High data rate enhancement for beyond 3G services using complete complementary codes

Abstract

In this paper, we present a Multiple-InputMultiple-Output (MIMO) Code-Division-Multiple-Access (CDMA) communication system based on Complete Complementary (CC) codes (CC-CDMA) in a timedispersive (i.e. frequency-selective fading) channel. This system utilizes a novel combination, which consists of orthogonal CC codes for data spreading and a suitably designed Multi-User-Detector (MUD) algoaithm, in order to enhance the current 3rd Generation (3G) mobile systems. The simulation results for the CC-CDMA system, obtained in a frequency-selective fading channel, reveal significant improvement in Bit-Error-Rate (BER) performance, and consequently the achieved High Data Rates (HDR) compared with a conventional Walsh codes based MIMO CDMA (Walsh-CDMA) system.

An Interference-free MIMO-CDMA system Spread with Orthogonal Complementary Code for Multipath Fading Scenarios

“…Walsh code, the BER performance would degrade badly when number of users is increased, and the curves of BER v.s. SNR reveal 'platform phenomenon' [6]. It can be concluded that the performance gain of the proposed system is obvious in multi-user, frequency-selective fading channel conditions.…”

“…Hence the fading-resist ability of the proposed system is stronger than that of the MIMO CC-CDMA [6] utilizing only the first path component for data decision. Third, the system can provide both high data rate and low hardware complexity.…”

“…However, the hardware complexity is intolerable when the number of users and transmit antennas are large. In [6] a MIMO CC-CDMA system employing Complete Complementary (CC) code spreading and VBLAST scheme is proposed. By utilizing the correlation properties of the spreading codes, the system outperforms traditional MIMO-CDMA spread with Walsh codes, especially in frequency-selective fading channels.…”

“…First, both the interference-resistant ability of the OC codes and fading-resistant ability of MRC improve the BER performance of the system, enabling high level modulations to achieve high data rate in good SNR conditions. Second, the hardware complexity of the proposed system employing spatial delay multiplexing is reduced a lot compared to the MIMO CC-CDMA system employing VBLAST [6]. Third, only single receive antenna and Rake receiver are needed at the mobile terminal, which is easy to realize.…”