A survey of two kinds of complementary coded CDMA wireless communications

Abstract

In this article, we present a comprehensive survey of existing literature in the area of complementary coded CDMA (CC-CDMA) technique for wireless communications to provide an introduction and overview to the field. According to the kinds of independent sub-channels, we divide the existing CC-CDMA solutions into two categories: time division multiplex (TDM) and frequency division multiplex (FDM) CC-CDMA systems. Then we compared them in terms of resistance of multiuser interference and multi-path interference, implementation complexity and spread and spectrum efficiency.

Review of Channel Estimation for Candidate Waveforms of Next Generation Networks

“…CDMA schemes are multiple access technologies that allow multiple users to simultaneously and asynchronously access a spectrum resource by modulating and spreading their information signals with pre-assigned signature codes or spreading codes which are orthogonal to one another [6]. CDMA offers several advantages over FDMA and TDMA such as improvement in spectral efficiency, larger system capacity, higher security and better anti-interference ability [7]. The first to the third generation of wireless networks is built based on the contention-free channel access schemes.…”

“…The first to the third generation of wireless networks is built based on the contention-free channel access schemes. The first generation (1G) of wireless networks became operational in 1979 [7]. It is known as analogue cellular systems because the design of these cellular systems is based on FDMA and analogue frequency modulation technology.…”

Image transmission performance of direct sequence code division multiple access communication systems in Weibull fading channels

“…Bu durumun bazı örnekleri; hücresel telefonlar, taksi şirketleri için radyo dağıtım büroları ve hava trafik kontrol iletişim sistemleridir. Spektrumu verimli şekilde paylaşmanın birçok yolu bulunmaktadır ve bu yolların her birinin avantaj ve dezavantajları mevcuttur [1]- [4]. Her bir kullanıcıya toplam bant genişliğinin bir bölümünü tahsis eden çoğullama sistemleri Frekans Çoğullamalı Çoklu Erişim (Frequency-division Multiple Access, FDMA) teknikleri olarak adlandırılmaktadır.…”