Filter bank and receiver for processing continuous phase modulated signals
AssigneeMotorola, Inc.
InventorsYunxin Li, Xiaojing Huang
Life of this patent
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Abstract
A filter bank (10) and receiver including the filter bank (10) that is designed for processing a baseband signal of a received continuous phase modulated signal S(t) with an integer modulation index. The filter bank (10) has outputs for providing a plurality of decision variable values (d1,d2,d3,d4) each representing a likelihood value of a symbol, from a group of predefined symbols that are likely to be present in the continuous phase modulated signal S(t). The filter bank 10 has filter units (12,14,16,18) each having an impulse response determined by a complex main pulse containing a majority of signal energy of one of the predefined symbols that is likely to be in the continuous phase modulated signal S(t).
Claims17
A filter bank for processing a baseband signal of a received continuous phase modulated signal with an integer modulation index, the filter bank having filter bank outputs coupled to a decision module, said filter bank outputs providing a plurality of decision variable values each representing a likelihood value of a symbol, from a group of predefined symbols that are likely to be present in the continuous phase modulated signal, said filter bank having filter units each having an impulse response determined by a complex main pulse containing a majority of signal energy of one of the predefined symbols that is likely to be in the continuous phase modulated signal, and wherein in use the decision module processes the decision variable values to provide a symbol at the output thereof, the symbol being one of the group of predefined symbols.
A receiver for receiving a continuous phase modulated signal with an integer modulation index, the receiver comprising:
- a filter bank for processing a baseband signal of the continuous phase modulated signal, the filter bank having filter bank outputs for providing a plurality of decision variable values each representing a likelihood value of a symbol, from a group of predefined symbols that are likely to be present in the continuous phase modulated signal, said filter bank having filter units each having an impulse response determined by a complex main pulse containing a majority of signal energy of one of the predefined symbols that is likely to be in the continuous phase modulated signal;
- and
- a decision module having inputs coupled to the filter bank outputs, wherein in use the decision module processes the decision variable values to provide a symbol at the output thereof, the symbol being one of the group of predefined symbols, and wherein the decision module provides the symbol for non-coherent demodulation based on a largest value of the decision variables.
Dependencies are inferred from the claim text.