Device and method for precoding data signals for PCM transmission

  • US 6,198,776 B1
  • Filed: 12/29/1997
  • Issued: 03/06/2001
  • Est. Priority Date: 11/13/1996
  • Status: Expired due to Term
First Claim
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1. A transmitter which defines an equivalence class at the input of a quantization device for precoding a sequence of analog levels to be transmitted over an analog channel to said quantization device, the precoded sequence forming the input to the quantization device, comprising:

  • a precoder including a mapping device for mapping data bits to be transmitted to as a sequence of equivalent classes, wherein each equivalence class contains one or more constellation points; and

    a constellation point selector interconnected to the mapping device which selects a constellation point in each equivalence class to represent the data bits to be transmitted and which transmits a level that produces the selected constellation point to an input of the quantization device.

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