相對(duì)時(shí)延對(duì)ST-FSK系統(tǒng)性能的影響
On the Performance of ST-FSK Systems in the Presence of Relative Delay
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摘要: 空時(shí)頻移鍵控(ST-FSK)結(jié)合了空時(shí)分組碼和頻移鍵控的優(yōu)點(diǎn)，在瑞利衰落信道條件下無(wú)需信道信息，可采用非相干的最大似然(ML)檢測(cè)器。該文推導(dǎo)了在接收端已知相對(duì)時(shí)延條件下的非相干ML判決度量，討論了在接收端未知相對(duì)時(shí)延條件下信噪比與二進(jìn)制、四進(jìn)制ST-FSK系統(tǒng)誤比特率性能的關(guān)系。理論和仿真結(jié)果都表明：(1)低信噪比弱化了相對(duì)時(shí)延對(duì)ST-FSK系統(tǒng)可靠性的影響，但在高信噪比條件下相對(duì)時(shí)延會(huì)嚴(yán)重制約系統(tǒng)性能；(2)相對(duì)時(shí)延對(duì)系統(tǒng)性能的影響與系統(tǒng)進(jìn)制數(shù)的關(guān)系不大。Abstract: Combining the advantages of space-time block codes and frequency-shift keying, space-time frequency-shift keying (ST-FSK), which does not require any channel state information at the transmitter and the receiver, can adopt the noncoherent ML detector under the Rayleigh fading channels. The paper deduces the noncoherent ML decision metric at the receiver with the knowledge of relative delay, and for the different SNRs it discusses the performance of binary and quaternary ST-FSK systems in the presence of distinct relative delay. Both theoretical analysis and simulation results show that, (1) lower SNR lessens the relative delay sensitivity of ST-FSK systems, but the relative delay sensitivity limits the systems performance for higher SNR; (2) the sensitivity makes little difference between binary and quaternary ST-FSK systems.
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