TDMA和CDMA的区别

1. 时分多址(TDMA)：
TDMA 是信道化协议，其中信道带宽按时间划分到各个站点。每个站点都有一个时隙，站点只能在该时隙内传输数据，如下所示：

每个站必须知道其时隙的开始和时隙的位置。 TDMA 需要不同站之间的同步。它是数据链路层中的一种访问方法。在每个站点，数据链路层告诉站点使用分配的时隙。

2. 码分多址(CDMA)：
在CDMA中，所有站点可以同时传输数据。它允许每个站点始终在整个频率上传输数据。多个同时传输由唯一的代码序列分隔。每个用户都分配有唯一的代码序列。

在上图中，有4个站点标记为1、2、3和4。数据分配给各个站点为d ₁ 、d ₂ 、d ₃和d ₄ ，分配给各个站点的代码为c ₁ 、c ₂ ， c ₃和 c ₄ 。

TDMA和CDMA的区别：

S. No.	TDMA	CDMA
1.	TDMA stands for Time Division Multiple Access.	CDMA stands for Code Division Multiple Access.
2.	In this, only the sharing of time of satellite transponder takes place.	In this, there is sharing of both i.e. bandwidth and time among different stations takes place.
3.	There is no need of any codeword.	There is no need of any codeword.
4.	In this, guard time of the adjacent slots are necessary.	In this, both guard bands and guard time are necessary.
5.	Synchronization is required.	No need of synchronization.
6.	There is average capacity of the system.	There is large capacity of the system.
7.	It is less flexible than CDMA.	Flexibility is high.
8.	In this, there is no Near-far problem.	There is existence of Near-far problem.
9.	Rate of data is average.	Rate of data is high.