Adaptively receiving digital television signals transmitted in various formats
AssigneeSamsung Electronics Co., Ltd.
InventorsChandrakant B. Patel, Allen LeRoy Limberg
Life of this patent
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Abstract
Methods for operating an adaptive receiver for receiving a selected DTV signal, which can be either a quadrature-amplitude-modulation (QAM) signal or a vestigial sideband (VSB) signal. The adaptive receiver includes adaptive symbol decoding circuitry for adaptively decoding baseband signal encoded in different signal formats at selected different code rates to provide a decoded output signal, an adaptive deinterleaver for deinterleaving the decoded output signal in accordance with a deinterleaving function selected from a plurality of deinterleaving functions, and an adaptive error decoder for detecting and correcting errors in the deinterleaver output signal.
Claims38
A method of receiving a wideband digital modulation signal transmitted through a communication channel in accordance with one of various transmission standards for digital television signal, a first of said transmission standards specifying a single carrier with a particular form of digital quadrature amplitude modulation and a second transmission standard specifying another type of digital amplitude modulation that is different from said particular form of digital quadrature amplitude modulation of said single carrier, said method comprising the steps of:
- receiving said digital modulation signal, as transmitted on a radio-frequency carrier;
- translating said digital modulation signal in frequency to an intermediate-frequency band close to zero frequency;
- determining which of respective modulation formats specified for said digital modulation signal by said various transmission standards is used in received signal, to supply an indication specifying the transmission standard being employed for transmitting said digital modulation signal;
- in order to produce baseband symbol coding, demodulating said digital modulation signal as translated to said intermediate-frequency band close to zero frequency, according to a demodulation format that is suitable for demodulating the modulation format of the transmission standard that said indication specifies is being employed for transmitting said digital modulation signal;
- and
- further processing said baseband symbol coding produced by demodulating said digital modulation signal according to a demodulation format that is suitable for demodulating the modulation format of the transmission standard said indication specifies is being employed for transmitting said wideband digital modulation signal.
A method of receiving a wideband digital modulation signal transmitted through a communication channel in accordance with one of various transmission standards for digital television signal, a first of said transmission standards specifying a single carrier with a particular form of digital quadrature amplitude modulation and a second transmission standard specifying another type of digital amplitude modulation that is different from said particular form of digital quadrature amplitude modulation of said single carrier, said method comprising the steps of:
- receiving said digital modulation signal, as transmitted on a radio-frequency carrier;
- translating said digital modulation signal in frequency to an intermediate-frequency band close to zero frequency;
- determining which of respective modulation formats specified for said digital modulation signal by said various transmission standards is used in received signal, to supply an indication specifying the transmission standard being employed for transmitting said digital modulation signal;
- demodulating said digital modulation signal as translated to said intermediate-frequency band close to zero frequency, according to each demodulation format that is suitable for demodulating the modulation format of one of said various transmission standards for digital television signal, to produce a plurality of demodulation results;
- and
- selecting for further processing the one of said plurality of demodulation results from demodulating according to the demodulation format that is suitable for demodulating the modulation format of the transmission standard said indication specifies is being employed for transmitting said digital modulation signal.
Dependencies are inferred from the claim text.