Iterative detection and phase recovery for downlink DS and MC-CDMA flat Rayleigh fading channels

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  2. Rui Fa
  3. Professor Bayan Sharif
  4. Dr Charalampos Tsimenidis
Author(s)Fa R, Sharif BS, Tsimenidis CC
Publication type Conference Proceedings (inc. Abstract)
Conference Name65th Vehicular Technology Conference
Conference LocationDublin
Year of Conference2007
Source Publication Date22-25 April 2007
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In this paper, iterative detection is applied in the receiver for downlink of both direct sequence (DS) and multi-carrier (MC) code division multiple access (CDMA) systems in the flat Rayleigh fading channels. A joint iterative detection and phase recovery scheme is proposed. Unlike the conventional bit-interleaved coded modulation with iterative decoding (BICM-ID) structure, the proposed receiver feeds the extrinsic information from soft-input soft-output (SISO) decoder back to update both the adaptive minimum mean squared error (MMSE) correlator and phase locked-loop (PLL) instead of de-mapper. We also investigate how the second-order PLL benefits from the iterative process over the time-varying flat Rayleigh fading channel. Simulation results illustrate that the iterative process significantly improves the performance of the adaptive detector by suppressing multiple access interference (MAI). Additionally, the tracking capability of PLL is enhanced by reducing the equivalent noise power.
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