High-throughput high-performance OFDM via carrier interferometry approaches for complex signaling
نویسندگان
چکیده
Carrier Interferometry (CI) approaches, including Carrier-Interferometry Orthogonal Frequency Division Multiplexing (CI/OFDM) and Pseudo-Orthogonal Carrier-Interferometry OFDM (PO-CI/OFDM), have been proposed to enhance OFDM’s performance and reduce OFDM’s peak-to-average power ratio (PAPR). However, the existing high-throughput, high-performance PO-CI/OFDM system is limited for real signaling. This paper first proposes to use Inverse Fast Fourier Transform (IFFT)/Fast Fourier Transform (FFT), instead of vector-matrix multiplication, to implement the spreading/despreading in CI/OFDM and PO-CI/OFDM. Secondly, PO-CI/OFDM system is proved not applicable for complex signaling. Based on the analysis of CI spreading codes, PO-CI spreading codes and CI/OFDM system, a novel OFDM system architecture, named CI-POCI/OFDM, is introduced to provide double-throughput, high-performance for complex signaling. Furthermore, PAPR problem of traditional OFDM is also eliminated in CI-POCI/OFDM system.
منابع مشابه
High-Performance 64-QAM OFDM via Carrier Interferometry Spreading Codes
Abstract OFDM (Orthogonal Frequency Division Multiplexing) is an excellent technology that will almost certainly play a large role in next generation wireless communication systems. However, in OFDM, no frequency diversity is exploited to improve BER performance. Today’s OFDM systems attempt to overcome this limitation by application of channel coding and interleaving, which requires a reductio...
متن کاملAnalysis and Comparison of PAPR Reduction Techniques in OFDM Systems
The destructive impact of fading environments and also bandwidth limitations are two main challenges which communication is dealing with them. These challenges can affect on the growth of wireless communication and even cause reliable communications and high data rate to be prevented. Thus, OFDM (Orthogonal Frequency Division Multiplexing) modulation by using of fast calculation hardwares such ...
متن کاملIjpres Efficient Method for Reducing Ici in Ofdm Systems
Inter Carrier Efficient Method for falling ICI in OFDM Systems Interference (ICI) attributable to the Carrier Frequency Offset (CFO) and Doppler shifts; highly disgrace the performance of OFDM system. For OFDM communication system which is a capable technique for high data rate transmission, the theoretical BER and CIR are complicated to obtain in presence of ICI. The BER of the expected signal...
متن کاملUsing WPT as a New Method Instead of FFT for Improving the Performance of OFDM Modulation
Orthogonal frequency division multiplexing (OFDM) is used in order to provide immunity against very hostile multipath channels in many modern communication systems.. The OFDM technique divides the total available frequency bandwidth into several narrow bands. In conventional OFDM, FFT algorithm is used to provide orthogonal subcarriers. Intersymbol interference (ISI) and intercarrier interferen...
متن کاملConcatenated Precoded OFDM for Residual CFO Effect Mitigation
Orthogonal frequency-division multiplexing (OFDM) is a popular transmission technique in wireless communications [1]-[3], primarily because it enables ef cient implementation by discrete Fourier transform (DFT) and easily avoids intersymbol interference by inserting suf ciently long guard intervals. However, spectrally overlapping data-modulated subcarriers make OFDM systems sensitive to carrie...
متن کامل