Rician channel characterization in OFDM systems

Pirsiavash, Ali; Emadi, Mohammad Javad

doi:10.1109/iraniancee.2015.7146229

Cited by 2 publications

(4 citation statements)

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“…Therefore, there is a point at which decreasing the code rate will not offer any more performance improvements in error rate [38]. This is why the C r = 9 15 system gives the best performance as shown in Fig. 8, Fig.…”

Section: Optimal Code Ratementioning

confidence: 97%

“…However, from the figures, it can seen that decreasing the code rate do not necessarily improve the performance of the OFDM-RS system over the channel even at high Rician K factor. In fact, C r = 9 15 gives the best performance both for the hard-decision and soft-decision RS decoding algorithms, and for K=1-10. From the studies of FEC, it is well known that low-rate codes are proficient in correcting more errors as compared to high-rate codes.…”

Section: Optimal Code Ratementioning

confidence: 98%

“…The effect of the Rician K factor on the RS code rate, C r is verified in this section. In the simulation runs, we selected four different codes rates, C r = 5 15 , 7 15 , 9 15 , 11 15 , and a fixed Doppler frequency, F D = 100Hz. Besides, a pilot spacing of 4 is assumed in LS channel estimation.…”

Section: Optimal Code Ratementioning

confidence: 99%

“…Different channel estimation techniques have been proposed in literature for OFDM systems over Rician fading channels. For instances, see [1,[6][7][8][9]. The major emphasis have been to improve the quality of the received signal, most especially when the power in the scattered paths is more than the power in the direct paths (Rician K factor < 1).…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

On the Analysis of Reed-Solomon Codes for OFDM Systems over Rician Fading Channels

2017

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The relative strength between the direct and the scattered paths of the received signal in wireless communication as described by the Rician factor K specifies the quality of the transmission link. Fading in Rician channel models influence the performance of Orthogonal Frequency Division Multiplexing (OFDM) systems. Accordingly, channel estimation together with different Forward Error Correction (FEC) schemes are used to provide significant performance gain for OFDM systems over fading channels. In most literature, the performance of FEC schemes such as Turbo and LDPC codes have been analysed for OFDM systems over frequency-selective Rician fading channels. This paper evaluates the performance of Reed-Solomon (RS) codes over frequency-selective Rician fading channels. The performance of RS codes is firstly studied for different Rician K factors and Doppler frequencies. Secondly, the performance of RS codes is reviewed assuming different code rates k n for both hard-decision and soft-decision decoding algorithms. The Euclidean algorithm (EA) is used as the RS hard-decision decoding algorithm while the Parity-check Transformation Algorithm (PTA) is deployed as the RS soft-decision decoding algorithm. The results for the various channel and coding conditions are documented through computer simulations. The simulation results validate the importance of a high Rician K factor. Interestingly, the simulation results verify that adopting a low-rate code do not necessarily improve the error rate irrespective of the Rician K factor. This analysis is relevant in order to establish the performance of combined RS codes with OFDM systems over frequency-selective Rician fading channels.

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Section: Optimal Code Ratementioning

confidence: 97%

Section: Optimal Code Ratementioning

confidence: 98%