Coding vs. Spreading Over Block Fading Channels

  • Ezio Biglieri
  • Giuseppe Caire
  • Giorgio Taricco
Part of the The Springer International Series in Engineering and Computer Science book series (SECS, volume 487)


In this chapter we study the optimum tradeoff of coding vs. spreading in a single-cell CDMA mobile communication system with block-fading, block-synchronous (but symbol-asynchronous) transmission, and slow power control. The optimization criterion we choose is based on system capacity, as measured in users/cell×bit/s/Hz,

We adopt an information-theoretic definition of outage: this is the event that the mutual information experienced by a user code word falls below the actual user code rate. The system capacity is then defined as above under decoding-delay and outage-probability constraints. We examine the conventional single-user receiver and a linear MMSE multiuser receiver. Our results show that, with ideal power control and optimum coding/spreading tradeoff, capacities close to 1 user/cell×bit/s/Hz are achievable by the conventional receiver, while the capacity gain offered by MMSE multiuser detection is moderate. With non-ideal power control MMSE multiuser detection is more attractive: in fact, it proves to be very robust to residual power-control errors, while conventional detection suffers from a large capacity degradation.


Mutual Information Fading Channel Power Control Code Rate System Capacity 
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Copyright information

© Springer Science+Business Media New York 1999

Authors and Affiliations

  • Ezio Biglieri
    • 1
  • Giuseppe Caire
    • 1
  • Giorgio Taricco
    • 1
  1. 1.Dipartimento di ElettronicaPolitecnico di TorinoTorinoItaly

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