Recently, a block spreading code division multiple access (BS-CDMA) technique was presented whereby user-specific preceding along with orthogonal spreading codes are used to achieve multi-user interference (MUI) free when all users arrive at the base station simultaneously. In practice however, imperfect synchronization destroys the orthogonality among users and MUI occurs. This paper investigates the design of linear frequency domain equalizers to reduce the MUI in a quasi-synchronous BS-CDMA system. An optimal frequency domain linear minimum-mean squared error (LMMSE) equalizer is derived. Further simplification leads to a novel sub-optimal equalizer with reduced computational complexity. It is shown through simulation that the proposed equalizers effectively suppress the error floor due to quasi-synchronous reception when channel coding is applied.
|Translated title of the contribution||Linear equalizers for quasi-synchronous block spreading CDMA systems|
|Title of host publication||IEEE Global Telecommunications Conference, 2009 (GLOBECOM 2009), Honolulu|
|Publisher||Institute of Electrical and Electronics Engineers (IEEE)|
|Pages||1 - 6|
|Number of pages||6|
|Publication status||Published - Nov 2009|
|Event||Global Telecommunications Conference, 2009 - Honolulu, HI, United States|
Duration: 1 Nov 2009 → …
|Conference||Global Telecommunications Conference, 2009|
|Abbreviated title||GLOBECOM 2009|
|Period||1/11/09 → …|
Bibliographical noteRose publication type: Conference contribution
Global Telecommunications Conference 2009 (GLOBECOM 2009).
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- block spreading