Effects of carrier frequency accuracy on quasi-synchronous, multicarrier DS-CDMA communications using optimized sequences
It is known that the multiple access interference (MAI) of a quasi-synchronous (QS) multicarrier direct signal code division multiple access (DS-CDMA) system can be substantially reduced by using signature sequences having optimized cross correlation at small shifts around the origin. This paper sho...
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| Veröffentlicht in: | IEEE journal on selected areas in communications 1999-11, Vol.17 (11), p.1915-1923 |
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| container_title | IEEE journal on selected areas in communications |
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| creator | Yip, Kun-Wah Ng, Tung-Sang |
| description | It is known that the multiple access interference (MAI) of a quasi-synchronous (QS) multicarrier direct signal code division multiple access (DS-CDMA) system can be substantially reduced by using signature sequences having optimized cross correlation at small shifts around the origin. This paper shows that the time-frequency cross correlation function rather than the usual (time-domain) cross correlation determines the MAI when the system is operated in the presence of carrier frequency offset (CFO), which arises due to the frequency-accuracy limit of the oscillator. Several known sets of sequences having optimized time-domain cross correlation are investigated for their MAI-minimization capabilities in the presence of CFO. It is found that: (i) a system using Walsh codes or Suehiro-Hatori (1985) polyphase sequences can be driven into outage as a result of significant worst-case MAI and (ii) it is possible to minimize the MAI for systems using preferentially phased Gold codes cyclic-shift m-sequences or Lin-Chang 9see ibid., vol.45, p.221-6, 1997) sequences only if the product of chip period and maximum frequency deviation is less than around 0.01. Implications of these findings to practical implementation of systems are discussed. |
| doi_str_mv | 10.1109/49.806821 |
| format | Article |
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This paper shows that the time-frequency cross correlation function rather than the usual (time-domain) cross correlation determines the MAI when the system is operated in the presence of carrier frequency offset (CFO), which arises due to the frequency-accuracy limit of the oscillator. Several known sets of sequences having optimized time-domain cross correlation are investigated for their MAI-minimization capabilities in the presence of CFO. It is found that: (i) a system using Walsh codes or Suehiro-Hatori (1985) polyphase sequences can be driven into outage as a result of significant worst-case MAI and (ii) it is possible to minimize the MAI for systems using preferentially phased Gold codes cyclic-shift m-sequences or Lin-Chang 9see ibid., vol.45, p.221-6, 1997) sequences only if the product of chip period and maximum frequency deviation is less than around 0.01. 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This paper shows that the time-frequency cross correlation function rather than the usual (time-domain) cross correlation determines the MAI when the system is operated in the presence of carrier frequency offset (CFO), which arises due to the frequency-accuracy limit of the oscillator. Several known sets of sequences having optimized time-domain cross correlation are investigated for their MAI-minimization capabilities in the presence of CFO. It is found that: (i) a system using Walsh codes or Suehiro-Hatori (1985) polyphase sequences can be driven into outage as a result of significant worst-case MAI and (ii) it is possible to minimize the MAI for systems using preferentially phased Gold codes cyclic-shift m-sequences or Lin-Chang 9see ibid., vol.45, p.221-6, 1997) sequences only if the product of chip period and maximum frequency deviation is less than around 0.01. Implications of these findings to practical implementation of systems are discussed.</description><subject>Automatic frequency control</subject><subject>Carrier frequencies</subject><subject>Circuits</subject><subject>Cross correlation</subject><subject>Frequency conversion</subject><subject>Frequency synchronization</subject><subject>Gold</subject><subject>Mobile communication</subject><subject>Multiaccess communication</subject><subject>Multiple access</subject><subject>Multiple access interference</subject><subject>Origins</subject><subject>Oscillators</subject><subject>Outages</subject><subject>Signatures</subject><subject>Time domain analysis</subject><subject>Time frequency analysis</subject><issn>0733-8716</issn><issn>1558-0008</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1999</creationdate><recordtype>article</recordtype><sourceid>RIE</sourceid><recordid>eNp9kb1PwzAQxS0EEqUwsDJ5AiGRYsd24oyoLR9SEQMwR457BqMkbu1kCH89rlIYmd7p3u_udHoInVMyo5QUt7yYSZLJlB6gCRVCJoQQeYgmJGcskTnNjtFJCF-EUM5lOkHD0hjQXcDOYK28t-Cx8bDtodUDVlr3XsXCtXjbq2CTMLT607vW9eEGN33d2d-pxWsyXzzfYe2apm9ju7OuDbgPtv3AbtPZxn7DGodxN4RTdGRUHeBsr1P0fr98mz8mq5eHp_ndKtGM8y4RWomC5YZzylTFeZWaKhWSq5SSNVTAOVdZlq21NtETNGqeiUzkAJUAmbMpuhr3bryLp0NXNjZoqGvVQvyiLGhRpIywHXn5L5nKVOREkAhej6D2LgQPptx42yg_lJSUuxhKXpRjDJG9GFkLAH_c3vwB8U-Evg</recordid><startdate>19991101</startdate><enddate>19991101</enddate><creator>Yip, Kun-Wah</creator><creator>Ng, Tung-Sang</creator><general>IEEE</general><scope>RIA</scope><scope>RIE</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7SP</scope><scope>8FD</scope><scope>L7M</scope><scope>F28</scope><scope>FR3</scope></search><sort><creationdate>19991101</creationdate><title>Effects of carrier frequency accuracy on quasi-synchronous, multicarrier DS-CDMA communications using optimized sequences</title><author>Yip, Kun-Wah ; Ng, Tung-Sang</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c344t-5ca5937f4413ab44b2fb2584a210debe444a666dccf4b251ccf765657eeb5e873</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1999</creationdate><topic>Automatic frequency control</topic><topic>Carrier frequencies</topic><topic>Circuits</topic><topic>Cross correlation</topic><topic>Frequency conversion</topic><topic>Frequency synchronization</topic><topic>Gold</topic><topic>Mobile communication</topic><topic>Multiaccess communication</topic><topic>Multiple access</topic><topic>Multiple access interference</topic><topic>Origins</topic><topic>Oscillators</topic><topic>Outages</topic><topic>Signatures</topic><topic>Time domain analysis</topic><topic>Time frequency analysis</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Yip, Kun-Wah</creatorcontrib><creatorcontrib>Ng, Tung-Sang</creatorcontrib><collection>IEEE All-Society Periodicals Package (ASPP) 1998-Present</collection><collection>IEEE Electronic Library (IEL)</collection><collection>CrossRef</collection><collection>Electronics & Communications Abstracts</collection><collection>Technology Research Database</collection><collection>Advanced Technologies Database with Aerospace</collection><collection>ANTE: Abstracts in New Technology & Engineering</collection><collection>Engineering Research Database</collection><jtitle>IEEE journal on selected areas in communications</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext_linktorsrc</fulltext></delivery><addata><au>Yip, Kun-Wah</au><au>Ng, Tung-Sang</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Effects of carrier frequency accuracy on quasi-synchronous, multicarrier DS-CDMA communications using optimized sequences</atitle><jtitle>IEEE journal on selected areas in communications</jtitle><stitle>J-SAC</stitle><date>1999-11-01</date><risdate>1999</risdate><volume>17</volume><issue>11</issue><spage>1915</spage><epage>1923</epage><pages>1915-1923</pages><issn>0733-8716</issn><eissn>1558-0008</eissn><coden>ISACEM</coden><abstract>It is known that the multiple access interference (MAI) of a quasi-synchronous (QS) multicarrier direct signal code division multiple access (DS-CDMA) system can be substantially reduced by using signature sequences having optimized cross correlation at small shifts around the origin. This paper shows that the time-frequency cross correlation function rather than the usual (time-domain) cross correlation determines the MAI when the system is operated in the presence of carrier frequency offset (CFO), which arises due to the frequency-accuracy limit of the oscillator. Several known sets of sequences having optimized time-domain cross correlation are investigated for their MAI-minimization capabilities in the presence of CFO. It is found that: (i) a system using Walsh codes or Suehiro-Hatori (1985) polyphase sequences can be driven into outage as a result of significant worst-case MAI and (ii) it is possible to minimize the MAI for systems using preferentially phased Gold codes cyclic-shift m-sequences or Lin-Chang 9see ibid., vol.45, p.221-6, 1997) sequences only if the product of chip period and maximum frequency deviation is less than around 0.01. Implications of these findings to practical implementation of systems are discussed.</abstract><pub>IEEE</pub><doi>10.1109/49.806821</doi><tpages>9</tpages><oa>free_for_read</oa></addata></record> |
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| source | IEEE Electronic Library (IEL) |
| subjects | Automatic frequency control Carrier frequencies Circuits Cross correlation Frequency conversion Frequency synchronization Gold Mobile communication Multiaccess communication Multiple access Multiple access interference Origins Oscillators Outages Signatures Time domain analysis Time frequency analysis |
| title | Effects of carrier frequency accuracy on quasi-synchronous, multicarrier DS-CDMA communications using optimized sequences |
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