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A flexible and high performance cellular mobile communications system based on Orthogonal Multi-Carrier SSMA

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Abstract

The conventional Direct-Sequence Spread-Spectrum-Multiple-Access (DS-SSMA) system with RAKE-receiver is an interesting approach in mobile communications in order to combat the frequency selectivity of the channel. The main advantages of DS-SSMA are well known, but its capacity is limited by other-user interference. Another interesting SSMA technique that combats the frequency selectivity of the channel and achieves high spectral efficiency is based on Orthogonal-Frequency-Division-Multiplexing (OFDM). This new SSMA technique combines the principles of DS-SSMA with OFDM and is called Multi-Carrier Spread-Spectrum-Multiple-Access (MC-SSMA). By providing high frequency diversity, this combination enables the possibility to perform a maximum-likelihood detection (MLD) resulting in high performance/capacity, to use the spectrum in an efficient way and to retain many advantages of the conventional DS-SSMA system. In addition, it allows both simple cell-separation by using frequency hopping and simple hardware realization. An example for the downlink of a mobile communications system, i.e. the transmission from the base station to a mobile station, using MC-SSMA with Walsh-Hadamard code spreading is studied. Different coherent detection algorithms such as conventional detection, MLD, and iterative detection are analyzed. The analytical performance of MLD is evaluated. It is also shown analytically, and by simulations that the MC-SSMA system with MLD outperforms the DS-SSMA system with RAKE-receiver. Up to 64 active users can be transmitted in a 1.25 MHz bandwidth. Each user has a rate of 16.0 kbit/s by using BPSK modulation. At a signal to noise ratio (SNR) of 13 dB a bit error probability ofP b =10−3 can be guaranteed without channel coding. This results in a spectral efficiency of about 0.8 bit/s/Hz. Under the same conditions the conventional DS-SSMA system results in a spectral efficiency of about 0.15 bit/s/Hz. Hence, using MC-SSMA for the downlink of a cellular mobile communications system is a promising approach.

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Authors and Affiliations

  1. German Aerospace Research Establishment (DLR), Institute for Communications Technology, D-82234, Oberpfaffenhofen, Germany

    K. Fazel, S. Kaiser & M. Schnell

Authors
  1. K. Fazel
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  2. S. Kaiser
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  3. M. Schnell
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Additional information

Part of this work was carried out within the CODIT project in the RACE-2 programme organized by the CEC and was supported by PKI-AG, Germany.

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Fazel, K., Kaiser, S. & Schnell, M. A flexible and high performance cellular mobile communications system based on Orthogonal Multi-Carrier SSMA. Wireless Pers Commun 2, 121–144 (1995). https://doi.org/10.1007/BF01099534

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