一種新的正交多載波CDMA系統(tǒng)
A NEW ORTHOGONAL MULTICARRIER CDMA SYSTEM
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摘要: 該文提出了一種新的多載波碼分多址(MC-CDMA)系統(tǒng)。與傳統(tǒng)的MC-CDMA系統(tǒng)相比,其主要區(qū)別是要發(fā)送的數(shù)據(jù)比特先串并轉換為多個并行分支,每一個分支用一組正交子載波進行調制。在每個分支上,使用相同擴頻序列的不同碼片調制子載波。這種系統(tǒng)能更有效地利用傳輸帶寬,實現(xiàn)頻率分集。由于該系統(tǒng)降低了每個子載波上的數(shù)據(jù)速率,擴頻序列更容易同步。最后給出了在瑞利衰落信道下的性能分析。
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關鍵詞:
- 多載波; 碼分多址; 瑞利衰落
Abstract: In this paper, a new multicarrier MC-CDMA system is proposed. Comparing with the conventional MC-CDMA system, the difference is that transmitted data bits are serial to parallel converted to a number of parallel branches first, then each branch is modulated using a group of orthogonal subcarriers. Noted that on each orthogonal subcarrier branch, transmitted data bit after serial to parallel converted is modulated with a chip of a PN(Pseudorandom Number) sequence, not a whole PN sequence. This system can utilize the transmission bandwidth more efficiently and achive frequency diversity. Furthermore, this system lowers the data rate of each carrier branch, so it is easier to make PN sequence synchronized. The performance of the system is analysed in a Rayleigh fading channel. -
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