As a necessary input parameter for MAP decoding algorithm, SNR was normally obtained from the channel estimation unit.
作为MAP译码算法的必要参数，信噪比通常通过信道估计单元得到。
The parameter estimation of the signal propagating channel in CDMA systems is a key technology, which involves estimation of amplitude and delay of signal propagating channels.
信道估计是CD MA系统中的关键技术，涉及到对用户信号传播信道的幅度、相位和延时的估计。
Especially in the transmitting antenna correlated parameter unknown circumstances, an innovational channel estimation algorithm which takes use of the long & shot training sequence is proposed.
尤其在发射天线相关参数未知情况下，本文创新性地提出了一种利用长训练序列和短训练序列进行联合信道估计的算法。
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