Code phase assignment DS/CDMA communications for indoor wireless Rician multipath fading channels

The technique of using a single basic signature sequence for the DS/CDMA system was investigated. All users have their sequences differing by cyclic phase shifts from a basic signature sequence. The technique is called code phase assignment (CPA). Yip and Ng (see IEEE/VTS 44th Vehicular Technology Conference, vol.3, p.1586, 1994), have shown that the CPA DS/CDMA technique yielded better performance over conventional DS/CDMA communications by a substantial reduction of the multiple access interference (MAI) and the multipath interference (MI) for a simplified channel model. This paper further investigates its performance in the indoor Rician multipath fading channel. A comparison with a conventional DS/CDMA system is made and the effect on the change of the system parameters is investigated. A higher multiple access capacity over a conventional DS/CDMA is demonstrated. CPA could reduce the effort of exhaustive search for sequences which makes it suitable for indoor applications.