Partial transmit sequence (PTS) scheme is one of the peak-to-average power ratio (PAPR) reduction technique in OFDM systems. In the PTS scheme, in order to generate signals with low PAPR, one OFDM symbol is partitioned into disjointed sub-blocks, and each sub-block is multiplied by a phase factor. For data recovery, receivers must have side information (SI), e. g. , phase factors, from transmitters. In the proposed method, the data recovery process in PTS-based OFDM systems is performed without SI. An additional pilot symbol is intentionally inserted at the end of each sub-block, so that efficient data decoding based on channel estimation can be executed with known pilot symbols. Also in existing method the OFDM symbols are processed in sequence order, it is modified into matrix order in order to achieve a fast data transaction. The simulation results shows that the Bit Error Rate (BER) performance without SI is approximately the same as compared to the BER performance of the PTS scheme with perfect SI and a maximum likelihood decoding scheme.

1. Alavi . A, Tellambura . C, and Fair . I, "PAPR reduction of OFDM signals using partial transmit sequence: An optimal approach using sphere decoding," IEEE Commun. Lett. , vol. 9, no. 11, pp. 982–984, Nov. 2005.
2. Hyunju Kim, Student Member, IEEE, Eonpyo Hong, Member, IEEE, Changjun Ahn, and Dongsoo Har "A Pilot Symbol Pattern Enabling Data Recovery Without Side Information in PTS-Based OFDM Systems," IEEE TRANSACTIONS ON BROADCASTING, VOL. 57, NO. 2, JUNE 2011
3. Cimini . S . J, Jr. Sollenberger . N . R, "Peak-to-average power ratio reduction of an OFDM signal using partial transmit sequences with embedded side information," in Proc. IEEE Global Telecommun. Conf. (GLOBECOM), San Francisco, CA, 2000, vol. 2, pp. 746–750.
4. Coleri . S, Ergen . M, Puri . M, and Bahai . A, "Channel estimation techniques based on pilot arrangement in OFDM systems," IEEE Trans. Broadcast. , vol. 48, no. 3, pp. 223–229, Sep. 2002.
5. Dan. L, Wang . J, He . X, and Li . S, "A phase recovering scheme for blind PTS-OFDM receiver over pilot symbols," in Int. Conf. Commun. Mobile Comput. , China, 2010, pp. 408–412.
6. Han . S and Lee . J, "PAPR reduction of OFDM signals using a reduced complexity PTS technique," IEEE Trans. Signal Process. Lett. , vol. 11, no. 11, pp. 887–890, Nov. 2004.
7. Han . S, Cioffi . M . J, and Lee . J, "On the use of hexagonal constellation for peak-to-average power ratio reduction of an OFDM Signal," IEEE Trans. Wireless Commun. , vol. 7, no. 3, pp. 781–786, Mar. 2008.
8. Han . T, Kim . N, Choi . J, and Lee . J, "A PTS-OFDM phase-superimposed over pilot symbols," in Proc. IEEE 10th Int. Conf. Adv. Commun. Technol. (ICACT), Korea, 2008, vol. 2, pp. 1027–1031.
9. Jayalath . A . D . S and Tellambura . C, "SLM and PTS peak-power reduction of OFDM signals without side information," IEEE Trans. Wireless Commun. , vol. 4, no. 5, pp. 2006–2013, Sep. 2005.
10. Jiang. T and Wu. Y, "An overview: Peak-to-average power ratio reduction techniques for OFDM signals," IEEE Trans. Broadcast. , vol. 54, no. 2, pp. 257–268, Jun. 2008.
11. Morelli . M and Mengali . U, "A comparison of pilot-aided channel estimation methods for OFDM systems," IEEE Trans. Signal Process. , vol. 49, no. 12, pp. 3065–3073, Dec. 2001.
12. Muller . S . H and Huber . J . B, "A novel peak power reduction scheme for OFDM," in Proc. IEEE Personal, Indoor and Mobile Radio Commun. (PIMRC), Finland, 1997, vol. 3, pp. 1090–1094.
13. Muller . S . H and Huber . J . B, "OFDM with reduced peak-to-average power ratio by optimum combination of partial transmit sequences," IEE Electron. Lett. , vol. 33, no. 5, pp. 368–369, Feb. 1997.
14. Zhou. Y and Jiang . T, "A novel multi-points square mapping combined with PTS to reduce PAPR of OFDM signals without side information," IEEE Trans. Broadcast. , vol. 55, no. 4, pp. 831–835, Dec. 2009.

Orthogonal Frequency Division Multiplexing (ofdm) Partial Transmits Sequence (pts) Peak-to-average Power Ratio (papr) Side Information (si).