Heterodyne filters provide both tunable and adaptive filters with applications in narrow-band interference attenuation for spread-spectrum and other broad-hand communications systems. A new complex-arithmetic version of the tunable heterodyne filter offers significant hardware savings over previous versions and can more easily he implemented in adaptive filter applications.

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A novel pipelined recursive modified Euclidean (ME) algorithm block for the low-complexity, high-speed Reed-Solomon (RS) decoder is presented. The deeply pipelined recursive structure enables implementation of a significantly low-complexity ME algorithm block with much improved clock frequency. The low-complexity, high-speed RS decoder using the pipelined recursive ME algorithm block has been implemented in 0.13 mm CMOS technology with a supply voltage of 1.1 V. The results show that it has significantly low hardware complexity and a high data processing rate of 6.16 Gbit=s.

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