Performance of a multidimensional BCM scheme with fading estimation based on time correlation

The combination of the channel fading compensation technique and the coded modulation technique is discussed. The system presented is considered to operate under correlated Rayleigh or Rician fading channels. The channel correlation property has been used to carry out channel fading compensation with the aid of periodically inserted pilot symbols. A multidimensional BCM (block coded modulation) scheme was used to improve the system error performances. On decoding, a corresponding trellis is used; therefore, the Viterbi algorithm and channel state information become available. The error performances of the system are investigated through computer simulations. Combined with the fading compensation, the multidimensional BCM scheme gives good error performances under various fading channels. For the Rayleigh fading channel, 7.5-dB coding gain has been achieved at a bit error rate (BER) of 10^-3. For the Rician fading channel with K=10 dB, the coding gain is 3.7 dB at BER=10^-4