DSP algorithms for carrier and timing recovery

用于载波和定时恢复的 DSP 算法

• 批准号: 4072-2006
• 负责人: Salt, Joseph
• 金额: $ 1.38万
• 依托单位: University of Saskatchewan
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2006
• 资助国家: 加拿大
• 起止时间: 2006-01-01 至 2007-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=338857
• 关键词: DSP; algorithms; carrier; timing; recovery

The general objective of the applicant's research is to increase the rate at which digital information can be communicated over analog media like twisted pair, coaxial cable, optical fiber and radio  channels. Examples of where  digital information is sent over an analog channel are cellular telephone, digital TV and the internet. Unfortunately, digital data can not be sent directly over an analog medium. It must be converted to an analog signal that is suitable for transmission. The device that converts the digital data to appropriate analog signal and visa versa is called a modem.   The operation of a receiving modem is quite complex, but it basically has three parts. The first part samples the incomming analog signal and changes the continuous analog signal into a sequence of numbers. The sampling rate is usually quite high, for example this part of the modem could convert the analog signal into stream of 20 million numbers per second. The second part of the modem is critical and requires sophistacted processing. It must synchronizes a clock in receiving modem to the clock that was used in the transmitting modem. It does this by analysing the stream of numbers.  The third part of the modem uses the synchonized clock to help decipher the stream of numbers and reconstruct the digital data that was sent by the transmitter. The applicant is interested in the second part of the modem. The intent is to find a faster and yet cheaper way to synchronize the clock in the receiver modem to the clock in the transmitter modem.  In doing so, modems could communicate over analog channels at higher information rates and at a lower cost.

申请人的研究的总体目标是提高数字信息可以通过模拟介质（如双绞线、同轴电缆、光纤和无线电信道）进行通信的速率。通过模拟信道发送数字信息的示例是蜂窝电话、数字电视和互联网。不幸的是，数字数据不能直接通过模拟介质发送。必须将其转换为适合传输的模拟信号。将数字数据转换为适当的模拟信号或反之的设备称为调制解调器。 接收调制解调器的操作相当复杂，但它基本上有三个部分。第一部分对输入的模拟信号进行采样，并将连续的模拟信号转换成一个数字序列。采样率通常相当高，例如调制解调器的这一部分可以将模拟信号转换为每秒2000万个数字的流。调制解调器的第二部分是关键的，需要sophistacted处理。它必须使接收调制解调器中的时钟与发送调制解调器中使用的时钟同步。调制解调器的第三部分使用同步时钟来帮助破译数字流，并重建发射机发送的数字数据。申请人对调制解调器的第二部分感兴趣。其目的是找到一种更快、更便宜的方法来同步接收机调制解调器中的时钟和发送机调制解调器中的时钟，这样，调制解调器就可以在模拟信道上以更高的信息速率和更低的成本进行通信。