| 摘要 |
本发明提供一种用于交错式子载波配置频谱预编码式正交分频多重存取系统之传输端电路，包括：一资料产生器、一关联式频域预编码器、一子载波分配器以及一正交分频多工调变器。该关联式频域预编码器以其预编码矩阵G做为特征，明确的说，预编码矩阵G为一具有关联性频宽(correlative bandwidth)B的下三角(lower triangula)带矩阵(band matrix)。当该传输端电路符合一单一使用者正交分频多重存取传输协定时，该传输讯号s(t)之基频段功率密度函数S(f)可表示为：其中，Zu是频率f的线性函数，和预编码矩阵G有关；当该预编码矩阵G满足一限制条件：对于所有的m{0,1,...,M-1}，k{0,1,...,L-1}，；而对某些m，，则S(f)可进一步表示为：其中，频谱系数△k可表示为由上式可看出该传输端电路发出之OFDMA讯号具有以f -2L-2 速率衰减之频谱旁波(Spectral Sidelobe)，更进一步地，本发明设计之关联式频域预编码器其预编码矩阵G不但满足上面的限制条件，并能使频谱系数△k的主频谱系数△0之值为最小，因此能提供比知关联式频域预编码器更好的压抑频谱旁波能力。;本发明提供另一种传输端电路，包括：一资料产生器、一正交式频域预编码器、一子载波分配器以及一正交分频多工调变器。传输端电路具有复数个子预编码矩阵G1~GL，且满足限制条件，对于所有的l{1,2,…,L}，其中el=[0 l ,1 l ,...,,(P-1) l ] t ；则该传输端电路发出之符合OFDMA协定之该传输讯号s(t)具有小于或等于f -2L-2 之旁波衰减速率，其中L为正整数。; When the precoding matrix satisfies the condition:m{0,1,...,M-1},k{0,1,...,L-1} for allm,or for otherm, wherein the spectral coefficient △krepresents to ;According to the spectral coefficient △k, the transmission circuit has a sidelobe decaying rate with f -2L-2 . Furthermore, the correlative spectral precoder mot only satisfies the above condition so that the dominant spectral coefficient △0of the spectral coefficient △kis minimum but also it provides better effects for suppressing the sidelobe than the traditional correlative spectral precoder. ;Another transmission circuit for spectrally precoded orthogonal frequency division multiple access with interleaved subcarrier allocation includes a data generator, an orthogonal spectral precoder, a subcarrier allocator, and an OFDM modulator. The transmission circuit includes a plurality of sub-precoding matricesG1~GL, which satisfy a conditio n:for all l{1,2,...,L}, wherein el=[0 l ,1 l ,...,,(P-1) l ] t ; the transmission circuit has a sidelobe decaying rate smal ler than or equal tof -2L-2 , whereinLis an integer. |
