[PDF] Top 20 TO IMPROVE BIT ERROR RATE OF OFDM TRANSMISSION USING TURBO CODES

... the OFDM symbol is cyclically extended to avoid inter carrier ...an OFDM system, where the upper path is the transmitted chain and the lower part corresponds to the receiver ...information bit ... See full document

... video transmission system, which employs a Constant Bit Rate (CBR) video codec that is concatenated with one of of three error correction codecs, namely a Re- versible Variable-Length Code ... See full document

... analog transmission techniques do not perform well in mobile environment, since suitable techniques to mitigate the effects of multipath propagation induced fading have not been developed for these ...(ISI). ... See full document

... to improve the performance of a communication ...for transmission. On the other hand, OFDM (Orthogonal Frequency Division Multiplexing) is a technique for encoding the digital data on multiple ... See full document

... band transmission to mitigate inter symbol interference and enhance system ...by using various digital processing technique to combine the signal via various wireless path ...problem, OFDM system is ... See full document

... by using Turbo codes. Since their high error correction capability implies getting low errors, this method has high perfor- mance especially when compared to the last method presented in the ... See full document

... set using 8-bit data to represent each ...efficient error correcting coding is ...and transmission systems design compensates at the cost of significant additional ...image transmission ... See full document

... block codes are ...by using inverse fast fourier transform (IFFT) and cyclic prefix will be ...by using SLM signal with minimum BER is selected for the transmission, as shown in the figure ... See full document

... video transmission techniques over heterogeneous and unreliable channels has been an active research area over the last ...over error-prone heterogeneous channels meets additional challenges such as ... See full document

... code rate for turbo encoder as in the case of convolutional encoder, a parallel concatenation of two identical RSC encoders are used which gives a code rate of ...such turbo encoder is shown ... See full document

... OFDMA using the HEVC with turbo decoder that the video transmission is achieved by low data ...hand, Turbo codes can eliminate the residual inter symbol interference ( ISI ) and inter ... See full document

... The main idea of transmit diversity is to provide a diversity and/or coding gain by sending redundant signals over multiple transmit antennas (in contrast to spatial multiplexing, where independent bit sequences ... See full document

... typical turbo code used with the iterative turbo decoding ...the rate-specific Shannon bound varies with the information length N, with the choice of constituent encoders and interleaver, and with ... See full document

... with turbo codes have been considerably investigated in the recent ...is turbo coded prior to transmission. In the first transmission, the receiver operates as a regular turbo ... See full document

... estimaton error in determining the channel ...estimation error less than a certain threshold, at a given SNR, in order to achieve good ...of OFDM systems at a given SNR, as a function of the variance ... See full document

... 4: Bit error rate for different level of SNR (in dB) for –(a) modulation order 4, (b) modulation order 8 and (c) modulation order 16 with256 number of ...of bit error rate and ... See full document

... communication OFDM is the best choice & very famous multicarrier signaling format & used in many standards such as Long Term Evolution (LTE), wireless LAN (Local Area Network) Digital Audio & Video ... See full document

... minimum bit error rate is achieved at the distance between 50km-75km,512 sub-carrier for 16- ...the OFDM combining with RoF system increases the higher spectrum efficiency and the high ... See full document

... Video. OFDM is a multi-carrier transmission technique, which divides the available spectrum into many carriers, each one being modulated by a low rate data ...symbol rate to one N th of the ... See full document

... device using VLSI technology is expected For an optimized detector for digital signals the priority is not to reconstruct the transmitter signal, but it should do a best estimation of the transmitted data with the ... See full document