• Journal of Internet Computing and Services
    ISSN 2287 - 1136(Online) / ISSN 1598 - 0170 (Print)
    http://jics.or.kr/

CACB-Q2AM Modulation for High Bandwidth Efficiency and Constant Amplitude Signal Transmission


Dae-Ki Hong, Sung-Jin Kang, Journal of Internet Computing and Services, Vol. 9, No. 1, pp. 21-32, Feb. 2008
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Keywords: CACB, $Q^2$AM, CACB-CA-$Q^2$AM, Constant Amplitude

Abstract

In this paper, we propose new modulation schemes using the conventional CACB (Constant Amplitude Coded Multicode Biorthogonal) modulation with constant amplitude property. Also the proposed modulation schemes supports high transmission data rate by increasing the spectral efficiency, In order to obtain the high spectral efficiency, the $Q^2$AM (Quadrature-Quadrature Amplitude Modulation) and CA-$Q^2$AM (Constant Amplitude-$Q^2$AM) are used. We explain the simplest combining modulation scheme of CACB and $Q^2$AM (i.e., CACB-$Q^2$AM). However, this modulation scheme cannot support the constant amplitude property. Hence the first CACB-CA-$Q^2$AM (or CACB-CA-$Q^2$AM I) modulation scheme is proposed for the constant amplitude property. In the modulation scheme, the redundant constant amplitude encoding (spectral efficiency decrease) is required. Therefore, the second CACB-CA-$Q^2$AM (or CACB-CA-$Q^2$AM II) modulation scheme is proposed retaining the constant amplitude and the spectral efficiency. Computer simulations show that the proposed CACB-CA-$Q^2$AM II is the efficient modulation scheme.


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Cite this article
[APA Style]
Dae-Ki Hong and Sung-Jin Kang (2008). CACB-Q2AM Modulation for High Bandwidth Efficiency and Constant Amplitude Signal Transmission. Journal of Internet Computing and Services, 9(1), 21-32.

[IEEE Style]
D. Hong and S. Kang, "CACB-Q2AM Modulation for High Bandwidth Efficiency and Constant Amplitude Signal Transmission," Journal of Internet Computing and Services, vol. 9, no. 1, pp. 21-32, 2008.

[ACM Style]
Dae-Ki Hong and Sung-Jin Kang. 2008. CACB-Q2AM Modulation for High Bandwidth Efficiency and Constant Amplitude Signal Transmission. Journal of Internet Computing and Services, 9, 1, (2008), 21-32.