Figure 4 - uploaded by Noha El-Ganainy
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The block diagram of the DS-CDMA decode-and-forward cooperative algorithm using the complete complementary code sets.
Source publication
This paper develops a practical receiver suggested for cooperative systems using decode-and-forward transmission and compares it to the theoretical sub-optimum ‚-MRC receiver model. The proposed receiver model adopts a channel blind ‚-combiner and employs a practical estimation of the combiner's weight ‚ that changes adaptively for each received bi...
Citations
... The adaptive combiner model, namely the k-combiner, is proposed. It calculates the combiner's weight adaptively for each incoming bit in a dynamic-blind method recently proposed by us [15]. The considered combiners are; the MRC, as applied in [11], the equal gain combiner EGC, as well as our recently proposed adaptive combiner [15]. ...
... It calculates the combiner's weight adaptively for each incoming bit in a dynamic-blind method recently proposed by us [15]. The considered combiners are; the MRC, as applied in [11], the equal gain combiner EGC, as well as our recently proposed adaptive combiner [15]. For a multi-rate CDMA half-duplex based transmission, the cooperative relaying is first compared to the conventional rate-matching algorithm to illustrate its impact on the overall performance. ...
... This paper investigates and compares the performance using other combiner types and proposes an adaptive combiner model to reach for the optimized receiver model. Two combiner models are employed and compared to the use of MRC; the equal gain combiner EGC as well as our recently proposed adaptive combiner [15]. We will first clarify the appropriate receiver model for a decode-and-forward cooperative transmission as approved by the literature in [16,17] then will exploit the details of the adaptive combiner model. ...
This paper proposes an adaptive combiner model that maximizes the performance of multi-rate cooperative relaying transmission in resources aware systems. Users’ cooperation is applied to smartly profit from the network resources to reach for efficient multi-rate transmissions. The low rate terminal uses a part of his bandwidth and power to relay the high rate user data side by side with his own data. This results in small performance degradation to the low rate user performance. The combiner model at the high rate terminal is carefully investigated for an optimized system performance and an adaptive combiner is proposed. The model calculates the weights adaptively for each bit based on a dynamic-blind method. The adaptive combiner is evaluated against the maximal-ratio combiner MRC and the equal gain combiner EGC to reach for the best model for the multi-rate relaying framework. Based on half-duplex mode, the probability of error performance is studied and compared for each combiner model under different channel conditions. The results show that the proposed adaptive combiner, characterized by its reliability and simplicity, leads to the best performance compared to the other models.
This paper proposes a novel green radio (GR)-mismatched Rake receiver structure for ultra-wideband (UWB) communications in non-line-of-sight (NLOS) underground mine tunnels. The proposed architecture provides a promising solution for wireless GR communications in underground mine tunnels with greater than 90% reduction in power consumption. The bit error rate (BER) and maximum allowable data throughput (MADTh) of the proposed receiver structure are investigated via theoretical analysis as well as Monte-Carlo simulations in UWB NLOS underground mine tunnels and are compared to the corresponding optimal structures. The proposed mismatched receivers achieve an approaching MADTh and BER performance to the corresponding optimal structures with 1.5 dB BER performance degradation.
