BER performance of the proposed system can be improved using redundant bits of constant amplitude preceding.
Keywords
Multi-Code; Constant Amplitude; Bandwidth Efficiency;
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