kaira.modulations.OQPSKModulator

Inheritance diagram for OQPSKModulator

class kaira.modulations.OQPSKModulator(normalize: bool = True, *args, **kwargs)

Bases: BaseModulator

Offset Quadrature Phase-Shift Keying (OQPSK) modulator.

Similar to QPSK but with a half-symbol delay in the quadrature component, which results in only single-bit transitions and improved spectral properties.

Methods

__init__	Initialize the OQPSK modulator.
forward	Modulate bit pairs to OQPSK symbols.
plot_constellation	Plot the OQPSK constellation diagram.
reset_state	Reset internal state (delayed quadrature value).

Attributes

bits_per_symbol	Number of bits per symbol.
constellation
bit_patterns

constellation: Tensor

bit_patterns: Tensor

__init__(normalize: bool = True, *args, **kwargs) → None

Initialize the OQPSK modulator.

Parameters:

• normalize – If True, normalize constellation to unit energy

• *args – Variable length argument list.

• **kwargs – Arbitrary keyword arguments.

forward(x: Tensor, *args, **kwargs) → Tensor

Modulate bit pairs to OQPSK symbols.

Parameters:

• x – Input tensor of bits with shape (…, 2*N)

• *args – Variable length argument list.

• **kwargs – Arbitrary keyword arguments.

Returns:

Complex tensor of OQPSK symbols with shape (…, N)

Note

For simplicity, this implementation models the offset by applying the delay at the symbol level rather than at the pulse shaping level, which would be done in a real system.

reset_state() → None

Reset internal state (delayed quadrature value).

plot_constellation(**kwargs) → Figure

Plot the OQPSK constellation diagram.

Parameters:

**kwargs – Additional arguments passed to plot_constellation

Returns:

Matplotlib figure object

property bits_per_symbol: int

Number of bits per symbol.