[특허]Phase equalizer for TDMA portable radio systems

Phase equalizer for TDMA portable radio systems 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H03H-007/30
출원번호	US-0695524 (1991-05-03)
발명자 / 주소	Ariyavisitakul Sirikiat (Eatontown NJ) Arnold Hamilton W. (Middletown NJ)
출원인 / 주소	Bell Communications Research (Livingston NJ 02)
인용정보	피인용 횟수 : 36 인용 특허 : 0

초록 ▼

A receiver for use in the port or portable units in a TDM/TDMA digital radio communications system is disclosed which incorporates an equalizer (107) to compensate for channel distortion due to multipath delay spread. Each received burst of information is oversampled at a multiple of the symbol rate and stored in a buffer memory (105). A joint estimator (106) processes the stored burst by operating on a known training sequence of bits within the burst to determine burst timing (where the burst actually begins) and the symbol timing (the optimum sample sample per oversampled symbol to be used for detection purposes). The estimator also determines whether the stored burst should be processed in a time-forward or time-reversed order. The joint estimator includes plural training equalizers (201), each of which is associated with an assumed burst location and each of which attempts to converge on the known training sequence as the stored sequence is circulated plural times through the equalizers in both the time-forward and time-reversed order. Burst and symbol timing and the optimum processing order are determined from the location of the training equalizer which converges with the minimum mean-square error. The determined burst and symbol timing, and the selected processing order, are passed to the buffer storage for read-out, in that selected order, of the stored burst information in that order to the input of the main receiver equalizer (107). That main equalizer is initially set with the equalizer parameters determined by the training equalizer yielding the minimum mean-square error. The equalizers can either be conventional fractionally-spaced decision feedback equalizers or can be phase equalizers, which operate on the received phase angle.

대표청구항 ▼

In a TDM/TDMA digital radio communications system which transmits by a transmitter and receives by a receiver bursts of phase-shift-keyed symbols between ports and portable units over a transmission channel wherein each transmitted burst includes a segment of data symbols and an embedded training sequence segment of symbols which are known to the transmitter and the receiver and wherein the symbols are transmitted as phase angles representing the symbols, apparatus in the receiver at a port or a portable unit for detecting the transmitted symbols from the phase angles of the received signal samples in the burst comprising: means for detecting the phase angles of each received signal sample in a burst; means for storing the detected phase angles of the received signal samples in the burst; means for processing the detected phase angles within the the training sequence segment of the stored burst comprising: means for comparing the detected phase angles of the received signal samples within the training sequence segment of the stored burst with the phase angles representing the known transmitted sequence of symbols; means for estimating a phase shift due to intersymbol interference (ISI) for each possible relationship between a current transmitted symbol and at least one previously transmitted symbol from the phase comparisons between the detected phase angles within the training sequence of the stored burst and the known transmitted sequence of symbols; and means for estimating a carrier phase shift for the stored burst from the comparisons between the detected phase angles within the training sequence of the stored burst and the known transmitted training sequence; and means for processing the detected phase angles within the data segment of the stored burst comprising: means using at least one previously detected symbol for determining for each one of the possible current symbols, its expected phase angle as it is corrected by the carrier phase shift and the phase shift due to ISI that is associated with the particular phase relationship between the possible current symbol and the at least one previously detected symbol, said carrier phase shift being estimated by said means for estimating a carrier phase shift and said phase shift due to ISI being estimated by said means for estimating the phase shift due to ISI; means for calculating the phase differences between the stored detected phase angles of the current symbol and the expected phase angle for each possible current symbol as each is corrected by the carrier phase shift and the phase shift due to ISI; and means for detecting the current transmitted symbol as that one of the possible current symbols having the minimum calculated phase difference.

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IPC	Description
A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

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Phase equalizer for TDMA portable radio systems 원문보기

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Phase equalizer for TDMA portable radio systems 원문보기

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