Pilot design for OFDM with null edge subcarriers
Pilot symbol assisted modulation (PSAM) orthogonal frequency division multiplexing (OFDM) has proven to be a popular technique for high-speed communication through multipath fading channels. In this paper we examine PSAM pilot design optimization in OFDM systems that employ edge null subcarriers for...
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| Veröffentlicht in: | IEEE transactions on wireless communications 2009-01, Vol.8 (1), p.396-405 |
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| creator | Baxley, R.J. Kleider, J.E. Zhou, G.T. |
| description | Pilot symbol assisted modulation (PSAM) orthogonal frequency division multiplexing (OFDM) has proven to be a popular technique for high-speed communication through multipath fading channels. In this paper we examine PSAM pilot design optimization in OFDM systems that employ edge null subcarriers for spectral shaping. Specifically, we show that the commonly used even pilot spacing design is suboptimal in terms of symbol estimate mean squared error (MSE) performance when a sufficient number of null subcarriers are present. We pursue a parametric design of the pilot spacings and use convex optimization techniques in order to find a pilot design that results in near-optimal symbol estimate MSE performance. Finally, we present several example PSAM OFDM pilot designs including one example based on the IEEE 802.16 standard to demonstrate performance improvements over the conventional even-spacing pilot design when null edge subcarriers are present. |
| doi_str_mv | 10.1109/T-WC.2009.080065 |
| format | Article |
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In this paper we examine PSAM pilot design optimization in OFDM systems that employ edge null subcarriers for spectral shaping. Specifically, we show that the commonly used even pilot spacing design is suboptimal in terms of symbol estimate mean squared error (MSE) performance when a sufficient number of null subcarriers are present. We pursue a parametric design of the pilot spacings and use convex optimization techniques in order to find a pilot design that results in near-optimal symbol estimate MSE performance. Finally, we present several example PSAM OFDM pilot designs including one example based on the IEEE 802.16 standard to demonstrate performance improvements over the conventional even-spacing pilot design when null edge subcarriers are present.</description><subject>Applied sciences</subject><subject>Bit error rate</subject><subject>Channel capacity</subject><subject>Design engineering</subject><subject>Design optimization</subject><subject>Digital video broadcasting</subject><subject>Estimates</subject><subject>Exact sciences and technology</subject><subject>Frequency division multiplexing</subject><subject>High speed</subject><subject>Information, signal and communications theory</subject><subject>MIMO</subject><subject>Modulation</subject><subject>Modulation, demodulation</subject><subject>Multiplexing</subject><subject>OFDM modulation</subject><subject>Orthogonal Frequency Division Multiplexing</subject><subject>Peak to average power ratio</subject><subject>Pilots</subject><subject>Signal and communications theory</subject><subject>Spectra</subject><subject>Subcarriers</subject><subject>Symbols</subject><subject>Systems, networks and services of telecommunications</subject><subject>Telecommunications</subject><subject>Telecommunications and information theory</subject><subject>Transmission and modulation (techniques and equipments)</subject><subject>Wireless communication</subject><subject>Wireless LAN</subject><issn>1536-1276</issn><issn>1558-2248</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2009</creationdate><recordtype>article</recordtype><sourceid>RIE</sourceid><recordid>eNp9kE1Lw0AQhhdRsFbvgpcgqKfU2c9sjhKtCpV6qPS4bDabmpImdTdB_PduaOnBgzAwM8wzLzMvQpcYJhhDer-Il9mEAKQTkACCH6ER5lzGhDB5PNRUxJgk4hSdeb8GwIngfITgvarbLiqsr1ZNVLYumk8f36LvqvuMmr6uI1usbOT73GjnKuv8OTopde3txT6P0cf0aZG9xLP582v2MIsNlbSLc0pzrhnjCZdMWsJTEIkwBpsyD7dAkYdWpExgY9OUMlEQlpuiJBxKLq2lY3S309269qu3vlObyhtb17qxbe-VTDgQKiQN5O2_JGWcCEqSAF7_Addt75rwhZICQwjOAgQ7yLjWe2dLtXXVRrsfhUENTquFWmZqcFrtnA4rN3td7Y2uS6cbU_nDHsFABUkH6asdV1lrD2OWSMEJ0F_1XINe</recordid><startdate>200901</startdate><enddate>200901</enddate><creator>Baxley, R.J.</creator><creator>Kleider, J.E.</creator><creator>Zhou, G.T.</creator><general>IEEE</general><general>Institute of Electrical and Electronics Engineers</general><general>The Institute of Electrical and Electronics Engineers, Inc. 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In this paper we examine PSAM pilot design optimization in OFDM systems that employ edge null subcarriers for spectral shaping. Specifically, we show that the commonly used even pilot spacing design is suboptimal in terms of symbol estimate mean squared error (MSE) performance when a sufficient number of null subcarriers are present. We pursue a parametric design of the pilot spacings and use convex optimization techniques in order to find a pilot design that results in near-optimal symbol estimate MSE performance. Finally, we present several example PSAM OFDM pilot designs including one example based on the IEEE 802.16 standard to demonstrate performance improvements over the conventional even-spacing pilot design when null edge subcarriers are present.</abstract><cop>New York, NY</cop><pub>IEEE</pub><doi>10.1109/T-WC.2009.080065</doi><tpages>10</tpages></addata></record> |
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| identifier | ISSN: 1536-1276 |
| ispartof | IEEE transactions on wireless communications, 2009-01, Vol.8 (1), p.396-405 |
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| source | IEEE Electronic Library (IEL) |
| subjects | Applied sciences Bit error rate Channel capacity Design engineering Design optimization Digital video broadcasting Estimates Exact sciences and technology Frequency division multiplexing High speed Information, signal and communications theory MIMO Modulation Modulation, demodulation Multiplexing OFDM modulation Orthogonal Frequency Division Multiplexing Peak to average power ratio Pilots Signal and communications theory Spectra Subcarriers Symbols Systems, networks and services of telecommunications Telecommunications Telecommunications and information theory Transmission and modulation (techniques and equipments) Wireless communication Wireless LAN |
| title | Pilot design for OFDM with null edge subcarriers |
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