TAILIEUCHUNG - Mobile and wireless communications physical layer development and implementation Part 10

Tham khảo tài liệu 'mobile and wireless communications physical layer development and implementation part 10', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Iterative Joint Optimization of Transmit Receive Frequency-Domain Equalization in Single Carrier Wireless Communication Systems 171 performance of the SC systems using the proposed method is improved by about at BER 10-3 compared to the case of the conventional receive FDE. b t T Fig. 4. BER performance of the SC system using the proposed method as a function of Eb No where normalized delay spread values in figures a and b are t T and t T . 172 Mobile and Wireless Communications Physical layer development and implementation Fig. 5. BER performance of the SC system using the proposed method as a function of the number of feedback taps in decision-feedback filter where Eb No and normalized delay spread is r T . Fig. 6. BER performance of the SC system using the proposed method as a function of normalized delay spread where Eb N0 is set to . When decision-feedback filter is adopted in both systems the proposed system achieves better BER performance than case using the conventional one in lower Eb N0 region. On the other hand in higher Eb N0 region it can be seen that BER performance of the proposed Iterative Joint Optimization of Transmit Receive Frequency-Domain Equalization in Single Carrier Wireless Communication Systems 173 system becomes close to that of the conventional one as Eb No increases. In addition it can be seen that difference between the proposed method and VC with adaptive bit and power loading in BER performance is about at BER 10-4. Figure 5 shows BER performance of the proposed and conventional SC systems with decision-feedback filter as a function of the number of feedback taps Nfb where Eb N0 and normalized delay spread t T is . The maximum delay time difference between the first path and last path is set to . In general the required number of taps in decision feedback filter is 9 to suppress intersymbol interference. In Figure 5 both the proposed and conventional systems achieves almost

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