Diversity reception method and device based on synchronization sequence

Abstract

The invention discloses a diversity reception method based synchronous sequence. Radio signal frame has at least two continuous synchronous sequences. For each branch there are sliding related step, delay step, conjugate multiplication step, step of computing diversity detection value and outputting diversity detection signal. Comparing diversity detection signal of each branch, maximum value branch is selected as diversity output branch. The invention overcomes deficiency of existing technology of complex computation, long-time delay for antenna switch, high error rate, provides a simplifieddiversity reception method for timingly switching diversity antenna, effectively resisting multi-path fading and doppler effect, improving error rate property, which can be widely used in wireless mobile communication field.

Description

technical field [0001] The present invention relates to a diversity system and method, in particular to a diversity system and method at a receiving station. Background technique [0002] In mobile communication, multi-antenna diversity reception is often used. Multi-antenna diversity reception is to keep multiple receiving antennas at a certain distance in space, and each antenna receives independent and independent multi-channel signals, and separates these multiple channels. The energy of the signal is combined according to certain rules to maximize the energy of the received useful signal, thereby improving the signal-to-noise power ratio at the receiving end, and for digital signals, the bit error rate is minimized. Commonly used merging methods include selective merging, maximum ratio merging, and equal gain merging. The selective combination is to select the signal of the branch with the highest signal-to-noise ratio or the lowest bit error rate as the output signal....

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Problems solved by technology

[0006] Selective combined diversity reception based on received signal level needs to calculate SNR instantaneously, and actually uses (S+N) / N instead of SNR, without considering channel fading, and the effect of resisting signal multipath fading and Doppler frequency shift is relatively poor Difference

[0007] Although the channel estimation-based selective combining diversity reception technology uses channel estimation to resist channel fading, the current wireless communication signals mostly use pilot signals for channel estimation, resulting in complex system calculations, large delays in antenna switching, and high bit error rates.

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