What are the considerations for fixed-point DSP implementation?

Fixed-point considerations: Word length selection (bits for coefficients, data, accumulator), Overflow handling (saturation vs wrap-around), Quantization effects (coefficient quantization affects filter response, signal quantization adds noise), Scaling strategy (prevent overflow while maximizing dynamic range), and Precision analysis (error propagation, limit cycles in IIR). Analysis: Fixed-point simulation, comparison with floating-point reference, SNR measurement. Techniques: Block floating-point, guard bits, double-precision accumulator, and careful coefficient scaling. Trade-offs between hardware cost (fewer bits) and performance (more bits). Use tools like MATLAB Fixed-Point Designer for analysis.