摘要:
In a method and apparatus for maintaining a minimum transmission power level between two communication stations, each station measures the other's received signal quality, and returns an indication of signal quality as part of a regular maintenance burst. Each station adjusts its own transmission power level based on the returned signal quality indication. The signal quality indication is based on the received ratio of bit energy to total noise power spectral density which is calculated from an estimated bit-error-rate.
摘要:
A time-framed communications transceiver maintains synchronization through fade conditions by resetting a counter (640) whenever new synchronization parameters are stored in a memory (630) based on bursts detected by a receiver (610) and a burst synchronizer (620). A transmitter (690) transmits bursts based upon the synchronization parameters in the memory (630) when the time counter (640) has not exceeded a predetermined period of time. The receiver (610) re-establishes the synchronization parameters in the memory (630) when the time counter exceeds another, longer predetermined period of time before transmission by the transmitter (690).
摘要:
A decoding apparatus (200) decodes a coherent, differentially encoded multi-level phase shift keying (DEPSK) modulated signal. A coherent receiver (101) receives and, subsequently, outputs the coherent DEPSK modulated signal to a metric computer (201). The metric computer (201) generates a soft decision metric .LAMBDA.(s(n)) corresponding to the coherent DEPSK modulated signal which is outputted to a forward error correction (FEC) decoder (107). The FEC decoder (107) decodes the coherent DEPSK modulated signal in accordance with the soft derision metric .LAMBDA.(s(n)) corresponding to the coherent DEPSK modulated signal.
摘要翻译:解码装置(200)对相干,差分编码的多电平相移键控(DEPSK)调制信号进行解码。 相干接收机(101)接收并随后将相干的DEPSK调制信号输出到公制计算机(201)。 度量计算机(201)生成与前向纠错(FEC)解码器(FEC)解码器输出的相干DEPSK调制信号相对应的软判决度量+ E,cir LAMBDA + EE(+ E,ot1 s + EE(n) 107)。 FEC解码器(107)根据与相干DEPSK调制信号相对应的软¡der metric + + ir LAMBDA + EE(s(n))对相干DEPSK调制信号进行解码。