Abstract
The distributed space-time (frequency) coding and distributed channel turbo coding used independently represent two cooperative techniques that can provide increased throughput and spectral efficiency at an imposed maximum Bit Error Rate (BER) and delay required from the new generation of cellular networks. This paper proposes two cooperative algorithms that employ jointly the two types of techniques, analyzes their BER and spectral efficiency performances versus the qualities of the channels involved, and presents some conclusions regarding the adaptive employment of these algorithms.
Highlights
Most of the services that should be provided by future wireless networks require low or very low Bit Error Rate (BER) and delay values and high data rates
The two phases of the cooperation protocol applied to this topology are illustrated in Figure 1 for the downlink (DL) connection; that is, the broadcast message is transmitted to the relay nodes (RNs) and user terminals (UTs), while the relay message, which depends on the Distributed Forward Error Correction Coding (DFEC) algorithm employed, is transmitted jointly by the two RNs using a cooperative diversity scheme, like Distributed Space-Time Coding (DSTC) or Distributed Space-Frequency Coding (DSFC)
This paper has studied the BER and spectral efficiency performances provided in some relevant DL and UL scenarios
Summary
Most of the services that should be provided by future wireless networks require low or very low BER and delay values and high data rates. The cooperative transmission techniques represent one of the most promising solutions in wireless networks for provisioning the increased capacity, extended coverage, and improved fairness [1,2,3] required by such services They could ensure low BER, while still inserting limited transmission delays, and significantly improve the spectral efficiency of wireless systems. In [14], Distributed Space-Frequency Block Coding (DSFBC) schemes for OFDM-based cellular systems which use an antenna array at the BS and a single antenna at both the UT and RN have been proposed. Another cooperative approach that aims at exploiting diversity is the Distributed Forward Error Correction Coding (DFEC).
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