본 논문에서는 수신기에서 채널 추정을 필요로 하지 않는 MWSK (M-ary orthogonal Walsh sequence keying)를 적용한 ST-MWSK (space-time MWSK)를 제안한다. ST-MWSK의 noncoherent ML (maximum-likelihood) 검출기의 계산 복잡도는 기존의 ST-FSK (ST frequency-shift keying) 방식에 비해 크게 줄어든다. 또한 ST-MWSK는 ST-FSK와 거의 동일한 성능을 나타낸다.
In this paper, we propose ST-MWSK (space-time M-ary orthogonal Walsh sequence keying) employing MWSK which does not require channel estimation at the receiver. The computational complexity for the noncoherent ML (maximum-likelihood) detector of ST-MWSK is significantly reduced compared to that of ST-FSK (ST frequency-shift keying). Also, the performance of ST-MWSK is virtually identical to that of ST-FSK.
