A pair of asymmetric weighting receivers and polyphase codes for efficient aperiodic correlations

Sequences with low autocorrelation levels are highly desirable in digital communication. Conventional sidelobe reduction techniques have suffered from performance degradations in range resolutions and signal-to-noise ratio (SNR) gains. In this paper we propose a way to synthesize amplitude weight correlators for polyphase codes. These weighted codes generate sidelobes that are lower than those found in Barker codes. The sidelobe level is kept uniformly flat over all time delays while the range resolution loss is prevented. Unlike the Barker codes, the proposed technique is not limited by the code length. The technique is easy to implement and incurs a minimal SNR loss.