Performance improvement in DS-spread spectrum CDMA systems using a pre- and a post-RAKE

• Published in: 2000 International Zurich Seminar on Broadband Communications. Accessing, Transmission, Networking. Proceedings (Cat. No.00TH8475) pp. 39 - 46
• Main Authors: Barreto, A.N., Fettweis, G.
• Format: Conference Proceeding
• Language: English
• Published: Piscataway NJ IEEE 2000
• Subjects: Applied sciences; Communications technology; Downlink; Exact sciences and technology; Fading; Mobile communication; Multiaccess communication; Multipath channels; Radiocommunications; Resilience; Signal processing; Spread spectrum communication; Telecommunications; Telecommunications and information theory; Transmitters; Waveform; Mobile radiocommunication; Convolutional code; Transmission channel; Multipath propagation; Base band; Quadrature modulation; Modeling; Transceiver; Experimental result; System performance; Code division multiple access; Signal processing; Spread spectrum; Performance analysis; Delay line; Signal to noise ratio
• ISBN: 9780780359772; 0780359771
• DOI: 10.1109/IZSBC.2000.829226

Mobile communications systems based on code division multiple access (CDMA) and direct sequence spread spectrum techniques have been gaining a lot of ground lately. The RAKE receiver is a well known technique in spread spectrum systems, which is used to obtain signal diversity in multipath environments. In TDD systems, a technique known as pre-RAKE has been proposed recently, in which the signal processing is transferred to the transmitter, and it has been shown that this technique provides a capacity increase in the downlink. In this paper we propose a combination of both methods and show that a substantial performance improvement can be reached this way.