Patent ID: 8953563
Filing Date: 2015-02-10
Classification: H04J

Abstract:
1. A base station comprising: a reference signal sequence generator configured to generate a reference signal sequence for each of n antenna ports using one initialization seed, n being a positive integer; n spreaders, each spreader corresponding to the respective one of the n antenna ports and configured to receive a respective reference signal sequence for the respective antenna port from the reference signal sequence generator and spread the respective reference signal sequence using a respective Walsh code; and n resource element mappers, each mapper corresponding to the respective one of the n antenna ports and configured to receive a respective spread reference signal sequence from a respective spreader and map the respective spread reference signal sequence to a set of reference signal resource elements corresponding to a respective antenna port, wherein the reference signal sequence generator comprises: a pseudo-random sequence generator configured to generate a pseudo-random sequence from the one initialization seed; a scrambling sequence generator configured to receive the pseudo-random sequence and generate a scrambling sequence from the pseudo-random sequence; and a sequence splitter configured to receive the scrambling sequence and generate n reference signal sequences for each of the n antenna ports from the scrambling sequence by diving the scrambling sequence into n subsequences.