11 Questions 17 Answers 0 Followers
Questions related from Jiajun Zhu
Hi all, I am designing a loop filter of DPLL in 802.11ac OFDM system. The DPLL tracking is achieved by pilot symbols inserted into OFDM symbols. Importantly, the coefficients of loop filter...
02 February 2016 3,904 3 View
As for linear ZF or MMSE detector, the coefficient of soft output is that symbol power over symbol interference power plus white noise power. As for non-linear ZF-SIC or MMSE-SIC detector, the...
10 October 2015 368 4 View
I am working for a semi-conductor company. Now, my assignment is to design IEEE802.11ac PHY layer algorithm. However, the situation of theoretical simulation is very different from that of...
05 May 2015 935 8 View
The reference I've read indicates that the minimum training frames should be greater or equal to the number of transmitter antennas. Herein, the training frames denote that S = [s1, s2, s3, ......
11 November 2014 409 7 View
DS-CDMA is divided into uplink and downlink communications. As for uplink, the users suffer from different channel impulse responses (CIRs). How the receiver estimates these CIRs and cancel it? As...
09 September 2014 9,414 9 View
As for training sequence, we can use the known simples to estimate the channel and then cancel ISI. However, in reality, there are not only frequency-selective channel but also carrier frequency...
09 September 2014 7,307 12 View
I am modelling an equaliser trained by linear RLS and LMS in a simple BPSK modulation system. I found a problem that, the short length of equaliser, (e.g. equal to length of CIR), is not able to...
09 September 2014 6,740 12 View
PBCC is an optional modulation scheme using a binary convolutional coding with 64-state binary convolutional code (BCC) and cover sequence. If the cover sequence is 0, one constellation is used....
08 August 2014 6,124 2 View
My question is about CCK modulation scheme in IEEE 802.11b standard. CCK uses 8 complex polyphase complementary codes to represent a particular 8-bit sequence and achieve 8 chips per symbol. In...
08 August 2014 6,404 4 View
I wanna to establish a inverse modelling to get a equalizer to combat the multipath channel. However, I found a problem that the training of LMS algorithm is very unstable under the Rayleigh...
08 August 2014 3,712 19 View
I am engaging in a project of Bluetooth Modem design. I found a problem about the channel selection in the low-IF (1MHz ). Compared to GFSK, both DQPSK and D8PSK, in which symbol rate is 1MHz,...
04 April 2014 2,514 0 View
