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In this paper we propose a multiple access scheme using multi-symbol encapsulated orthogonal frequency division multiplexing (MSE-OFDM) with reduced computational complexity. MSE-OFDM is a bandwidth efficient OFDM scheme, where a number of OFDM symbols are grouped together as a frame and protected by one single cyclic prefix (CP). This improves the bandwidth efficiency and robustness of the system...
The excellent performance exhibited by the turbo codes is attributed, partly to the use of soft-in soft-out algorithms (SISO) and iterating the soft output between the constituent signal processors in the turbo decoder. The maximum a posteriori probability (MAP) and soft output Viterbi algorithm (SOVA) have been used as the workhorse of receivers that employ turbo principle. The MAP is preferred to...
In this work, we study the effect of frequency dependent IQ mismatch (TX and RX) for a wideband OFDM system. We develop a joint channel response and IQ mismatch estimation scheme that can implicitly take care of frequency dependent IQ mismatch occurring at both TX and RX. We also propose a modified frequency domain equalizer structure that can work with the above estimates to efficiently remove the...
The soft output Viterbi algorithm (SOVA) is used for data detection in indoor wireless channels representative of the JTC and wireless local area network (WLAN). The performance of SOVA-SOVA permutation as an equalizer followed by a decoder is evaluated by simulation experiment. The performance does not improve much for more than three iterations in these ISI channels. The results obtained for 1 dB...
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