Title :
Combined coding for error control and increased robustness to system nonlinearities in OFDM
Author :
Jones, A.E. ; Wilkinson, T.A.
Author_Institution :
Motorola GPD Res., Swindon, UK
Abstract :
A combined coding scheme for error control and reduced peak to mean envelope power ratio (PMEPR) in OFDM is presented. The proposed scheme and an algorithm for finding the optimum code set for achieving minimum PMEPR is described in detail. The process is illustrated by means of an example, and it is shown that a 4 dB improvement is possible for an (8,4) linear block code. The method is extended to consider larger code sets of lower rate which are expanded through the use of polyphase sequences that are found by means of a natural algorithm. Preliminary results indicate that the PMEPR can be further improved by use of such sequences. Finally, the BER performance of the combined coding method in a typical nonlinear channel is presented
Keywords :
Gaussian channels; block codes; channel coding; coding errors; error statistics; frequency division multiplexing; linear codes; sequences; AWGN channel; BER performance; algorithm; combined coding; error control; linear block code; nonlinear channel; optimum code set; peak to mean envelope power ratio; polyphase sequences; system nonlinearities; Bit error rate; Block codes; Channel coding; Convolution; Convolutional codes; Error correction; Fading; Frequency diversity; OFDM; Robust control;
Conference_Titel :
Vehicular Technology Conference, 1996. Mobile Technology for the Human Race., IEEE 46th
Conference_Location :
Atlanta, GA
Print_ISBN :
0-7803-3157-5
DOI :
10.1109/VETEC.1996.501442
