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Performance of LDPC Coded IEEE 802 . 11 n OFDM System with Unequal Error Protection and Varying FFT Size
| Content Provider | Semantic Scholar |
|---|---|
| Author | Fowdur, Tulsi Pawan Makhun, K. |
| Copyright Year | 2019 |
| Abstract | FDM based systems have gained in popularity over the past decades as their data transmission rate is very high, especially when combined with standards such as the IEEE 802.11n. However, this standard is mostly employed for relatively small indoor environment use where the path delays are small. If this technique is used in large indoor environments, fading will significantly affect the signals as the delays are large. The aim of this paper is to analyse the Bit Error Rate (BER) performance of an IEEE 802.11n based OFDM system by varying the FFT size as well as the symbol duration (Ts). An Unequal Error Protection (UEP) scheme based on prioritized constellation mapping is also used to enhance the performance. The performance of the LDPC based OFDM system is first tested using the standard 64-point FFT, with block-length 648, code rate 1/2 for 16 and 64 QAM modulation. The system was then analysed with different FFT and Ts values. For the 16 QAM modulation, when comparing the Eb/N0 values for Ts 5μs with FFT size 64 against Ts 9μs with FFT size 512, a gain of 13.6 dB is obtained at a BER of 2 × 10, without using the UEP scheme, while an additional 0.4 dB is obtained when the UEP scheme is used. For the 64 QAM modulation, a gain of 22.4 is obtained at a BER of 10, without using the UEP scheme, when comparing the Eb/N0 values for Ts 5μs with FFT size 64 against Ts 9μs with FFT size 512, while an additional 0.6 dB is obtained when the UEP scheme is used. The results show that when the IEEE 802.11n needs to be used in large indoor environments, such as huge storehouses or shopping malls, higher FFT size together with UEP provides better performance. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://www.aeuso.org/includes/files/articles/Vol9_Iss31_4047-4059_Tracking_of_a_PID_Driven_Differenti.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
