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Channel estimation is an important issue in orthogonal frequency division multiplexing (OFDM) systems to improve the performance of system. For OFDM based IEEE 802.11ad wireless local area network (WLAN), two types of symbols, training symbols and pilot symbols, can be used for channel estimation in the OFDM receiver. We analyze the algorithms of channel estimation methods based on symbol types, training...
In this paper, a new carrier frequency offset (CFO) estimation algorithm is proposed for MIMO-OFDM based wireless local area network (WLAN) systems, IEEE 802.11ad. The existing hardware-efficient auto-correlation scheme which subsamples the short train symbol can be used for low-complexity. However this method has a limitation of performance degradation. Therefore, we combine the subsampled auto-correlation...
This paper presents a hardware-efficient autocorrelation scheme for the synchronization of MIMO-OFDM based wireless local area network (WLAN) systems, such as IEEE 802.11n. Carrier frequency offset (CFO) estimation for the frequency synchronization requires high complexity autocorrelation operations of many training symbols. In order to reduce the hardware complexity of the MIMO-OFDM synchronization,...
A new technique is proposed for efficient encoding of low density parity check (LDPC) codes using the concept of approximate lower triangulation (ALT). Parity check matrix is preprocessed and encoded in O(n) complexity. This encoding technique is applied in the IEEE 802.11n based H matrix where the complexity is compared with the Richardson algorithm. The proposed adaptive message length (AML) encoding...
In this paper, we propose a low-complexity carrier frequency offset (CFO) estimation algorithm for OFDM based wireless LAN, IEEE 802.11a. The complexity of the arctangent operation to calculate the argument of auto-correlation for CFO estimation is reduced by a novel range pointer method. The proposed algorithm estimates fine CFO value first and then based on the fine CFO value, simple criteria is...
In this paper, we present a timing synchronization scheme of the next generation IEEE 802.tin wireless LAN standard which is based on MIMO-OFDM technique. The proposed timing synchronization method takes two steps which consist of two modified auto-correlators. For coarse timing synchronization, a sliding window differentiator is used after a conventional auto-correlation in order to avoid plateau...
In this paper, a robust, low-complexity timing synchronization algorithm suitable for 5.9 GHz advanced dedicated short range communications (ADSRC) system and its efficient hardware implementation is proposed. Cross-correlation technique is used to detect the starting point of short training symbol and the guard interval of the long training symbol. The design is implemented in a Xilinx Vertex-II...
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