Communications and Networking - download pdf or read online

By Jun Peng

ISBN-10: 9533071141

ISBN-13: 9789533071145

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Random access and cell search (Levanon & Mozeson, 2004; LTE, 2009). A BTPA-based CE technique is discussed in great detail in Section 5. , 2006; 2005; 2003) to replace the TD redundancy with null samples or known/pre-determined sequences. , 2006; 2005; 2003). , 2000). Meanwhile, PRP-OFDM replaces the null samples originally inserted between any two OFDM blocks in ZP-OFDM by a known sequence. , 2006; 2005; 2003). , 2005). TDS-OFDM works similarly to the PRP-OFDM and also belongs to this category of CEs assisted by TD redundancy.

SC-FDMA has been chosen in the LTE specifications as a promising uplink transmission technique because of its low PAPR. , 2006). In practice, pilot signals or reference signals for CE in SC-FDMA systems are inserted to occupy whole sub-channels periodically in the time direction, which can be considered to be BTPA. In this section, the signal model and system description of a BTPA-based CE technique is studied. The material discussed in this section can be found, in part, in a previous study (Huang & Lin, 2010).

Rather than inserting a blank GI between any two consecutive OFDM symbols, which was the method employed in the previous study (Weinstein & Ebert, 1971), a cyclic extension of an OFDM block is inserted into the original GI as a prefix to an information-bearing OFDM block. The adopted cyclic prefix (CP) effectively converts the linear convolution of the transmitted symbol and the channel impulse response (CIR) into the cyclic convolution; thus, orthogonality among sub-carriers can be maintained with channel time-dispersion if the CP is sufficiently longer than the CIR.

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Communications and Networking by Jun Peng


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